I live in south africa. The water temperature where the sharks have moved to are actually warm. It's normally tiger shark and bull shark territory. No seals. Great video
@@PoetofHateSpeechthey're fully capable of doing so. Warm blooded mackerel sharks are faster and have more stamina than requiem sharks. Great whites are known to eat large bronze whalers and dusky sharks that got hooked on fishing lines.
I'm not sure to be honest. It's not unheard-of to find great whites in the natal area but it's certainly not the norm. Warm Mozambiquen current runs past there where as cold Benguela current flows in the Cape thus the seals. Will be interesting to see what will happen. Especially with the seal populations in the cape having 1 less predator
Port & Starboard were spotted in Plett about two months ago and it`s believed they move up and down the southern coast between Cape Town and the Garden Route.
The same thing happened off California a few years ago. They filmed orcas killing a white shark, and the sharks just left the area. It lasted for about a year and then they returned, but I think it's happened a couple of more times since then, and always after orcas are spotted hunting them. My guess is this has been happening for far longer than we have been observing and is just natural.
Yep I agree. 2 Apex predators with 1 primary food source being marine mammals. It’s highly likely this scenario & relationship between them has existed for a long time. Just like when it was reported that the Orcas had “learned” how to place GWs into the tonic immobility. They’ve likely done this for many many years & it was simply the first time We observed it as humans. Cool stuff.
I work as a Shark Spotter in Plettenberg and I must say I’m happy the GW’s are back and we are here to make sure no more attacks occur ❤❤They play an important role
I’m from the east coast of South Africa and I can definitely say we have had a marked increase in white shark activity. They were always there before and we have had the odd fatal attack over the years but nothing like the recent activity. There are some particularly aggressive white sharks lurking around certain areas and I know of spear fishermen having a really hard time with them. There are no seals in the warmer waters so it makes sense that the sharks are looking for alternatives.
@@chrisbennett6260kwazulu natal / durban and the East cost has great water temp, much warmer water - no need for wetsuits, can wear just board shorts. Shark attacks are very rare, hardly ever happens
@@chrisbennett6260 Yeah swimming is fine , the beaches are safe and there are lifeguards. The water is plenty warm in summer, gets a little chilly in winter though. If you are further up the coast in Durban then its warm all year round and there are shark nets. The beers are always cold :)
Thanks for the shout out Kristian and great video! I don't know if the orcas will necessarily follow the white sharks east, the waters that side are much warmer, sub-tropical and even up to tropical, so I suppose it depends on whether these orcas like it hot or cold! I do hope the sharks can find some refuge though. Another worrying thing is that up in Kwazulu-Natal there are lethal shark measures - nets and drumlines, so as the sharks move east there's a higher chance of them getting killed which is super worrying.
Can’t be that shocked that they moved away from the danger zone given, if I remember correctly, some research into shark repellent was based on the chemical being released into the water when a shark died from an attack that was like a warning to others. If I’m remembering. This correctly one would guess that the potential number of times that Port & Starboard attacked that the constant release of such a chemical signal would dictate a natural instinct to leave an area and that only thing to really be determined would be just how far that distance away was and what direction it was in. Glad to see they’ve been found and of course now a whole new bunch of questions to be answered based on their presence in these waters in greater numbers will keep researchers busy for years to come.
Yes there was a documentary I think it was around Mexico and a particular island they used to reside and mate but then moved on because of the Orca attacks. I remember this from years ago.
I have read too, that some of the larger white sharks in South Africa, have been tracked heading across and down around the bottom of Australia.. huge migrations.. pretty impressive…
Season 7, let’s gooo! I love your channel Kris, keep up the good work! Quick question, have you considered doing a video on the Jersey Shore shark attacks of 1916?
Thanks for the great video :) I live in Algoa Bay and am an active ocean user here, as part of my job (marine research) and recreationally (open water swimming & diving) and have been following the research so far on these developments. We do have orcas in our area, often coming to visit us on the "wild side" closer to Cape Recife while most of the white sharks seem to prefer hanging out near Bird Island (there is currently only 1 shark cage diving operator with a permit to do so here). It would be interesting to see if that pod can learn behaviour from Port & Starboard and use that to hunt, as they are know to hunt the dolphins here quite often. Would also be interesting to see the effects on other shark species caused by the increased white population in the area such as the raggy's that prefer to hang out closer to the more populated beaches (Hobie, Pollock, Kings, but are not a threat to swimmers). Hope to see more updates on this in the future!
When I was in Cape Town in 2018, the great whites had already started to move and everything I read online, pointed to them having shifted east along the coast. That was over 5 years ago.
Thanks for another interesting and informative video. I do remember reading how great white sharks would disappear from an area off the Calafornian coast near the Farallon Islands when a group of Orcas appeared in the area however the sharks would return after the Orcas were gone. There was also footage shot from a shark tour boat of two Orcas killing and eating the liver of a Great White shark in that area. At first it was believed to be a mother and her calf but later Orca researchers stated it was simply an adult and juvenile from the same group.
About 25 years ago a Great White was killed by Orcas at the Faralon Islands off San Francico. The Faralons are the home of a big seal colony which of course attracts the sharks. Some scientists were there at the time and saw the event. Several of the sharks were tagged. As soon as it happened the sharks immediately dove off the nearby shelf where the depth drops a couple of thousand feet, and were next observed off the Hawaiian Islands. The Great Whites stayed away for several years.
Yes, that's what I thought of too while watching this. I heard about this and other observations of sharks knowing when one of their kind was killed - the scientists believed they detected the shark blood, and all the sharks immediately fled and stayed away from the area for a long time.
I think they came back the next season in that case. But it’s theorized that the reason they all disappeared is that they smelled the rotting carcass and oil from the liver, taking it as a sign of danger.
Port and Starboard are an example of Orcas having bent dorsal fins in the wild. It doesn't just happen in captivity, apparently 1% of all Orcas have bent dorsal fins, whether they're in the wild or not. That's not defending places like Seaworld either. I hate those places.
It’s something to do with diving deep keeps their fin upright but because SeaWorld orcas can’t dive deep the collagen in their fin gets weak and collapses.
@@austintrousdale2397I didn't think there was when they had the Orcas. The documentary film, Blackfish, really opened my eyes to the practices of places like Seaworld.
Here is my take: Sharks and Killer Whales aren't a new species. Killer Whales have been around for over a million years, sharks considerably longer. It would be egotistical of humans to say this is the first time in history of these animals that they have been caught in a hunting cycle. Most notoriously, Megalodon versus the Killer Whales ancestors perhaps. However, I knew the sharks were still around, the only question was which way did they go? East would not have been my guess, as the seal colonies were the other way. I'm glad they were "found"...the question is, did they want to be?
I generally agree, although KWs were not competitors or predators of Megalodon. A Meg would make a quick snack of a KW unless it was a very large pod. Hell, there’s not even any evidence of KWs taking out any GW over 15 feet, when they start to get much more massive. But the KW ancestors around at the time were significantly smaller than today’s KWs, so Megalodon’s advantage would have been even greater. Megalodon also lasted longer than Lyviatyn (sp?) despite an overlap in their range and time period. If what amounts to a 50 foot ancient sperm/killer whale couldn’t make Meg go extinct, then white sharks as a species probably aren’t in any danger from KWs.
@@bluemarlin8138 "Killer whales ancestors" Killer Whales have only been around a million years or so. Meg died out a lot longer than that. Their ancestors would have been much bigger and bulkier.
Welcome Back Kris! You were my first ..subscribed to channel LOL I'm in British Columbia where the Orca also calls home. I've seen them upclose, absolutely breathtaking beings. I don't like what they do to GWs, however, I'm struck by the fact they know to flip a GW into a catatonic state! ( still savage to rip out the liver but prey upon prey is never kind).
It’s nature and normal predation event. But with water temperatures rising us Canadians are starting to see white sharks in our waters with greater frequency
your pronunciation of KwaZulu Natal was hilarious, I had to read the name on screen to know where you were referring to 😅😅 very interesting video though! No seals here on the East coast around the KwaZulu Natal region, or even the Eastern Cape south of us as far as I know. Water temps are warm, so very few Great White Sharks too...
I grew up in East London, which is on the east coast, in the seventies, eighties and nineties. We saw great whites often then, especially off the wild coast. I’m sure there could be more now, but they’ve always been there!
Honestly I’d have thought that the sharks left because the discovery channel kept baiting them with rubber seals to make them launch out of the water. That must take a ton of energy to do with zero payoff.
I live in Plettenberg bay and can confirm this was the case last year, although we wait to hear numbers of Great Whites from this season. Plettenberg bay has also been introduced in the area and greater measures have been put in place to protect swimmers. Thanks for a great video.
What the Orcas do will be very interesting. There's such a huge population of seals they can eat, but Orcas tend to focus on one source food - dependent on the area. If they use up resources to chase the sharks, that could really demonstrate their reluctance to switch food sources.
They can’t just live off shark liver oil. They have to have protein to survive, and they weren’t getting it from the sharks, because all they ate was the livers. They must also be eating seals, fish, squid, or something else. Also, a diet consisting exclusively of sharks would wear down their teeth to nubs. Shark skin is highly abrasive, and KWs that prey on sharks have a huge amount of tooth wear. Seems like a bad long-term survival strategy.
@@KonradvonHotzendorf Thank you for that information. I was wondering what else the orcas were eating, because the shark liver is clearly not enough food if that was their primary source. But if they were eating a large quantity of poor quality food, it would make sense that they would eat only the shark liver. But is the rest of the shark even poorer quality than what else they were eating? Does anyone know what else they were eating?
Its fascinating seeing 2 different apex predators in the same water together. and further amazing seeing how orcas have turned great whites into a source of food. It makes me wonder what This relationship will look like in the future. Will Great whites develop defense strategies? I feel like we’re seeing a form of evolution in progress and it’s really exciting.
😄Thanks Kris for another interesting video!🦈 It would be so interesting to place tracking devices on the two orcas responsible to see their movements in real time. It does make me wonder why the killer whales are chasing around great whites when there is a large seal population to the west? I get that the sharks have nutritious livers, however it seems like such an effort and use of energy to be constantly chasing around sharks when the killer whales could just be eating seals instead.
Orcas are notoriously picky eaters and social groupings will choose what they want to eat. Port and Starboard have also perfected their hunting techniques to hunt white sharks.
In comparison to seals, sharks are slower moving and less agile, therefore it takes less effort by the Orcas to kill sharks, than it would take them to kill seals.
According to the video, right before this started, the shark population was especially high. It could be that the orcas started hunting them just because the population density made it unusually easy to get enough food that way. Once the population drops, they might change to hunting something else more plentiful, like the seals.
@@jonathandefoy6376 To clarify things a bit, various groupings or pods of Orcas specialize in one form of prey. One pod living in one area might specialize in hunting seals and won't hunt fish, while another pod in the next territory over would specialize in hunting fish and ignore any seals they might come across. So it's clear that Port and Starboard have developed a taste for Great White livers and Orcas being Orcas, they now specialize in this and will only eat Great White livers and nothing else.
Just been in Southern Australia this year and the White Sharks seen by tour operators are skyrocketing there too. They told me since around 1 year they have much more sightings than in the years before. Maybe some of the sharks moved over and we already know that some great whites cross between these areas. Did you heard anything about that?
I live in Adelaide South Australia and those numbers have been increasing for a few years which is normal considering the amount of protection now afforded to them but also due to the many new zones allocated as no fish zones etc to address the overfishing here. Hard to know for sure
Good, it’s their ocean and they deserve it all. They are amazing creatures and really get a bad rep, Ive dived cage free numerous times with all types of sharks including the great white. I love them, and can’t stand that my native country uses nets as it’s so devastating for all the marine life. So I hope fellow southern hempishere don’t follow suit.
It’s likely that their numbers are just increasing there due to both the sharks and marine mammals being protected. The timeline is about right. White sharks were protected in the mid-1990s, so the ones that used to get killed off as juveniles or subadults are now making it to breeding age. And many of the bigger sharks from back then are still alive and still breeding.
I lost a friend to a shark attack just over a couple of years ago (off a beach known as Chintsa). We live on the Eastern side of South Africa, almost exactly where you placed the shark icons on the map. I dont think theyre going to be putting up any signs or spotters though. The Eastern Cape is run really badly compared to the Western Cape. Thanks for the video, I think Ill stay out the water here.
Hi, I just came across your channel and I find your material is very interesting. I live on the east coast of Canada in Moncton New Brunswick. The last couple of years we’re seeing an influx of great white sharks in our waters. This is very unusual as we hardly heard of any white sharks in our waters because we always thought our waters were too cold for the species. When the waters cool for the winter do you think they will leave because of the cold water? Thanks👍💪🏻………….Don
I was in Ocean Shores, WA with one of my partners for an event and I told him, "I really want to visit Sharky's while we're there." (It's an all shark store with a giant white shark mouth for an entryway, haha.) He was like, "okay..." and we did manage to fit it in... I was so over the top. I was tickled that they had plush sharks accurate enough that I could identify the species, and shark stickers and shark magnets, and I babbled at him constantly, telling him about each shark on every item and info-dumping shark facts on him, which left him slightly bemused as he followed my autistic butt around the store. I turned to him and said, "Uh, yeah, I really like sharks." "I see that," he said. "I thought you just liked them like you like all animals. I thought you 'liked them a normal amount'." I confessed that sometimes even with him (I've been with my partners for over 20 years now) I tone down my info-dumping because I know it can get a little annoying. All this is to say that on that trip, I told him about orcas eating South African white shark livers, and how the sharks had skedaddled. A couple mornings ago he'd just gotten up and I pounced on him as he blinked blearily at me, trying to go to do his morning routine but sidelined by my need to talk about sharks. "Remember how I told you about the white sharks leaving because the orcas were hunting them in South Africa??" He made a sleepy affirmative sound. "They know where they went!" He was like, "Ohhh," and wandered back off to brush his teeth or something. Also, if anyone is in Ocean Shores, do visit Sharky's.
I would like to see marine biologists keeping track of the chain of prey and what that does to the ecosystems. I would think the sharks would follow the prey more than run and hide from the Orcas. And what has changed that the orcas are going after the sharks? Could it be the fight for survival caused by over fishing?
Great video Kris. Good to get an update on whats been going on with the Great Whites. Did you ever see the interview with Chris Fallows on the missing sharks to do with the ones caught on the fishing lines?
There was recently a huge shark spotted from the air in the Durban harbour KZN that was larger than the planes shadow that could only have been a great white.
I lived in SA for 33 years and regularly dived at the Aliwal Shoal off the Kwa-Zulu Natal coast, I dived many times and saw Bull and Tigers, but never a Great White...friends of mine that still live in SA and dive Aliwal regularly have sent me many video clips of them getting "Bumped" by Great Whites... My money is that the arrival of a hunting pod of Orca appearing in Cape waters (possibly from further up north in Namibian waters) has made them flee the area...
Live in Cape Town. Port and Starboard appear to be going after the 7 gills and will probably move on to the bronze whalers after. The South/East of of SA already super sharky with bull sharks and some tigers.
If two killer whales really are solely responsible then maybe they should be “removed” - and what’s the story with the collapse dorsal fins.?? Have they been released from captivity …!!! Two rogues without a pod to show them the ropes just doing their own thing. ??? Or is there something ealse going on what with the boat sinkings n all…???😳
When I was a kid, my very best friend moved to America from Durban/KZN. I dated her brother for a while as a teenager and young adult. They’d go home to see family every so often, and one time, he decided to stay for a while instead of coming home with his mom and dad, as he wanted to live with his cousins for a while and get some epic waves in. His sister and I were roommates, and one day she got a call that he’d had a ‘surfing accident’, and me being a shark-obsessed person since I saw JAWS when I was 2, immediately thought he’d been attacked by a shark. But, nope… he wiped out over a reef and sustained broken ribs, a partially collapsed lung, and had to have a bunch of coral removed from his skin. Her mom used to mess with me and tell me about all the times she’d been to the beach and seen great whites there. Then she’d laugh and laugh. I know that they’re much more likely to have Zambezis and tigers. But I guess that might be changing now…
That was the bit about the film Jaws that made me laugh. The Orca getting killed by the Shark!! When they found it washed up on the beach with chunks bitten out of it!!
I remember seeing an episode of Air Jaws (Nightstalker) several years ago, and one of the shark scientists collected the scat of the seals on Seal Island and analyzed it. They were under significant amounts of stress then. I wonder if they’re doing any better, now that the greater numbers of GWS have moved from the area?
The Orca vs. Great White shark phenomenon happened for the first time off the coast of San Francisco in 1997 near the Farallon Islands. Once the sharks blood hit the water all Great White sharks disappeared from the area for months. One shark had been tagged by scientists and was recorded diving to 500 meters and swam to Hawaii once the shark was killed. The orcas moved to San Francisco from Los Angeles and now the Great White has moved into the Los Angeles coastal areas. Unfortunately it looks like another sign of the magnetic pole shift.
@@Pearcewreck that is what I know since I am here. I also know the same thing is currently happening in South Africa and if you look at a globe you might notice the antipode of the California coast is the South African coast. I have global knowledge sorry to disprove your negative thoughts.
Aweome video on the great white.I stay in algoa bay. I have spotted the great white sharks recently but they not been too big and they were close to shore here from the boat often near the shore.the orcas are also spotted here at times. I am no marine biologist but if you ask me I would say these sharks are somewhat trapped as north of algoa bay the ocean water moves from tempered to warmer indian ocean currents. I beleive the great white likes to live in cooler waters as found south of algoa bay.there are not many seals here but there are 3 island where the endangered african penquins are found. I have def over the past 20 years seen less of them swimming as they use to be in the 1990s.Interestingly recently while fishing near the shore I noticed a raggertooth shark leap out the water next to the boat. I never seen this shark do it before but within a minute there was a 3 meter white around the boat
Hey man! I live in Algoa Bay! Interestingly, in December 2020 a friend and myself discovered a dead Orca on the rocks close to a Holiday resort (The Willows) near Port Elizabeth. We contacted the Local Marine Biologists, who told us that this Orca was only the 6’th one found dead on shore in South Africa. Somehow its fins got tangled in a rope…they are VERY RARELY seen in our area. My friend still have the pictures.
Some interesting info in the comments here, even if not so much in the video itself, much of it pertinent. I must add that Great whites have always moved East around the coast and close to shore. Some record sized great white sharks have been caught in nets in places like Trafalgar on the Kwazulu Natal Coast long before having apparently gone missing. They have feeding opportunities in the rich water of the Tugela shelf. They regularly migrated up the coast and returned. I used to see great whites hauled ashore on the beaches as child in Port Shepston, I have a picture somewhere of me sitting on one feeling its rough sand papery skin. I think crossing the Indian ocean to Perth Australia where numbers of GW have seen massive jump in numbers is also highly plausible in their escape from predators or not. Since the sharks disappearance from the Cape one wonders if the Orcas have disappeared too?
Most of the locals the scuba dive regularly most do shore entries on the false bay side and also in colder waters around houtbay. We used to go looking for 7 gill cow sharks and found them on occasions. The shark cage diving on the other hand was a bit of a sausage factory in the beginning until they all dissappeared. We also saw a few pods of Orca and they definitely had ana effect on cow sharks as well.
Strange that it took them so long to confirm this.Were some of the sharks not tagged? Logically the orca will follow.Guess the diving industry will have to adapt and be flexible to this.
Thank you so much! I absolutely love your channel; it's incredibly informative, entertaining, and well-presented. Your passion for sharks is truly remarkable. Could you consider making a video about the incidents of killer whales in Australia targeting and consuming white sharks, including their livers? I'm curious if these orcas learned this behavior from their counterparts in South Africa. How do they share this knowledge on preying on white sharks? We've seen white shark carcasses with missing livers; could this potentially threaten the white shark population due to orca predation?
Hi, Leonidas. I'm curious, where in Australia do you live? Where have you seen great white carcasses missing livers? I hadn't previously heard of this happening in Australia, too.
We're in season 7 already?! Woah. I've been seeing quite a bit on Port and Starboard lately. I hope there's no real increase in shark attacks in the east but I reckon they'll be a bit because people there aren't used to them being there as much. I'd like to know if this turns into a ping pong chase. 😅
@@sharks3653why not? Theyyre doing it completely on their own , and its not a product of lack of food. To do anything to intefere would violate the very premise of scientists observing while remaining impartial.
@@jeremiahalguire8231 Looks like they deleted their comment. What did they say? ETA: Oh, I just saw it in my e-mails. I agree - we shouldn't interfer with nature. For once, it's not humans causing this (that we know of).
@@swordablaze9259 weird lol I disagree with their stance bit they didn't say anything crazy or anything , just that basically we should step in and euthanize port and starboard.
So any idea of how the White sharks knew to all move? Obviously, the sharks can determine that the killer whales are a threat, but I find it interesting how they all managed to move en masse in the same direction. I heard it hypothesised before that white sharks smell their own species blood and this could signal them that the area wasn't safe
Humans have derived the pheromone or chemical given off by GWS when attacked. It spreads quickly and all the GWS go deep and bug out. There’s a good TV documentary on it. “Killer shark versus killer whale” on National Geographic WILD.
I live in south africa. The water temperature where the sharks have moved to are actually warm. It's normally tiger shark and bull shark territory. No seals. Great video
I wonder if the Great Whites will start eating tigers and bulls?
@@PoetofHateSpeechthey're fully capable of doing so. Warm blooded mackerel sharks are faster and have more stamina than requiem sharks. Great whites are known to eat large bronze whalers and dusky sharks that got hooked on fishing lines.
I'm not sure to be honest. It's not unheard-of to find great whites in the natal area but it's certainly not the norm. Warm Mozambiquen current runs past there where as cold Benguela current flows in the Cape thus the seals. Will be interesting to see what will happen. Especially with the seal populations in the cape having 1 less predator
@@ODGreenZa do they still have shark nets in Kwazulu-Natal?
@@weilim10 yeah its maintained by the KwaZulu-Natal sharks board.
Great topic to kick off season 7. Looking forward to another great season.
We’re baaaack 🦈😁😁
Port & Starboard were spotted in Plett about two months ago and it`s believed they move up and down the southern coast between Cape Town and the Garden Route.
The same thing happened off California a few years ago. They filmed orcas killing a white shark, and the sharks just left the area. It lasted for about a year and then they returned, but I think it's happened a couple of more times since then, and always after orcas are spotted hunting them. My guess is this has been happening for far longer than we have been observing and is just natural.
Yep I agree. 2 Apex predators with 1 primary food source being marine mammals. It’s highly likely this scenario & relationship between them has existed for a long time. Just like when it was reported that the Orcas had “learned” how to place GWs into the tonic immobility. They’ve likely done this for many many years & it was simply the first time We observed it as humans. Cool stuff.
if i remember it right, the had trackers on some of the sharks. they fled all the way to Hawaii.
It’s mad how they all know to leave, like they got some orca spotting WhatsApp group. Fascinating animals.
I work as a Shark Spotter in Plettenberg and I must say I’m happy the GW’s are back and we are here to make sure no more attacks occur ❤❤They play an important role
That's great to hear! Have there been more sightings lately?
Is the Robburg express still around? Used a whole bottle in four breaths when I saw him/her
the 2 orca,s needs to be dealt with, ok i mean disposed of they are upsetting the ballance.
I’m from the east coast of South Africa and I can definitely say we have had a marked increase in white shark activity. They were always there before and we have had the odd fatal attack over the years but nothing like the recent activity. There are some particularly aggressive white sharks lurking around certain areas and I know of spear fishermen having a really hard time with them. There are no seals in the warmer waters so it makes sense that the sharks are looking for alternatives.
is it safe to swim around the coast of South Africa
and are the theers warm
@@chrisbennett6260kwazulu natal / durban and the East cost has great water temp, much warmer water - no need for wetsuits, can wear just board shorts.
Shark attacks are very rare, hardly ever happens
@@chrisbennett6260 Yeah swimming is fine , the beaches are safe and there are lifeguards. The water is plenty warm in summer, gets a little chilly in winter though. If you are further up the coast in Durban then its warm all year round and there are shark nets. The beers are always cold :)
Thanks for the shout out Kristian and great video! I don't know if the orcas will necessarily follow the white sharks east, the waters that side are much warmer, sub-tropical and even up to tropical, so I suppose it depends on whether these orcas like it hot or cold! I do hope the sharks can find some refuge though. Another worrying thing is that up in Kwazulu-Natal there are lethal shark measures - nets and drumlines, so as the sharks move east there's a higher chance of them getting killed which is super worrying.
Really enjoyed watching you both! Super interesting video
Those KwaZulu-natal shark nets are deadly!
Can’t be that shocked that they moved away from the danger zone given, if I remember correctly, some research into shark repellent was based on the chemical being released into the water when a shark died from an attack that was like a warning to others. If I’m remembering. This correctly one would guess that the potential number of times that Port & Starboard attacked that the constant release of such a chemical signal would dictate a natural instinct to leave an area and that only thing to really be determined would be just how far that distance away was and what direction it was in. Glad to see they’ve been found and of course now a whole new bunch of questions to be answered based on their presence in these waters in greater numbers will keep researchers busy for years to come.
Yes there was a documentary I think it was around Mexico and a particular island they used to reside and mate but then moved on because of the Orca attacks. I remember this from years ago.
I have read too, that some of the larger white sharks in South Africa, have been tracked heading across and down around the bottom of Australia.. huge migrations.. pretty impressive…
😊 Great to see you back Kris #SharkBytes, missed seeing GB you here. Hope you had a great break 🦈🏴
Glad to be back 😁
I've more or less followed this story. I think it is very interesting. Thanks for all your wonderful videos!
A few twists and turns in it that’s for sure
Season 7, let’s gooo! I love your channel Kris, keep up the good work! Quick question, have you considered doing a video on the Jersey Shore shark attacks of 1916?
It’s on the list I promise 🦈😁
@@SHARKBYTESawesome, I can’t wait😁
Thats a neat video idea🦈🦈🦈🦈🦈
How did I miss this yesterday. Welcome Back
Such a wild thing. Thanks so much for all the knowledge you give us :) Love your videos!
Thanks so much for watching!
@@SHARKBYTES Man, your welcome bro!
You are so more than welcome
Thanks for the great video :) I live in Algoa Bay and am an active ocean user here, as part of my job (marine research) and recreationally (open water swimming & diving) and have been following the research so far on these developments. We do have orcas in our area, often coming to visit us on the "wild side" closer to Cape Recife while most of the white sharks seem to prefer hanging out near Bird Island (there is currently only 1 shark cage diving operator with a permit to do so here). It would be interesting to see if that pod can learn behaviour from Port & Starboard and use that to hunt, as they are know to hunt the dolphins here quite often. Would also be interesting to see the effects on other shark species caused by the increased white population in the area such as the raggy's that prefer to hang out closer to the more populated beaches (Hobie, Pollock, Kings, but are not a threat to swimmers).
Hope to see more updates on this in the future!
We see Orca's in Jeffereys bay every December -~ 60km East of Algoa for our foreign friends . Love them to bits.
Shark Bytes is back! YEAH! 🦈
Missed you and your shark content! Happy you're back!
Sunday nights are once again Shark Bytes Nights. Good to have you back, and with a great video to kick off series 7.
ooo been awhile since ive seen ur vids happy to see em recommended again
love your videos
We’re back! 🦈🦈
South African here 🇿🇦! Loved this video 🦈
Scientists: Wooh, glad we found you. We were worried about you!
GW Shaks: Its okay, mate, we're doin great!
hahah rate this comment
Welcome back Kris, I clicked so fast when I saw you had a new video up 😂 Cracking start to season 7 🦈
When I was in Cape Town in 2018, the great whites had already started to move and everything I read online, pointed to them having shifted east along the coast.
That was over 5 years ago.
Glad to see you back!
Can't wait for all of the interesting content this season.
Got some absolute corkers coming up in the next 2 weeks!
Another really interesting video - thanks for the link to the other one you made too! ❤
Thanks for another interesting and informative video. I do remember reading how great white sharks would disappear from an area off the Calafornian coast near the Farallon Islands when a group of Orcas appeared in the area however the sharks would return after the Orcas were gone.
There was also footage shot from a shark tour boat of two Orcas killing and eating the liver of a Great White shark in that area. At first it was believed to be a mother and her calf but later Orca researchers stated it was simply an adult and juvenile from the same group.
About 25 years ago a Great White was killed by Orcas at the Faralon Islands off San Francico. The Faralons are the home of a big seal colony which of course attracts the sharks. Some scientists were there at the time and saw the event. Several of the sharks were tagged. As soon as it happened the sharks immediately dove off the nearby shelf where the depth drops a couple of thousand feet, and were next observed off the Hawaiian Islands. The Great Whites stayed away for several years.
Yes, that's what I thought of too while watching this. I heard about this and other observations of sharks knowing when one of their kind was killed - the scientists believed they detected the shark blood, and all the sharks immediately fled and stayed away from the area for a long time.
I remember that. They dove down about 1500 metres or something and swam 1000 miles away or.something. Mental.
I think they came back the next season in that case. But it’s theorized that the reason they all disappeared is that they smelled the rotting carcass and oil from the liver, taking it as a sign of danger.
Hello. Good Evening Kris😊Happy Sunday 💞
Port and Starboard are an example of Orcas having bent dorsal fins in the wild. It doesn't just happen in captivity, apparently 1% of all Orcas have bent dorsal fins, whether they're in the wild or not. That's not defending places like Seaworld either. I hate those places.
1% of wild orcas have completely collapsed dorsal fins. 100% of adult captive male orcas have completely collapsed dorsal fins.
It’s something to do with diving deep keeps their fin upright but because SeaWorld orcas can’t dive deep the collagen in their fin gets weak and collapses.
Is there value in attractions/facilities like SeaWorld if they no longer contain orcas?
@@austintrousdale2397I didn't think there was when they had the Orcas. The documentary film, Blackfish, really opened my eyes to the practices of places like Seaworld.
@@MermaidMusings7thanks for the info. That doesn't surprise me one bit.
I've been following this, and I'm glad to see the sharks have been found.
Here is my take: Sharks and Killer Whales aren't a new species. Killer Whales have been around for over a million years, sharks considerably longer. It would be egotistical of humans to say this is the first time in history of these animals that they have been caught in a hunting cycle. Most notoriously, Megalodon versus the Killer Whales ancestors perhaps. However, I knew the sharks were still around, the only question was which way did they go? East would not have been my guess, as the seal colonies were the other way.
I'm glad they were "found"...the question is, did they want to be?
I generally agree, although KWs were not competitors or predators of Megalodon. A Meg would make a quick snack of a KW unless it was a very large pod. Hell, there’s not even any evidence of KWs taking out any GW over 15 feet, when they start to get much more massive. But the KW ancestors around at the time were significantly smaller than today’s KWs, so Megalodon’s advantage would have been even greater. Megalodon also lasted longer than Lyviatyn (sp?) despite an overlap in their range and time period. If what amounts to a 50 foot ancient sperm/killer whale couldn’t make Meg go extinct, then white sharks as a species probably aren’t in any danger from KWs.
@@bluemarlin8138 "Killer whales ancestors"
Killer Whales have only been around a million years or so. Meg died out a lot longer than that. Their ancestors would have been much bigger and bulkier.
Welcome Back Kris! You were my first ..subscribed to channel LOL I'm in British Columbia where the Orca also calls home. I've seen them upclose, absolutely breathtaking beings. I don't like what they do to GWs, however, I'm struck by the fact they know to flip a GW into a catatonic state! ( still savage to rip out the liver but prey upon prey is never kind).
Honoured to be the first channel you subscribe to!!
It’s nature and normal predation event. But with water temperatures rising us Canadians are starting to see white sharks in our waters with greater frequency
Yey!! So happy ur back, been impatient checking every sunday for this episode 🎉
your pronunciation of KwaZulu Natal was hilarious, I had to read the name on screen to know where you were referring to 😅😅 very interesting video though! No seals here on the East coast around the KwaZulu Natal region, or even the Eastern Cape south of us as far as I know. Water temps are warm, so very few Great White Sharks too...
Better than an AI narrator I hope 😅
Kelp forest diving? great I have another phobia now thanks man
So glad to see shark bytes back for another season! Such an interesting episode to start off too, cant wait for the next one
I grew up in East London, which is on the east coast, in the seventies, eighties and nineties. We saw great whites often then, especially off the wild coast. I’m sure there could be more now, but they’ve always been there!
yup - JBay aswell - this is just nature going through a cycle
Plenty around Cannon Rocks and Kenton On Sea too due to the seal population on an island not far offshore between those two places...
The best part of Sunday is back!
Shark Bytes Sundays 🦈🦈🦈
I always wanted to do the shark cage diving in South Africa
I love ya vids mate
Thanks so much!
Honestly I’d have thought that the sharks left because the discovery channel kept baiting them with rubber seals to make them launch out of the water. That must take a ton of energy to do with zero payoff.
I live in Plettenberg bay and can confirm this was the case last year, although we wait to hear numbers of Great Whites from this season. Plettenberg bay has also been introduced in the area and greater measures have been put in place to protect swimmers. Thanks for a great video.
What measures? I’m not doubting or anything, just really curious about the measures put in place, thanks!
Weren’t there a couple of fatal attacks in that general area, not too long ago?? Oops… I commented before I watched the entire video.🤣
Mmh orcas remind me of my cat. Lovable, smart, and constantly up to no good lol
What the Orcas do will be very interesting. There's such a huge population of seals they can eat, but Orcas tend to focus on one source food - dependent on the area. If they use up resources to chase the sharks, that could really demonstrate their reluctance to switch food sources.
Orcas are doing what humans have been doing for thousands of years. Killing off the competition
The theory about Port and Starboard is they eating a poor source of food in the artic and come to snack on shark liver to make up the deficiency
They can’t just live off shark liver oil. They have to have protein to survive, and they weren’t getting it from the sharks, because all they ate was the livers. They must also be eating seals, fish, squid, or something else. Also, a diet consisting exclusively of sharks would wear down their teeth to nubs. Shark skin is highly abrasive, and KWs that prey on sharks have a huge amount of tooth wear. Seems like a bad long-term survival strategy.
@@KonradvonHotzendorf Thank you for that information. I was wondering what else the orcas were eating, because the shark liver is clearly not enough food if that was their primary source. But if they were eating a large quantity of poor quality food, it would make sense that they would eat only the shark liver. But is the rest of the shark even poorer quality than what else they were eating? Does anyone know what else they were eating?
@@NoOne-bp2jw They thinking squid🦑
We missed you. So glad you are doing a new season 😁
We’re baaaaackkkk 🦈🦈🦈😁
Also don't forget the Chinese long line fisherman target all sharks for fins along the South African Coast
Its fascinating seeing 2 different apex predators in the same water together. and further amazing seeing how orcas have turned great whites into a source of food. It makes me wonder what This relationship will look like in the future. Will Great whites develop defense strategies? I feel like we’re seeing a form of evolution in progress and it’s really exciting.
Yeah they dive down deep where the orca can't dive that deep and the sharks don't really communicate with each other and swim in pods like Orcas
All the orca scars in big great whites indicate that they escaped by diving. f
😄Thanks Kris for another interesting video!🦈
It would be so interesting to place tracking devices on the two orcas responsible to see their movements in real time. It does make me wonder why the killer whales are chasing around great whites when there is a large seal population to the west? I get that the sharks have nutritious livers, however it seems like such an effort and use of energy to be constantly chasing around sharks when the killer whales could just be eating seals instead.
Orcas are notoriously picky eaters and social groupings will choose what they want to eat. Port and Starboard have also perfected their hunting techniques to hunt white sharks.
In comparison to seals, sharks are slower moving and less agile, therefore it takes less effort by the Orcas to kill sharks, than it would take them to kill seals.
According to the video, right before this started, the shark population was especially high. It could be that the orcas started hunting them just because the population density made it unusually easy to get enough food that way. Once the population drops, they might change to hunting something else more plentiful, like the seals.
@@jonathandefoy6376 To clarify things a bit, various groupings or pods of Orcas specialize in one form of prey. One pod living in one area might specialize in hunting seals and won't hunt fish, while another pod in the next territory over would specialize in hunting fish and ignore any seals they might come across. So it's clear that Port and Starboard have developed a taste for Great White livers and Orcas being Orcas, they now specialize in this and will only eat Great White livers and nothing else.
@@Riceball01 thanks for clarifying things, my comment was muddier then intended but yeah that is exactly
Just been in Southern Australia this year and the White Sharks seen by tour operators are skyrocketing there too. They told me since around 1 year they have much more sightings than in the years before. Maybe some of the sharks moved over and we already know that some great whites cross between these areas. Did you heard anything about that?
I live in Adelaide South Australia and those numbers have been increasing for a few years which is normal considering the amount of protection now afforded to them but also due to the many new zones allocated as no fish zones etc to address the overfishing here. Hard to know for sure
They were up around nsw far north coast around 5+ years ago
Good, it’s their ocean and they deserve it all. They are amazing creatures and really get a bad rep, Ive dived cage free numerous times with all types of sharks including the great white. I love them, and can’t stand that my native country uses nets as it’s so devastating for all the marine life. So I hope fellow southern hempishere don’t follow suit.
@t-dog8528 some Great Whites follow the humpback migration every year (a small number). Sometimes as far north as the great barrier reef.
It’s likely that their numbers are just increasing there due to both the sharks and marine mammals being protected. The timeline is about right. White sharks were protected in the mid-1990s, so the ones that used to get killed off as juveniles or subadults are now making it to breeding age. And many of the bigger sharks from back then are still alive and still breeding.
A few killer whale sightings here in Plettenberg bay 2022/2023. I managed to catch one on video. We now have Shark Spotters as of early 2023.
I lost a friend to a shark attack just over a couple of years ago (off a beach known as Chintsa). We live on the Eastern side of South Africa, almost exactly where you placed the shark icons on the map. I dont think theyre going to be putting up any signs or spotters though. The Eastern Cape is run really badly compared to the Western Cape. Thanks for the video, I think Ill stay out the water here.
I’m very sorry for your loss.
Hi, I just came across your channel and I find your material is very interesting. I live on the east coast of Canada in Moncton New Brunswick. The last couple of years we’re seeing an influx of great white sharks in our waters. This is very unusual as we hardly heard of any white sharks in our waters because we always thought our waters were too cold for the species. When the waters cool for the winter do you think they will leave because of the cold water? Thanks👍💪🏻………….Don
Wow! They're found that far up, now? I'm from the UK, and I think it's a matter of time before they're found over here.
Thank you, from South Africa 🇿🇦
I was in Ocean Shores, WA with one of my partners for an event and I told him, "I really want to visit Sharky's while we're there." (It's an all shark store with a giant white shark mouth for an entryway, haha.) He was like, "okay..." and we did manage to fit it in... I was so over the top. I was tickled that they had plush sharks accurate enough that I could identify the species, and shark stickers and shark magnets, and I babbled at him constantly, telling him about each shark on every item and info-dumping shark facts on him, which left him slightly bemused as he followed my autistic butt around the store.
I turned to him and said, "Uh, yeah, I really like sharks."
"I see that," he said. "I thought you just liked them like you like all animals. I thought you 'liked them a normal amount'." I confessed that sometimes even with him (I've been with my partners for over 20 years now) I tone down my info-dumping because I know it can get a little annoying.
All this is to say that on that trip, I told him about orcas eating South African white shark livers, and how the sharks had skedaddled. A couple mornings ago he'd just gotten up and I pounced on him as he blinked blearily at me, trying to go to do his morning routine but sidelined by my need to talk about sharks.
"Remember how I told you about the white sharks leaving because the orcas were hunting them in South Africa??"
He made a sleepy affirmative sound.
"They know where they went!"
He was like, "Ohhh," and wandered back off to brush his teeth or something.
Also, if anyone is in Ocean Shores, do visit Sharky's.
WOOOO LETS FUCKING GOOO, Cheers mate, nothing better than to have one of your vids along my beer at night!
FINALLY! Bad enough we don’t get to see as much of Hal and his channel now, I was in Shark Bytes withdrawl. Welcome back our British friend!🤮😆🤘🦈🤘
I'm with you I keep checking sharks happen but nothing I'm starting to wonder what Hal's problem is he seems to have become obsolete over night
@@DebraOdonnell-zb3vx He’s pissed about woke YT. Can’t say I blame him.
@@shredhead4604 can't blame him either but it's utube can't say anything bad otherwise they ban you miss him
I would like to see marine biologists keeping track of the chain of prey and what that does to the ecosystems. I would think the sharks would follow the prey more than run and hide from the Orcas. And what has changed that the orcas are going after the sharks? Could it be the fight for survival caused by over fishing?
Sharks flee areas where other sharks are killed. There are studies done on it.
I live in Kwazulu-Natal, time to stop swimming in these waters. Great video, thank you.
Yeeyy!! I'm so glad Shark Bytes is back! ♥️
Welcome back! Hope you had a good break from video making.
Yay! Happy Day SB back! Best day- all is right again in the world 🦈☮️
Yesss your back 🎉
Will Season 7 be the one where SharkBytes jumps the shark???
I'll let myself out...
Would be getting desperate here 😉😂
I LOVE your show!!
ugh . . . I'm diving that side next week again. . . work, comforting.
Great video Kris. Good to get an update on whats been going on with the Great Whites.
Did you ever see the interview with Chris Fallows on the missing sharks to do with the ones caught on the fishing lines?
Woohoo!!! Season 7... sea pandas 😂
Never trust a sea panda
Wow - thanks for this thoughtful analysis.
I wonder did many or any of the SA great whites move to Namibia considering all the seals that live there?
There was recently a huge shark spotted from the air in the Durban harbour KZN that was larger than the planes shadow that could only have been a great white.
No basking sharks in the area?
@@CharlesSeipel no
Right on. Thanks for sharing.
I lived in SA for 33 years and regularly dived at the Aliwal Shoal off the Kwa-Zulu Natal coast, I dived many times and saw Bull and Tigers, but never a Great White...friends of mine that still live in SA and dive Aliwal regularly have sent me many video clips of them getting "Bumped" by Great Whites...
My money is that the arrival of a hunting pod of Orca appearing in Cape waters (possibly from further up north in Namibian waters) has made them flee the area...
Live in Cape Town. Port and Starboard appear to be going after the 7 gills and will probably move on to the bronze whalers after. The South/East of of SA already super sharky with bull sharks and some tigers.
If two killer whales really are solely responsible then maybe they should be “removed” - and what’s the story with the collapse dorsal fins.?? Have they been released from captivity …!!! Two rogues without a pod to show them the ropes just doing their own thing. ??? Or is there something ealse going on what with the boat sinkings n all…???😳
Keep up the hard work I enjoy your shark related content, cheers 🍻from Washington USA
When I was a kid, my very best friend moved to America from Durban/KZN. I dated her brother for a while as a teenager and young adult. They’d go home to see family every so often, and one time, he decided to stay for a while instead of coming home with his mom and dad, as he wanted to live with his cousins for a while and get some epic waves in. His sister and I were roommates, and one day she got a call that he’d had a ‘surfing accident’, and me being a shark-obsessed person since I saw JAWS when I was 2, immediately thought he’d been attacked by a shark. But, nope… he wiped out over a reef and sustained broken ribs, a partially collapsed lung, and had to have a bunch of coral removed from his skin. Her mom used to mess with me and tell me about all the times she’d been to the beach and seen great whites there. Then she’d laugh and laugh. I know that they’re much more likely to have Zambezis and tigers. But I guess that might be changing now…
That was the bit about the film Jaws that made me laugh. The Orca getting killed by the Shark!! When they found it washed up on the beach with chunks bitten out of it!!
I remember seeing an episode of Air Jaws (Nightstalker) several years ago, and one of the shark scientists collected the scat of the seals on Seal Island and analyzed it. They were under significant amounts of stress then. I wonder if they’re doing any better, now that the greater numbers of GWS have moved from the area?
The Orca vs. Great White shark phenomenon happened for the first time off the coast of San Francisco in 1997 near the Farallon Islands. Once the sharks blood hit the water all Great White sharks disappeared from the area for months. One shark had been tagged by scientists and was recorded diving to 500 meters and swam to Hawaii once the shark was killed. The orcas moved to San Francisco from Los Angeles and now the Great White has moved into the Los Angeles coastal areas. Unfortunately it looks like another sign of the magnetic pole shift.
Certainly not the first time, only first time people became aware of orcas predation on white sharks
The magnetosphere is constantly changing. Highly doubtful that Orca on Great White predation is affected in any way by changes in the magnetosphere.
Been happening for thousands of years
An Amierican who truly believes everything only ever happens in America. Nothing ever happens anywhere else. Ever.
@@Pearcewreck that is what I know since I am here. I also know the same thing is currently happening in South Africa and if you look at a globe you might notice the antipode of the California coast is the South African coast. I have global knowledge sorry to disprove your negative thoughts.
Great reporting! So funny the hit "shark week" took! Nature will balance itself out.
Aweome video on the great white.I stay in algoa bay. I have spotted the great white sharks recently but they not been too big and they were close to shore here from the boat often near the shore.the orcas are also spotted here at times. I am no marine biologist but if you ask me I would say these sharks are somewhat trapped as north of algoa bay the ocean water moves from tempered to warmer indian ocean currents. I beleive the great white likes to live in cooler waters as found south of algoa bay.there are not many seals here but there are 3 island where the endangered african penquins are found. I have def over the past 20 years seen less of them swimming as they use to be in the 1990s.Interestingly recently while fishing near the shore I noticed a raggertooth shark leap out the water next to the boat. I never seen this shark do it before but within a minute there was a 3 meter white around the boat
I wish they would apply a shark watchers programme in my home town Australia 🇦🇺 instead of using nets, drums etc
Hey man!
I live in Algoa Bay! Interestingly, in December 2020 a friend and myself discovered a dead Orca on the rocks close to a Holiday resort (The Willows) near Port Elizabeth. We contacted the Local Marine Biologists, who told us that this Orca was only the 6’th one found dead on shore in South Africa. Somehow its fins got tangled in a rope…they are VERY RARELY seen in our area. My friend still have the pictures.
Mega interesting this, perhaps shows the killer whales might already be there 👀
Thinking about Port & Starboard continually chasing the GWs...Why do keep hearing Benny Hill music ?
Thought Port and Star played trick or treat with those GW's, glad they been located.
Some interesting info in the comments here, even if not so much in the video itself, much of it pertinent. I must add that Great whites have always moved East around the coast and close to shore. Some record sized great white sharks have been caught in nets in places like Trafalgar on the Kwazulu Natal Coast long before having apparently gone missing. They have feeding opportunities in the rich water of the Tugela shelf. They regularly migrated up the coast and returned. I used to see great whites hauled ashore on the beaches as child in Port Shepston, I have a picture somewhere of me sitting on one feeling its rough sand papery skin. I think crossing the Indian ocean to Perth Australia where numbers of GW have seen massive jump in numbers is also highly plausible in their escape from predators or not. Since the sharks disappearance from the Cape one wonders if the Orcas have disappeared too?
Most of the locals the scuba dive regularly most do shore entries on the false bay side and also in colder waters around houtbay. We used to go looking for 7 gill cow sharks and found them on occasions. The shark cage diving on the other hand was a bit of a sausage factory in the beginning until they all dissappeared. We also saw a few pods of Orca and they definitely had ana effect on cow sharks as well.
Strange that it took them so long to confirm this.Were some of the sharks not tagged? Logically the orca will follow.Guess the diving industry will have to adapt and be flexible to this.
Thank you so much! I absolutely love your channel; it's incredibly informative, entertaining, and well-presented. Your passion for sharks is truly remarkable. Could you consider making a video about the incidents of killer whales in Australia targeting and consuming white sharks, including their livers? I'm curious if these orcas learned this behavior from their counterparts in South Africa. How do they share this knowledge on preying on white sharks? We've seen white shark carcasses with missing livers; could this potentially threaten the white shark population due to orca predation?
Hi, Leonidas. I'm curious, where in Australia do you live? Where have you seen great white carcasses missing livers? I hadn't previously heard of this happening in Australia, too.
@@NormanInAustraliaI’m curious too… I keep up to date on shark info and hadn’t heard anything about this happening in Australia, either.
WOOOO THEY’RE BACK!!
Orcas were spotted off the coast of Durban a few months ago, not heard of any sightings since though
Never ever ever trust a sea panda lol
Great video!!!
your amazing dude keep it up man ❤❤
This makes sense as to why the seals were interacting so much with people on beaches a few months ago
Those Killer Whales are legends❤
No, they need culling. What do you think happens to an eco-system with no apex predators?🙄
Moronic comment
wooooo welcome back!!
We're in season 7 already?! Woah.
I've been seeing quite a bit on Port and Starboard lately.
I hope there's no real increase in shark attacks in the east but I reckon they'll be a bit because people there aren't used to them being there as much.
I'd like to know if this turns into a ping pong chase. 😅
@@sharks3653why not? Theyyre doing it completely on their own , and its not a product of lack of food. To do anything to intefere would violate the very premise of scientists observing while remaining impartial.
@@jeremiahalguire8231 Looks like they deleted their comment. What did they say? ETA: Oh, I just saw it in my e-mails. I agree - we shouldn't interfer with nature. For once, it's not humans causing this (that we know of).
@@swordablaze9259 weird lol I disagree with their stance bit they didn't say anything crazy or anything , just that basically we should step in and euthanize port and starboard.
So any idea of how the White sharks knew to all move? Obviously, the sharks can determine that the killer whales are a threat, but I find it interesting how they all managed to move en masse in the same direction. I heard it hypothesised before that white sharks smell their own species blood and this could signal them that the area wasn't safe
Sharks put off a farmone when killed so lots of it would mean run away
Humans have derived the pheromone or chemical given off by GWS when attacked. It spreads quickly and all the GWS go deep and bug out. There’s a good TV documentary on it. “Killer shark versus killer whale” on National Geographic WILD.