How many fish in a pond
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- Опубліковано 10 лют 2025
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Mark is The Pond Advisor, Mark Wilson has been a garden pond specialist for over 30 years. He provides these pond and water feature videos to help you guys and also to promote his multi-award-winning landscaping firm, Any Pond Limited. He is based in the UK (but has been called out overseas to work on many different water gardening projects).
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I have a1250l pond with lots of plants , 2 solar pumps , 10 adult goldfish and now at least 6 new born baby fish ! I installed in June in the lockdown and it is working fine ! Newts , frogs and abundant wildlife ( deer , fox , badger and bats ) after watching your vids you inspired me so thanks and keep up the good work ! 👍
Fantastic, thanks for your support and time watching the channel
5'*5'*3* raised pond with 6 shubunkin, 1 weather loach and some medaka. Full of plants. Powered by a solar pump/battery through a bog filter.
I've tried to keep the stocking low to mitigate the fact that water won't always be moving through the bog filter (although it does for at least a few hours a day as I force charge a separate 12v battery with my car battery charger).
Water is crystal clear and fish seem happy .
Enjoy your videos.
Thanks for watching
I've got to many fish in my pond so I've double my filtration. Another helpful video for the new pond owner to gain knowledge
Thank you, yes you can add more filtration and intact you can have more fish than water with an open system if you really want a fish farm lol 😆
hi ive just purchased a blagdon affinity grand corner pond i think its 650L how many fish should i keep in it ? the pump is also blagdon and seems to be doing a good job of keeping the water very clear. so far i have 10 fish in it. thanks
Hi
Can you recommend a uv clarifier. I bought a 36w Jebao in May this year and its faulty already. The electrics are tripping when I switch it on so think I need to get a better one. Your advice is always appreciated.
We don’t use or recommend using UV clarifiering units as they effect the beneficial bacteria Mother Nature is proving to process the waste. These units are a must however for sterile fish pools with a bareliner.
Not ever heard of a jebao must be a new company.
This is great information and a good resource for reference. This is not information that will stay in my head! I have no idea how many fish we have they’re hard to count as they keep swimming around 🤣
take a picture, then count them
I have a very small pond of 600 litres with an "in pond " filter (Filtral 6000 by Oase) so just four 6cm fish. I clean the filter about every 6 weeks during the Spring/Summer/Autumn. Its very well planted. That combo seems to work and has lasted like that for 10 years
LOL I live in the US I don’t look up how many gallons 600 L is how many inches is 6 cm lol
@@SHHWANZ 600 litres= approx 132 gallons. 6cms= approx 2.5 inches
Sounds like a lovely balance, plenty of plants and four goldfish. I have clients with the same set up with 40 fish and need to clean the filters every couple of days. But your setup sounds good.
@@catherinewholey3630 thx 😉
40 wow! That sounds like a lot!
Hi my pond is 1500 litres and has 74 adult goldfish. 30 plus baby goldfish. About 10 japanese koi and 5 English mirrors in. I have a huge amount of plants and a 30,000 litre kockney filter. The water is always really good and the fish are always breeding. As the large koi and mirrors out grow the pond I'll move them to a friend's larger pond but for now they are all under a foot in length and very happy.
that’s a lot of fish, but it sounds like the filter is able to cope with the waste. Like having Cats in a Room, you need a big kitty litter box. Thanks for sharing
my pond is 600 liter. that i have 8 fish 3 comet 4 shubunkin 1 koi all are no bigger then 4inch in size. i have a 3000l/h pump that runs to a 5000 liter pressurised filter with a built-in UV light. does that sound overkill?
no
Hi there. I have a 1000ltr pond that is currently not stocked. I've had it running for 5 months, it has an internal sponge filter, and an external home made plant pot filter running from a pump. The plant pot has a large course sponge, 200 bio balls and a good amount of rock on top to keep it all weighed down and looking nice. It feeds back into the pond.
How many goldfish would you think is a good amount for it? I was hoping to have 9 in total.
That’s personal choice, if you stock 9 they will stay small, do you have space to move them on if they get to much for you.
Hi Mark. We have an ecosystem pond with raised box filter in the rockery and waterfall. It was dug and designed by specialists. Its about 3ft deep and about 6 or 7 feet by 4 feet in water area. We have 2 koi that are obviously growing ! 2 tench and shubunkins and goldfish. Initialy we had about 12 fish. Weve plenty of plants, reeds etc....Weve had it 2 years and theyve bred both summers, so now weve about 15 fish and another 5 very small baby shubunkins from this year if they survive, is this gonna be too many fish ? The fish all seem happy and the pond is clean and gin clear.
Yes you too many, the pond is not really big enough for koi long term.
As your koi grow, they may require more space than the pond can offer.
More fish mean more waste. Plus higher fish population will consume more oxygen. As the pond becomes overpopulated, there might not be enough oxygen to go around, especially during the warmer months.
Overcrowding can also lead to health issues for fish, including the spread of diseases and parasites. It also can increase competition for food and resources.
While your pond might be okay for now, you may face challenges in the future if the fish population continues to grow, especially with the koi.
If you notice a decline in water quality, you might need to boost your filtration system.
If you’re attached to your fish and have the resources, you might consider expanding your pond or adding a secondary pond.
Thanks Mark. We are considering a secondary pond option for offspring currently and I fear my koi will have to move on eventually to another pond. I'd advertise ofcourse. 👍🏻
@@thefauxIDWATSON thanks for reaching out
Hi mark do you have a video on best deterrence for predators as want to keep the pond still looking nice without having to put a massive net over it anyhow tip what works and what doesn’t,
would be great thanks
Yes I have a heron video, not produced a best deterrence for predators video. Great call
Thanks Mark. how about what types of fish to have together and why?
I have a few videos on what types of pond fish but not why, I guess it’s personal preference
@@ThePondAdvisor Thanks
i have a small pond with approx 16 small goldfish and 4 grass carp, my pond measures approx 2 metres by 1.5 metres and is just under a metre deep in the deepest part
Sounds nice 👍🏻, how long have you had the grass carp? They will out grow a small pond
@@ThePondAdvisor yeah so i found out after i bought them, at the moment they about a couple of months old, i did email a photo of the pond when i was building it, my real name is stuart thomas, i don't know whether you remember? i've just purchased a slate urn which i'm in the middle of completing.
I am setting up a 700L lily clearview garden aquariumin the UK this weekend. I am searching for what fish to put in it and I am really drawn to Shebunkins. How many do you think I could have in there? I will be running the allpond solutions all in one cup-311 for filtration, fountain and uv steriliser. I have very established indoor aquariums so I can use the media from those to cycle, but willstill wait for a couple weeks before adding my permanent fish. I follow you as you have the same weather as me so your advice inthe winter is going to be helpful too, especially as my pond is going to be raised 🥶
I am not sure about the rating on the all in one pump, these types of filter are a lot of work. So I would not put many in, I guess it depends on how often you are going to clean the filter and what plants your going to grow. Lots of factors in a system that is potentially under filtered, I have bigger filters on much small cold water and tropical fish tanks
@@ThePondAdvisor My wildlife pond started 10 years ago with just 5 or 6 goldfish but they have bred year after year until now there are countless fish in my pond. They all appear healthy and active but I realise that there will soon be more fish than water. Should I just leave them to get on with it or should I start removing fish? How do get a Heron to visit?
@@johnguild861 to funny, it sounds like you have a fish pond that they share with the local wildlife, you don’t have to do anything until you are finding them too much work or you want them to grow, if you want a wildlife pond they it’s hard to have fish. They don’t mix that well
I have a 800 litre pond with just a fountain and a sponge running so far I have a buch of white cloud minnows and gambusia and three goldfish I have 2 that will being going in there when they get bigger. How many more goldfish can I get
Great question, I personally would not add any more after the 2 others you have. How many centimetres or millimetres are the minnows (35mm) and the gambusia 50mm (how many big ones do you have, or are they still small)?
How many in a bunch?
When I first put the minnows in I had around 10 but now they started breeding a lot. I think I have 5 gambusia that are mostly 50mm long
I have a preformed pond maybe 150 gal with 30 2inch gold fish. It's OK now but if these fish get big I may have too many. Right now it looks like I don't have enough. I'll see after this summer.
Sounds like a plan
yo! my pond is about 1200 liters and maby around5x3 meters long and 40 cm deep. i have 7 goldfish (1 is very big) and 7 koi (1 is also decently big) the rest are almost babies..
i have a 5600 filtration and some small plans in the pond(were getting some big lillys when they come out)
is this to many or can i add more fish??
i might be plannign on selling all the koi and buying allot of goldfish instead because of theyre breeding potential and swarmy lifestyle.
what should i do?
@The Pond Advisor
I would keep to what you have, the measurements are more than 1200 litres
Hey what are the shubunkins with extra long fins butterfly? Trying to find some bit hard to do when you're disabled and live in the sticks of Lincolnshire 😂
No they are simply sold under the name shubunkins, I guess it’s hard if you can’t select the fish yourself. The do have nice long fins.
Another great video Thank you Mark! I was wondering where can I buy the aquas cape ecosystem products such as the skimmer waterfall filter automatic dosing kits and intake bays etc, I’m building a 8,400 litre ecosystem pond in the next month and could really do with the products is it something I can buy from you? I’ve looked over the internet to buy these products but have only found US sites that do them, many thanks would love to hear from you!
We would love to supply and support you with product. Have a look at the website waterfeature.shop
We are based in the midlands in the 🏴 and ship all over the UK 🇬🇧 and some parts of Europe.
Hi mark, my pond is over a 1,000 litres. My pump/filter is a sponge one! Ive got 10 goldfish. Does this sound about right please?
Are you happy with the level of maintenance you are carrying out? Some people are happy cleaning often some want low attention systems. Really depends on the size of the sponge I guess.
Kind of, cleaning it every week
@@debzyoung3353 do you use a bucket of pond water, or is it acting more as a mechanical filter
@@ThePondAdvisor i don't use pond water! I'm very new to this, as you can tell...
I feel so bad because I was cleaning out my pond and I hit my goldfish round the head when it was hiding under weed it died with a rake how should I do it without killing my new ones
That sounds awful, how long after did you notice the goldfish was dead? Raking weed out of a pond, does your pond have earth in?
Hey, Im new to the channel and just subbed due to the amazing content. I just had a question. Are koi high urea producers like goldfish? My pond is around 450 gallons and has two 1 ft koi and eight 12 cm koi and 6 baby tinfoils. Does that make it over populated. I also have a canister and three power filters running on it. Is that enough?
Depends are you happy with the pond and filter system attention levels?
@@ThePondAdvisor well we just built the pond after pulling apart the old one so its a new beginning(been around three weeks) along with a week of cycling it. And yeah I also have around 7 water lettuce plants, 4 bunches of vallisneria( dont know if thats how its spelled😅) and two umbrella palms so it probably adds to the filteration. What do you think?
Hi
I have a 7000 litre pond with a filtoclear 30000, I'm new to ponds so I'm a little inexperienced and was wondering how many koi you would recommend my pond would comfortably hold, setting of at 200mm size and allowing for growth, any advice would be appreciated
Kind regards Ian
I would say, it really depends on the amount of work you are happy doing. 4 to 6 (other will say more),
@@ThePondAdvisor I'm happy doing the work, I just wouldn't want to over stock and end up with problems, thanks for the advice 👍
most box filters and pressurised filters there rating they show on the box is how much water they can handle if it was a wildlife pond not a fish pond thats the main problem
Yes, lots off people buy the filter for the size of the pond. sun light, plants and fish will effect the size of the filter. Its like buying a kitty litter box for the size off a room the cat is in. if you have one CAT you are ok will one box, if you have ten CATS then you need more boxes or more attention to keep them clean.
@@ThePondAdvisor a rough guide i use for stocking as long as the pond has good quality filtration (turnover rate volume of the pond minimum 1 time an hour and a filter that is rate for 3 times the volume of the pond they have) is 1 goldfish for every 200 litres and 1 koi for every 750 litres definitely not saying that is the only way to do it but this calculation has worked well for me so far
Hey 👋
hello
I have 10 fish, 12000, ltr, pond a pump that circulates all the water within the hour and a filtration box. Ie as a water fall but still getting algea 😅 4:42 4:42 4:42
Thanks for sharing, what do you think is your biggest problem why is the algae growing? do you have plants ua-cam.com/video/QSaKwUyHw6o/v-deo.html&pp=ygUNYWxnYWUgaW4gcG9uZA%3D%3D
The plants are now taking hold and growing iv noticed less algea in the pond. Iv all placed some foam over the filter system to collect the smaller particles and algea in the water it seems to be working
@@bindipper018 fantastic
My raised pond is 4x5 foot by 36 inch deep with 12 fish at roughly 6 inches
Goldfish tench n rudd
Nice
I've got 16 fish koi and a couple of orfs, some we've had nearly 20 years. Ponds 14x14 5ft
Perfect 👌🏻
I didn't hear here, or haven't seen in other pond channels: especially if you have smaller types of fish, I expect you then have to consider, 'when do I have too many fish and what do I do then?' I expect, if I were to get a handful or a dozen rice fish, or minnows, shouldn't I have to worry about them spawning and having fry? I can see if I had a koi or a feeder goldfish or three, there isn't a concern about them reproducing, but with smaller fish, I'm worried about possibly overfilling a pond (maybe in a couple/three seasons) if I have too many small fish in a small pond. Thoughts?
ua-cam.com/video/ehU9dmh0lL4/v-deo.html
ua-cam.com/video/MkUaxyyeiEc/v-deo.html
@@ThePondAdvisor , very good!! Thanks for pointing to this! One thing someone else suggested, to manage the number of fish is to id males (if possible) but get single examples of different species so there's less likelihood of them breeding. As well as, getting only 2 or 3 fish, decreasing the chance they'll breed. Thanks again!!
I’m from uk I might get one
Reach out any time, here to help
1 koi for every 250 gallon/1 000 litres they need space as well as filtration goldfish maybe 5
more space in a lot off cases, depends keeper to keeper
Iv got a 10ft by 6.6ft 2ft deep 3ft deep in center of the pond a little over 1,000 U.S gallons with a 2,000 gallon uv pump filter im putting lilly pads some water hyacinth and elephant ears in a pot on the shelf how many fish could I add like 5 koi? 2 koi and 15 goldfish? Or more
Nice 👍🏻
I have 3500 litres pond
And I build it two years ago and the koi where 15cm to 20CM the biggest
Now now some of the koi are 35CM to 40CM
7 koi’s with 4 goldfish
Next year I will make my pond bigger there getting to big for the pond 😎👌
So a 250 l small pond with a filter could have 7 or 8 gold fish ?
Depends on the size of the goldfish
@@ThePondAdvisor thank you
Depends on thr filtration more fish you need more filtration. Go to many and nature will take over and disease will kill some off. If your fish start dying yo many fish. I used to keep discus about 16 in a 300ltr tank. All grew big and lived a good 5 years, I had 2 big externals going and internal and single filters running off air pumps, great filters for qt tanks etc always mature bio then. I do the same with thr pond. Over filtrate . My ponds not very big its 14 x 14 and 5 ft at thr deepest.
Thanks for sharing your experience
I have a homade filter
Nice,
Approximately 1 ich of fish for every 10 gallons of filtered water... 1000 gallons approx 100 inches if it koi then as an approximate you'd need to filter for 2000 gallons... Over stocking a pond requires filtering for fish load (waste produced) apposed to water volume... Nice vid as well 👌
Thank you, I like this topic as it’s a large rule of thumb, no hard and fast rules, great guide lines. And then we open up the door is this the stocking rate or the mature rate. Why don’t the fish breed and then you have more. It’s a great topic, we just need to understand if you keep lots of fish and feed them a lot you will have more work to do!