HOW TO HELP SHRIMP MOULT AND GROW BETTER |

Sharing here a session of questions and answers from Hong Kong shrimp farmers organized by City University of Hong Hong. Hope this is helpful to all, if so please give us a like and comment in appreciation to our efforts to share the science behind fish and shrimp farming.

[@banukumar444]

Sir my new bore water itself contains nitrite level as 0.09 mg/lit. & H2S as 0.02 mg/lit
Will those gases gets reduced after a long usage of bore ?
If not what should I do sir ?
Invested heavily on bore

[@hashtagfish8542]

Nitrite at this level not a problem, but H2S is big problem. Put water in aquarium and see if they kill shrimp

[@banukumar444]

@@hashtagfish8542 sir will addition of H2S eating probiotics from day 1 counter this problem ?

[@RaviKumar-pd4du]

Could you please suggest required alkanity and hardness of water per mg/liter and also the levels of calcium, magnesium, potassium and phosphorus?

[@hashtagfish8542]

Hi Ravi, as I mentioned in this and the main video, for alkalinity and hardness minimum of 150 mg/L. For others minerals, what is important is to keep the ratio between the main cations and anions as close as possible as the ratio found in seawater.. For more on this please read this article: www.globalseafood.org/advocate/revisiting-ionic-imbalance-in-low-salinity-shrimp-aquaculture/?headlessPrint=AAAAAPIA9c8r7gs82oW

[@banukumar444]

Sir is there any difference in applying sulphate based mineral salts vs chloride based mineral salts ?

[@hashtagfish8542]

Chloride usually dissolve faster

[@banukumar444]

Sir wont the movement of water due to paddle wheels help calcium sulphate to dissolve soon ?
Since its much cheaper than calcium chloride

[@gopichandanisetti603]

Dear sir can u plzz suggest the ways where we can decrease alkalinity if it was higher than optimal...?

[@hashtagfish8542]

Can you please tell us a reasonable situation where alkalinity would be too high? (You are probably scratching your head to answer this question because this situation does not exist in practice).

[@gopichandanisetti603]

@@hashtagfish8542 too high in the sense as mentioned in reports the optimal is 180-200 ppm. In some cases we are observing 270,340, even 400. At this particular alkalinity shrimp getting hard ,rough. Don't know how sure these symptoms that's bcoz of high alkalinity

[@hashtagfish8542]

@@gopichandanisetti603 are you using some kind of bore water? I've had up to 300 alkalinity with no problems farming over a calcium carbonate deposit, actually it is a blessing. But not 400.

[@hashtagfish8542]

It is never a single thing, what else do you know about the water chemistry?

[@gopichandanisetti603]

@@hashtagfish8542 s we are using only bore.