A fatal problem with my Tilapia

[virgileli]

Hi guys, I am new to this forum and come from Borneo.

I have tried reading through several articles and also tried using the search feature but couldn't find the answers. Something is happening to the Tilapia in my fish pond and they're all DYING! I have a total of 1000 Tilapia in the pond and have no experience before this in aquaculture. I've only read guides from sources online to growing them. So far nearly 100 of them have died. I dont know if the source is from poisoning or disease. The smaller ones are dying first but now some bigger ones (around 1kg) have started dying as well. They all have a bluish spot near the gill if viewed externally. Upon inspecting the dead fishes gills, there seems to be some kind of brown mould or growth. I have some photos but don't really know how to upload them here yet.

Any fast response is greatly appreciated as the fatality count daily is about 20-30 of them :/

Thanks guys :)

[Diana]

Do you have any tests showing what the water parameters are?

I would be particularly concerned about ammonia or nitrite. Very low levels can lower the fishes immunity and leave them susceptible to diseases or parasites.

Spots like you describe on the gills might be something like Aremonas, Flavobacteria, or other disease.

[dwaink]

msfmail@morningstarfishermen.org
Hans Geissler may have the information you need, they have been teaching a man to aquaculture for decades(tilapia), i recently queried him about about collection locations for L260, but he had no information for me. This however is exactly what he does.

[J.B.]

Is this a man-made pond, or a naturally occurring body of water that you stock?

Either way, check out this article and see if anything rings true in your case. I've personally seen a pond (small lake) experience the phenomenon of "turning over", as described in this article, and it wiped out hundreds of the fauna in a very short time.

Oxygen in a Pond

[siregar]

Sir you need keep your pond have maximized dissolved oxygen. I suggest you use surface aerator such as TurboPro Jet Aerator

http://www.isw.co.id/turbo-pro-aerator-eng

TurboPro Jet Aerator to dissolve oxygen into water and release the content of gases dissolved in the water, TurboPro Jet Aerator remove oxidation of iron and manganese in the water. TurboPro Jet Aerator play vital role to reduce ammonia in water through nitrification. One of the most efficient type of aerator for reliable aeration processes in your pond is TurboPro Submersible Aerator.
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TurboPro Submersible Aerator uses stainless steel materials result in Anti-Corrosion. Can be applied on fresh water, sea water and wastewater. TurboPro Jet Aerator increases the level of dissolved oxygen in pond or water area on high density.

Turbo Jet Aerator is specifically designed to have parts like the head pipe which serves to suck oxygen from the surface. Impeller found on Turbo Jet driven by water currents, and because of its shape like a blade, the oxygen is sucked quickly broken down into tiny air bubbles.TurboPro Jet Aerator pushes the air into the water at high speed.
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Compared with other types of aerators, such as paddle wheel aerator or diffuser, TurboPro Jet Aerator reaches a wider availability of oxygen. Distance of spraying oxygen is also more extensive.

[Crazygar]

Or any type of water movement to keep dissolved O2 high.

We still haven't heard back from the original Poster as to conditions yet so it'll be hard to diagnose.

Gary