Recently we collected some yellow L. vannamei during harvesting in shrimp farm. Though numbers were small ( only 3-4 pieces), growth is similar to other normal color shrimps. What is the possible reason for change in coloration.
Does there any relation between iron and color pigments. Does such case are reported all over the world where L .vannamei culture is going on?
The body colour is also related to the food and feed taken. Stress or malnutrition could cause change in color or pigmentation process. However, as it is occurrence of fewest percentage, and growth is similar to normal shrimps, it may be different strain or resulted from some sort of gene expression ?? molecular diagnosis may help us!
we used to harvest such shrimps from our farm in Haryana. They grow to the same size as that of normal shrimp. Some American Researchers are working on it to develop a new strain called Golden vannamei. Some relate it to action of RPCH etc but until now its a Mystery, Sorry that we cant help you.
Cultured P.merguensis in Mundra shrimp cultured ponds showed more of yellow color than the one caught from wild,though the coloration was not that dark enough as shown in the picture.I my add one point here.In one shrimp culture pond in Valsad,before they transfer juveniles to a pond,they place a few of them in a small enclosed area overnight.Next day they look for the spots on the juveniles,if they have lessened,they ascertain that the quality of the water is not up to the mark & first they improve the quality & only transfer the juveniles.Probably food and/or quality of water may have something to do in your observations.
It is may be due to the Yellow Head Virus Disease. As the name suggests, cephalothorax of shrimps infected by YHV turn yellow. I only heard about this disease, i dont know much, sorry.
The possible reasons might be copper and or carotenoids - astaxanthin.
We received report of the yellow one now and then in Vietnam. They looked fine. I do not think it a disease. Probably some problem with pigmentation and only happened at individual level. Anway, we need to investigate it. Very interesting.
Astaxanthin is the main pigment in marine shrimps. But it seems that yellow color L. vannamei lacks astaxanthin pigments.
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