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19.1.1 Artificial larval feeds for shrimp hatcheries
There are different larval stages in shrimp viz., nauplii, protozoea, mysis and post larvae. In nature, the nauplii do not feed as it utilizes the yolk content in yolk sac. At protozoea stage the larvae normally feed phytoplankton of 3-10μ in size , while at mysis stage the larvae feed food of 30-100 μ in size, while at post larvae stage the larvae feed, food of till bigger in size. Mostly shrimp larvae take live feeds and it is believed that the live feeds help in getting more survival and growth. Recently the live feeds are substituted with the prepared feeds. Hatcheries continue to make their own larval feeds, because commercially available feeds are expensive and their quality and texture are varying a lot. Larval feeds are made for both freshwater prawns and marine shrimps. There are different types of feeds available for differet stages of larvae. Hatcheries use egg custard and micro encapsulated diets as a substitute for live feed. |
Last modified: Saturday, 24 December 2011, 9:55 AM