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In nature, zooplankton is one of the primary foods of larval fish. Two of the dominant zooplankton groups are Rotifera (rotifers) and a sub-class of the Crustacea, Copepoda (copepods). These two groups are the preferred prey for shrimp and fish and are the live feeds used most often by culturists. The intensive larval culture of most marine fish depends on a large supply of zooplankton.
-SRAC Publication No. 701, Culture of Small Zooplankters for the Feeding of Larval Fish
Southern Regional Aquaculture Center