Valorisation du zooplancton produit en étangs de lagunage comme base pour l'alimentation de larves et juvéniles de cyprinidés

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Abstract
Some data concerning zooplankton production in domestic sewage treatment ponds are given: -physico-chemical characteristics of the water. -abundance fluctuation and harvestable biomass estimation. These values can constitute a basis for zooplankton prey production in other conditions. The protein and amino-acid composition of the biomass is discussed with reference to established nutritional needs of some fish species, with emphasis on the common carp (Cyprinus carpio). A growing test with experimental pellets having as unique protein source dried zooplankton, allowed us to assess a possible replacement rate of 40% of conventional proteins. A rearing trial of mirror carp larvae (0 to 4 weeks) fed with live zooplankton resulted in a survival rate of 70% and 99%, depending on the larvae and zooplankton densities, with an average individual weight of respectively 1.95 and 0.67 grams at the end of the experiment.

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