influência da alimentação no ciclo de vida da Moina micrura (crustacea: cladocera) em viveiros de peixe.

Abstract

The present work was a study of the life cycle of the cladoceran Moina micrura submitted to different food conditions, in unfertilized ponds and in ponds fertilized and innoculated with Scenedesmus sp. In the three untreated ponds, the. most abundant genera were Sphaerocystis sp, Dictyosphaerium sp, Peridinium sp and Staurodesmus sp considered inadequate as food for zooplankton. The three fertilized and innoculated ponds presented differences in the composition and abundance of algae, showing a clear dominance of Scenedesmus sp which is a more suitable food for zooplankton. Of the fourteen items evaluated in this study of the life cycle of Moina micrura, only two were not altered by the fertilization: Longevity, and Neonate survival. Fecundity and total number of neonates per female, were the most affected items in the enriched environment, which is very interesting in view of mass cultivation of Moina micrura. The results indicate that there is evidence of the participation of other groups of organisms such as bacteria, protozoans and fungi in the diet of Moina micrura.