Tasa de filtración e ingestión de Simocephalus vetulus (MüLLER, 1776) (CRUSTACEA: CLADOCERA) alimentado con Selenastrum capricornutum PRINTZ, 1914 Y Chlorella vulgaris BEIJERINCK, 1890

cladocera are microfiltering organisms, with a high potential to be used as alive food by diverse fish species, both in ornamental fish and intensive aquaculture. therefore it is important the study of filtration and ingestion rates of simocephalus vetulus (müller, 1776), fed with fresh water green algae selenastrum capricornutum printz, 1914 and chlorella vulgaris beijerinck, 1890 in concentrations of 4-500×104cel/ml. the highest ingestion rates (1.04-1.92×106cel/ind/h) were found in the highest densities of phytoplankton, of 3-5×106cel/ml, whereas highest filtration rates were obtained in the lower food concentrations, between 4 and 64×104cel/ml. regarding the type of phytoplankton, it was found that s. vetulus filtered greater volumes of water (8.96ml/ind/h), when it was fed with c. vulgaris than s. capricornutum (2.02ml/ind/h). also, a greater ingestion of cells of c. vulgaris (6.45×105cel/ind/h) than s. capricornutum (4.01×105cel/ind/h) was observed.