Crescimento e sobrevivência larval do marisco Anomalocardia brasiliana (Gmelin, 1791) alimentado com diferentes dietas algais

Abstract

The present study describes the larval rearing of bivalve mollusc Anomalocardia brasiliana, with evaluation of different diets and stocking density. The diets were evaluated: microalgae Isochrisys galbana (Ig), Phaeodactylum tricornutum (Phaeo), Chaetoceros calcitrans (Cca), Pavlova lutheri (Pl) and combinations (Ig + Cca), (Ig + Phaeo) (Cca + Phaeo) and (Cca + Pl), totaling eight diets provided for a period of 15 days of cultivation. The microalgae I. galbana provided alone had lower survival and growth compared with other diets tested. The use of C. calcitrans and P. tricornutum alone or combined other microalgae showed highest values for survival and growth. The combined diet Cca + Pl, demonstrated the better growth and survival of larval A. brasiliana (261.67 ± 9.64 μm and 31.50 ± 0.87%). All diets evaluated with satisfactory results regarding the growth and survival of larvae of A. brasilaina except I. galbana diet when given alone. The stocking densities evaluated in post-larvae Anomalocardia brasiliana was 40, 80 and 160 ind.cm-2 in a trial period of 28 days. The density of 40 ind.cm-2 had the highest rate of daily specific growth. The highest survival of post-larvae were observed at lower densities 53.24 ± 4.60% (40 ind.cm-2) and 52.95 ± 3.32% (80 ind.cm-2), differing from greater stocking density with 31.54 ± 0.70%. So we concluded that we can produce larvae of A. brasiliana evaluated using any of the diets, except I. galbana was provided separately. In cultivation post-larvae of the same species must perform storage management in density during growth, density 160 ind.cm-2 can be used to achieve the larvae 600 μm in length, greater than 600 μm larvae must be grown at a density of 40 ind.cm-2 to keep the rate of maximum growth rate.