Effects of stocking-density in flow-through system on the mussel Perna perna larval survival/Efeitos da densidade de estocagem em sistema continuo na sobrevivencia de larvas do mexilhao Perna perna

• Published in: Acta scientiarum. Animal sciences 2014-07, Vol.36 (3), p.247
• Main Authors: Turini, Caio Silva, Suhnel, Simone, Lagreze-Squella, Francisco Jose, Ferreira, Jaime Fernando, de Melo, Claudio Manoel Rodrigues
• Format: Article
• Language: Spanish
• Subjects: Analysis; Ecdysteroids
• ISSN: 1806-2636
• DOI: 10.4025/actascianimsci.v36i3.23685

This study evaluated the effects of larval densities, cultured in flow-through system, in the yield and quantity of larvae. The first experiment compared the larval yield of a flow-through system (80 larvae [mL.sup.-1]) and a batch system (8 larvae [mL.sup.-1]), which resulted in a higher yield and number of larvae in the flow-through system, after 23 days. The second experiment compared two larval densities (20 and 45 larvae [mL.sup.-1]) in flow-through system. The densities affected the yield after 15 and 23 days and the larvae final quantity after all tested times (8, 15, and 23 days). After 23 days of larviculture, the yield was highest for 20 larvae [mL.sup.-1] and the larval number for 45 larvae [mL.sup.-1]. The third experiment also compared two larval densities (100 and 150 larvae [mL.sup.-1]) in flow-through system. The larvae densities did not affect the yield and number of larvae for all tested times (8, 15, and 23 days). In general, the yield has reduced at higher larval densities. Therefore, considering the number of suitable larvae for settlement, the flow-through system was more efficient than the static system. However, in general, we observed reduced yield with high larval stocking-density in flow-through system. Keywords: bivalve mollusc, yield, larviculture, density. Este estudo avaliou os efeitos da densidade de larvas, no cultivo em sistema de fluxo continuo, na recuperacao e numero de larvas. O primeiro experimento comparou o rendimento de larvas de um sistema de fluxo continuo (80 larvas [mL.sup.-1]) e um sistema estatico (8 larvas [mL.sup.-1]), resultando um rendimento e numero de larvas mais elevado, apos 23 dias, para o sistema de fluxo continuo. O segundo experimento comparou duas densidades de larvas (20 e 45 larvas [mL.sup.-1]) em sistema de fluxo continuo. As densidades afetaram o rendimento apos 15 e 23 dias e a quantidade de larvas final nos tempos testados (8, 15 e 23 dias). Apos 23 dias de larvicultura, o rendimento foi maior para 20 larvas.[mL.sup.-1] e o numero de larvas para 45 larvas.[mL.sup.-1]. O terceiro experimento tambem comparou duas densidades larvais (100 e 150 larvas [mL.sup.-1]) em sistema de fluxo continuo. As densidades de larvas nao afetaram o rendimento e o numero de larvas para todos os tempos testados (8, 15 e 23 dias). Assim, considerando o numero de larvas capazes de assentar, o sistema de fluxo continuo mostrou-se mais eficiente do que o sistema estatico. Porem, em geral, observouse diminuicao do ren