Resumo

SANTINON, J.J.; HERNANDEZ, D.R.; SANCHEZ, S.  e  DOMITROVIC, H.A.. Efecto de diferentes densidades de cría sobre el crecimiento y la supervivencia de Rhamdia quelen juveniles (Pisces, Siluriformes). Rev. vet. [online]. 2012, vol.23, n.1, pp.64-68. ISSN 1669-6840.

This study was conducted to assess the effect of stock density on growth and survival of juvenile Rhamdia quelen reared in a semi-intensive culture system. A total of 147 R. quelen with initial weight of 1.27 ± 0.45 g were placed at densities of 5, 10 and 20 fish/m3 (DI, DII and DIII, respectively) in nine experimental units. During a 47 days trial, fish were fed with a diet containing 35% of crude protein. Fish from DI showed a significant increase in weight gain compared to fish from DIII (p0.05). By contrast, the highest final biomass was obtained in DIII, differing significantly from DI, while individuals from DII did not differ significantly with the other groups. Survival rate was higher than 90% in all groups, showing no significant differences between treatments (p>0.05). These results indicate that the middle density would be the most appropriate to obtain acceptable growth parameters and high survival rates

Palavras-chave : Rhamdia quelen; feeding; density; growth; survival.

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