Effects of sodium chloride supplementation for Pacific white shrimp Penaeus vannamei diets, cultured in low salinity waters / Efeitos da suplementação do cloreto de sódio em rações para o camarão branco do Pacífico, Penaeus vannamei, cultivado em águas oligohalinas
DOI:
https://doi.org/10.34117/bjdv5n12-391Keywords:
Shrimp, low salinity water, dietary modification, haemolymph osmolality.Abstract
The culture of Penaeus vannamei in low-salinity waters is a recent development in Brazilian Northeast. The purpose of this study was to investigate the effects of NaCl dietary supplementation on shrimp growth, survival, haemolymph osmolality and total hemocyte counts. In trial 1, earthen pond-reared shrimp ranging from 5 to 20 g were sampled at intervals for determination of haemolymph osmolality. Haemolymph osmolality was not influenced by the increased weight of shrimp. Juveniles shrimp (5-20 g) haemolymph osmolality were then evaluated 24 h after they had been transferred from pond water (0.5 ppt) to the seawater (35 ppt). Shrimp haemolymph osmolality increased with external salinity and ranged from 661.0 ± 25.2 mOsm/kg (D1) and 916.9 ± 40.1 mOsm/kg (D4). In trial 2, shrimp reared in low-salinity water (0.3-0.5 ppt) were distributed into five groups (control, D1, and treatments, D2, D3, D4 e D5) with four replicates. Diets consisted of the basal diet supplemented with 0 g/kg, 5 g/kg, 10 g/kg, 20 g/kg, and 40 g/kg of NaCl, respectively. After 22 days, differences in survival, final weight, specific growth rates (SGR) and absolute growth rate (AGR) among treatments were significant. However, there were no significant trends in haemolymph osmolality and shrimp total hemocyte counts within the five tested groups.
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