Effects of sodium chloride supplementation for Pacific white shrimp Penaeus vannamei diets, cultured in low salinity waters

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.

Penaeus vannamei nursery in a synbiotic system: Effects of different forms of artificially salinized in low-salinity water

“…In addition, the shrimp culture in low salinities with an inappropriate ionic pro le can lead to lower shrimp performance, such as poor survival, reduced growth and/or high feed conversion ratio (Diaz et al 2001;Li et al 2017;Ye et al 2009), which can be minimized by adjusting the mineral supplementation (Ca, Mg, Na and K) so that the water in low salinity becomes similar to the proportions of ions (cations and anions) found in seawater, even with the culture of this species in waters with salinities below 0.5 g L − 1 (Moraes et al 2020).…”