Abstract:
Effects of 4 levels of salinity (0.5, 10, 20 and 30 ppt) and 3 levels minerals supplement in feed (0%, 1% and 3%) on growth, molting period, survival rate, and strengthen, roughness, color and lister of cuticle of juvenile shrimp (Penaeus monodon) that cultured in concrete pond and in rarthen pond under low salinity were studied. In addtions, vaiations of osmolality, Ca, Mg, Na, Cl, K, P, Mn, Cu, S, protein, carbohydrate and glycosminoglycans concentrations in plasma and cuticle of shrimp were also exmined.The results showed that osmolality, concentrations of Ca, Mg, Na, Cl, K, P, Mn, Cu, S, protein, carbohydrate and glycosminoglycans in plasma and cuticle of P. monodon were significantly affected (P<0.05) by level of minerals supplement in feed. The level of salinity was limiting factor for the significant variations of these values. Furthermore, growth, molting period, survival rate, strengthen and roughness of cuticle (except for color and luster) were also affected (P<0.05) by the supplementation level of minerals in diet under different salinity. This indicated that minerals supplementation up to 3% in feed is necessary for low salinity shrimp culture (<10 ppt) and the supplementation level can be decreasing when cultured in higher salinity.