Three trials were conducted to evaluate the performances of red snapper, Lutjanus campechanus, in low salinities. The median lethal concentration (96 h LC50) of salinity was determined by trimmed Spearman-Karber method using survival data of fish (18.9 ± 0.2 g) collected after 96 h from acclimation to 2, 4, 8, and 32 ppt salinities in 800 L tanks (n = 3), while the serum osmolality of fish (74.1 ± 3.9 g) was determined after 48 h from acclimation to 6, 8, 16, 24, and 32 ppt salinities in 150 L tanks (n = 3). The growth trial was conducted for 6 weeks in 800 L tanks to determine the growth and survival of fish (18.8 ± 0.2 g) at 8 ppt salinity compared to the control (32 ppt salinity). At the conclusion, the isosmotic point of fish was estimated as 357.2 mmol/kg (correspond to 11.0 ppt salinity), while the 96 h LC50 was estimated as 5.65 ppt salinity. No significant differences were noted for survival and FCR of fish reared in 8 and 32 ppt salinities. However, growth was significantly lower in fish reared in 8 ppt salinity compared to the fish reared in 32 ppt salinity. The reduced growth could be, at least partially, due to the increased osmoregulatory energy expenditure at lower salinities.

进行了三项试验以评估红鲷鱼Lutjanus campechanus在低盐度下的性能。盐度的中位致死浓度 (96 小时 LC50) 是通过修整 Spearman-Karber 方法使用从适应 800 L 中的 2、4、8 和 32 ppt 盐度 96 小时后收集的鱼的存活数据 (18.9 ± 0.2 g) 确定的罐 ( n  = 3)，而鱼的血清渗透压 (74.1 ± 3.9 g) 是在 150 L 罐 ( n = 3)。生长试验在 800 升水箱中进行了 6 周，以确定与对照（32 ppt 盐度）相比，8 ppt 盐度下鱼（18.8 ± 0.2 g）的生长和存活。最后，鱼的等渗点估计为 357.2 mmol/kg（对应于 11.0 ppt 盐度），而 96 h LC50 估计为 5.65 ppt 盐度。在 8 和 32 ppt 盐度下养殖的鱼的存活率和 FCR 没有显着差异。然而，与在 32 ppt 盐度下养殖的鱼相比，在 8 ppt 盐度下养殖的鱼的生长速度明显较低。生长减少可能至少部分是由于在较低盐度下渗透调节能量消耗增加。