The effects of five salinities (5, 10, 20, 30, and 35‰) on the survival, growth, body composition, oxygen consumption, and ammonia excretion of juvenile Spotted Scat Scatophagus argus (initial body size 3.3–3.4 cm body length and 2.0–2.3 g; final body size: 5.5–5.6 cm body length and 9.2–9.8 g) were studied. Salinity did not affect survival (>94%) or oxygen consumption rate (OCR) significantly, but it did affect growth, ammonia excretion rate (AER), and body composition. The growth rate was related to the combined effect of food intake (3.1–3.2%/d) and feed conversion efficiency (56.8–60.2%). The highest slope of the body length/weight with rearing time regression equation at 5‰ salinity was 0.0333/0.1137, which indicated that the growth rate of the fish at 5‰ salinity was higher than that of those at the other salinities for 70 d at 24.4 ± 0.4°C. The ammonia excretion rate decreased significantly with the increase of salinity. Low O:N ratios (5.6–19.2) occurred at salinities ranging from 5‰ to 35‰, indicating a protein‐dominated catabolism. Salinity affected crude protein content significantly, and high salinity was beneficial to protein deposition. The results indicated that juvenile Spotted Scat could adapt to a wide range of salinity, from 5‰ to 35‰. However, it is recommended that juveniles be cultured at low salinity (5‰).

中文翻译：

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盐度对斑点小S存活，生长，身体组成，耗氧量和氨排泄的影响

对存活，生长，身体组成，耗氧量，和少年的排氨5个盐度（5，10，20，30，和35‰）的影响斑点斯卡特金钱鱼（初始体重3.3-3.4厘米，体长2.0-2.3克；最终体重5.5-5.6厘米，体长9.2-9.8克）进行了研究。盐度不会显着影响生存率（> 94％）或耗氧率（OCR），但会影响生长，氨排泄率（AER）和身体组成。增长率与食物摄入量（3.1-3.2％/天）和饲料转化效率（56.8-60.2％）的综合影响有关。在5‰的盐度条件下，采用饲养时间回归方程的体长/体重的最大斜率是0.0333 / 0.1137，这表明在5‰的盐度下，70 d时鱼的生长速率高于其他盐度的鱼。 24.4±0.4°C。氨的排泄率随着盐度的增加而显着降低。盐度范围为5‰至35‰时，O：N比率较低（5.6-19.2），表明蛋白质占主导的分解代谢。盐度显着影响粗蛋白含量，高盐度有利于蛋白质沉积。结果表明，幼斑猫可以适应多种盐度，从5‰到35‰。但是，建议在低盐度（5‰）条件下培养幼鱼。