To determine the optimal temperature in rearing of fry stream groupers, Acrossocheilus fasciatus, a total of 540 fry fish with an initial body weight of (0.57 ± 0.16) g, and body length of (4.08 ± 0.40) cm were randomly distributed to 18 15-L tanks and reared at six different temperatures (12, 16, 20, 24, 26, and 28°C) for a period of 60 days. Fish were hand-fed to satiation under all six different temperature treatments. At the end of the experiment, almost all the growth, feeding, and gonadal development parameters were higher in the 26°C group than in the rest of the groups. As temperature increased from 12 to 26°C, the specific growth rate and feeding efficiency of fry significantly increased (p < 0.05). When temperature reached 28°C, these parameters were significantly lower than in the 26°C group (p < 0.05). The histological structure of the gonads showed that in the 26°C group, a large number of sperm cells resided in the testis in a free condition, and many yolk granules aggregated together and formed plates in the ovary. This histological information indicated that the gonadal maturity of fish in the 26°C group was higher than that of the other groups. Thus showing a turning point of growth, feeding, and gonadal development in the 26°C group. In relation to the nutritive compositions of muscle tissue, fish reared at 16°C exhibited the highest content of amino acids and fatty acids. These parameters significantly (p < 0.05) decreased as the temperature increased from 16 to 28°C. The proportion of essential amino acids (EAA/NEAA) and unsaturation of fatty acids (∑UFA/FA) did not show significant temperature influence (p > 0.05). In conclusion, increases in temperature significantly improved the growth rate, feeding performance, and gonadal development rate of fry A. fasciatus. Regression analysis based on growth and feeding performance showed that the optimal temperature of rearing fry A. fasciatus was 23.81–26.57°C.

中文翻译：

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温度对石斑鱼苗生长、摄食性能、性腺发育和肌肉营养成分的影响

为确定流石斑鱼鱼苗的最佳饲养温度，将初始体重（0.57±0.16）g、体长（4.08±0.40）cm的鱼苗540尾随机分配到18 15 -L 水箱并在六种不同温度（12、16、20、24、26 和 28°C）下饲养 60 天。在所有六种不同的温度处理下，对鱼进行人工喂食至饱食。实验结束时，26°C 组的几乎所有生长、摄食和性腺发育参数均高于其他组。随着温度从12°C升高到26°C，鱼苗的特定生长率和摄食效率显着增加（p  <0.05）。当温度达到 28°C 时，这些参数显着低于 26°C 组 ( p  < 0.05)。性腺组织学结构显示，26℃组睾丸内有大量精子细胞处于游离状态，卵巢内许多卵黄颗粒聚集在一起形成板状。该组织学信息表明，26℃组的鱼性腺成熟度高于其他组。由此可见26°C组中生长、摄食和性腺发育的转折点。就肌肉组织的营养成分而言，16℃饲养的鱼的氨基酸和脂肪酸含量最高。 随着温度从 16°C 升高到 28°C，这些参数显着下降 ( p < 0.05)。必需氨基酸比例（EAA/NEAA）和不饱和脂肪酸比例（ΣUFA/FA）没有表现出显着的温度影响（p  >0.05）。总之，温度升高显着提高了条带鱼苗的生长速度、摄食性能和性腺发育速度。基于生长和摄食性能的回归分析表明，带鱼苗的最适饲养温度为23.81~26.57℃。