Grass carp (Ctenopharyngodon idellus) is an economically important farmed fish. This experiment was conducted to study the effects of different culture salinities on the growth and muscle quality of grass carp. We found that salinity of 0 – 5 had no significant effect on the growth of grass carp, but it significantly decreased at salinities above 5. Compared to salinity 0, the protein content of serum was significantly higher at salinities of 3 and 5. However, all serum biochemical compound measured, except glucose and total protein, decreased significantly at salinity 9. Muscle textural properties of grass carp were significantly higher at salinities of 3 and 5 than at 0, 7, and 9. Salinities of 0 – 3 had no significant effect on muscle nutrition of grass carp, but this parameter tended to decrease at salinities above 7. Salinities of 3 and 5 significantly favored muscle growth and expression of collagen-related genes, whereas the opposite was true for salinities of 7 and 9. These results indicated that grass carp grew normally at salinities of 3 and 5, with some improvement in muscle quality, whereas salinities of 7 and 9 had a negative effect on growth and quality. Therefore, appropriate salinity levels can help to improve the muscle quality of grass carp without affecting their growth.

中文翻译：

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不同养殖盐度对草鱼生长和肌肉质量的影响


草鱼 （Ctenopharyngodon idellus） 是一种具有重要经济意义的养殖鱼类。本试验旨在研究不同养殖盐度对草鱼生长和肌肉质量的影响。我们发现 0 – 5 的盐度对草鱼的生长没有显着影响，但在盐度高于 5 时显着降低。与盐度 0 相比，盐度为 3 和 5 时血清的蛋白质含量显著升高。然而，除葡萄糖和总蛋白外，所有测得的血清生化化合物在盐度 9 时均显著下降。草鱼的肌肉质地特性在盐度为 3 和 5 时显著高于盐度为 0、7 和 9 时。盐度 0 – 3 对草鱼的肌肉营养没有显著影响，但当盐度高于 7 时，该参数趋于降低。盐度 3 和 5 显著有利于肌肉生长和胶原蛋白相关基因的表达，而盐度 7 和 9 则相反。这些结果表明，草鱼在盐度 3 和 5 时生长正常，肌肉质量有所改善，而盐度 7 和 9 对生长和品质有负面影响。因此，适当的盐度水平可以帮助改善草鱼的肌肉质量，而不会影响其生长。