A 90‐day experiment was conducted on Common Carp Cyprinus carpio in eight rectangular earthen ponds (21 × 10 × 1.50 m) for testing the effect of four groundwater salinities (0, 5, 10, and 15‰). At the end of the experiment, 100% survival was observed in all of the treatment groups. Somatic growth and reproductive performance were significantly (P < 0.05) influenced by salinity. Both males and females showed a significantly higher gonadosomatic index (24.46 ± 4.11% [mean ± SE]) at 5‰ (P < 0.05) compared with the fish that were kept in freshwater (15.92 ± 2.43%). The gonadal osmolality and osmolytes of the seminal and ovarian fluids increased in proportion to salinity. Ova diameter was inversely related to salinity. The incidence of spawning at 5‰ was significantly higher than at 0, 10, and 15‰. The gonadosomatic index was also significantly higher (30.15 ± 3.44%) at 5‰ followed by 0, 10, and 15‰, respectively. We concluded that the optimum salinity for the maturation of Common Carp is 5‰.

中文翻译：

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内陆盐渍地下水对鲤鱼生长，成熟和渗透调节的影响

在八个矩形土池（21×10×1.50 m）的鲤鱼鲤科动物上进行了为期90天的试验，以测试四种盐度（0、5、10和15‰）的影响。在实验结束时，在所有治疗组中均观察到100％的存活率。 盐度对体细胞生长和生殖性能有显着影响（P <0.05）。男性和女性在5‰（P时均显示出较高的性腺体指数（24.46±4.11％[平均值±SE]） <0.05）与淡水养鱼相比（15.92±2.43％）。精液和卵巢液的性腺渗透压和渗透压与盐度成正比。卵的直径与盐度成反比。5‰处产卵的发生率显着高于0、10和15‰处。性腺体指数在5‰时也显着较高（30.15±3.44％），其后分别为0、10和15‰。我们得出结论，鲤鱼成熟的最佳盐度为5‰。