锶对大麻哈鱼稚鱼生长发育及肌肉ATP酶活性的影响

在实验室条件下，采用长期暴露的方法，研究锶（Sr2＋）对大麻哈鱼（Oncorhynchus keta）稚鱼生长、存活率和肌肉Ca2＋-ATP酶及N＋／K＋-ATP酶活性的影响。在水温（15±0．2）℃下，将体质量（0．389±0．021）g的大麻哈鱼饲养在可控温玻璃水槽（100cmX50cmX40cm）中。水槽中添加SrCl2·6H2O，使Sr2＋浓度达10、20、30和40mg·L^-1，以不添加锶的水槽为对照组。30d饲养表明，各实验组大麻哈鱼稚鱼均能生长，但高质量浓度的锶不同程度地抑制了大麻哈鱼稚鱼的生长和存活率，显著影响了稚鱼肌肉中Ca2＋-ATP酶和Na＋／K＋-ATP酶的活性。锶（sr2＋）质量浓度为10mg·L^-1时，各项生长指标和存活率最高；随着锶（Sr2＋）质量浓度的升高，Ca2＋-ATP酶和Na＋／K＋-ATP酶的活性下降。结果提示，大麻哈鱼稚鱼长期暴露的锶安全质量浓度在10mg·L^-1之内。

Effects of Strontium Ion on Growth and ATPase Activity in Muscle of Chum Salmon （ Oncorhynchus keta ） Juveniles

The effects of Sr2＋ on growth, survival and Ca2＋-ATPase, and Na＋/K＋-ATPase activities in muscle were studied in chum salmon （Oncorhynchus keta） juveniles in a laboratory. The chum salmon juveniles with body weight of （0.389±0.021 ） g were reared in a tank in which SrCl2·6H2O was added at a Sr2＋mass concentration of 0 （as a control）, 10 mg·L^-1, 20 mg·L^-1, 30 mg·L^-1 and 40 mg· L^-1 for 30 days with triplication at water temperature of （ 15 ± 0.2）℃. Results showed that the chum salmon juveniles in each experi- mental group grew within the range of exposure dosages, the maximal growth and survival in the case of Sr2＋ mass concentration of 10 mg·L^-1. The muscular Ca2＋-ATPase and Na＋/K＋-ATPase activities were found to be significantly inhibited by Sr2＋ ion, with the in- creased in the mass concentration of Sr2＋, Ca2＋-ATPase and Na＋/K＋-ATPase activities showing a downward trend. It is concluded that safe concentration of Sr2＋ ion for long term exposure is within 10 mg·L^-1 for chum salmon juveniles exposed to Sr2＋ ion.