Changes in growth and osmoregulation during acclimation to saltwater in juvenile Amur sturgeon Acipenser schrenckii

文献类型： 外文期刊

第一作者： Zhao Feng

作者： Zhao Feng;Zhuang Ping;Zhang Longzhen;Hou Junli

作者机构： Chinese Acad Fishery Sci, E China Sea Fisheries Res Inst, Minist Agr, Key & Open Lab Marine & Estuarine Fisheries Resou, Shanghai 200090, Peoples R China

关键词： sturgeon;serum osmolality;ion concentration;Na(+)/K(+)-ATPase activity;chloride cells

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 2019影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2010 年 28 卷 3 期

页码：

收录情况： SCI

摘要： We evaluated the ability of juvenile Amur sturgeon (Acipenser schrenckii) to osmoregulate and grow in saltwater. Hatchery-reared juveniles (mean weight 106.8 g, 5-month old) were transferred from freshwater to 10, 20, and 25 salinity saltwater over a period of 20 d. We measured the growth, serum osmolality, ion concentrations, and Na(+)/K(+)-ATPase activity. In addition, we prepared samples of gill tissue to quantify morphological changes in gill ultrastructure. Rearing in up to 25 saltwater for 30 d had no significant effect on growth. Similarly, serum osmolality and ion concentrations were similar to levels reported in other teleosts following acclimation to saltwater. Serum osmolality and Na(+),Cl(-) concentrations increased significantly with the initial increase in salinity. Afterwards, levels tended to stabilize and then decrease. Serum K(+) levels did not change during acclimation to saltwater. Gill Na(+)/K(+)-ATPase activity increased initially as salinity was increased. However, the activity later decreased and, finally stabilized at 3.7 +/- 0.1 mu mol P(i)/mg.prot.h in 25 saltwater (1.6 times higher than the level in those in freshwater). In fish that were held only in freshwater, the chloride cells were located in the interlamellar regions of the filament and at the base of the lamella. Following acclimation to 25 saltwater for 30 d, the number and size of chloride cells increased significantly. Our results suggest that juvenile Amur sturgeon is able to tolerate, and grow in, relatively high concentrations of saltwater.

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