盐度突变对半滑舌鳎血浆渗透压和鳃丝Na^+/K^+-ATP酶活性的影响

Effects of salinity on plasma osmolality and gill Na^+/K^+-ATPase activity of the tongue Sole(Cynoglossus semilaevis)

研究了半滑舌鳎(Cynoglossus semilaevis)由盐度30突变至0、10、20、35和40盐度后血浆渗透压和鳃丝Na+/K+-ATP酶活性的变化。结果表明,盐度对半滑舌鳎血液渗透压和鳃丝Na+/K+-ATP酶活性均有显著影响(P<0.05)。盐度突变后,各处理组的血液渗透压和鳃丝Na+/K+-ATP酶活性均随盐度的变化而相应地上升和下降,且其变化幅度与盐度的变化幅度直接相关。各处理组血液渗透压在经历盐度变化6 d内有峰值变化,峰值出现在2 d时,6 d后血液渗透压趋于稳定;而鳃丝Na+/K+-ATP酶活性在经历盐度变化9 d时调节至稳定状态,峰值则出现在6 d时,峰值大小亦与盐度的变化幅度正相关。本研究表明半滑舌鳎对盐度可能具有较强的适应能力。

Changes in plasma osmolality and gill Na＋/K＋-ATPase activity of the juvenile tongue sole（Cynoglossus semilaevis） were studied by abruptly shifting the of salinity from 30 to 0,10,20,35 or 40.The results showed that the effects of the salinity on plasma osmolality and activity of gill Na＋/K＋-ATPase of the fish were significant（P0.05）.The peak values of plasma osmolality appeared on day 2 after the changes of salinity,and the plasma osmolality in each group was stablized on day 6.The similar trends were observed in the changes of gill Na＋/K＋-ATPase activity.The peak values of gill Na＋/K＋-ATPase activity appeared on day 6 after the changes of salinity,and was dimished gradually to the stable leve1 at day 9.The results of this study indicated that the tongue sole might have a great capability of acclimation to different salinities.