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中文摘要：
为r解斑尾复触虎鱼的渗透压调节机制，设置0．5、10、15、20、25、30、35、40、50共10个盐度组，采用外界盐度渐变的方法对该鱼幼鱼血清渗透压、血清离子浓度及鳃丝Na＋／K＋-ATP酶活力进行了检测和分析。结果昆示：在盐度0～50内，血清渗透压及血清离子含量均随盐度升高而升高，盐度为40—50时，血清渗透压及各离子含量均旺著高于对照组（盐度6）；在0～35的盐度中，血清渗透压及离子含量都保持相对稳定，在0盐度组，鳃丝Na＋／K＋-ATP酶活性最强，25和35盐度组的鳃丝Na＋／K＋-ATP酶活性比5～20和40～50盐度组的明显增强，25和35盐度组之间Na＋／K＋-ATP酶活性无显著性差异，5～20和40—50盐度组之间也均无显著差异，在盐度5～35内，鳃丝Na＋／K＋-ATP酶活性随外界盐度升高呈升高趋势；回归分析得到血清等渗点为0．308mol／kg，相对应的盐度为10．8；Na＋、C1-、K＋等离子点分别为340．28、137．08和4．51mmol／L，相对应的盐度分别为28．1、8．9和18．5。以上结果表明，斑尾复鳜虎鱼幼鱼对外界盐度变化有较强的适应性，属于广盐性鱼类，其盐度的耐受范围和适宜范围分别为0．3～35和5～15。
英文摘要：
Changes in plasma osmolality, concentration of ions （Na＋, C1, K＋） and gill Na＋/K＋-ATPase activity of goby （Synechogobius ommaturus Richardson） young fish were valued by gradually changing the medium salinity from 6 （control） to 0, 5, 10, 15, 20, 25, 30, 35, 40, and 50. The changes of both of the plasma osmolality and ions showed a similar trend, which increased with the increasing of medium salinity when the salinity was in the range of 0-50; the plasma osmolality and ions were significantly higher compared to the control group （salinity 6） and remained steady at salinity of 0-35. Na＋/K＋-ATPase activity reached its peak at the salinity of 0. Na＋/K＋-ATPase activities of goby youngfishes in groups with salinity at 25 and 35 were evidently stronger than those in groups with salinity range of 5-20 and of 40-50. There were no significant differences in Na＋/K＋-ATPase activities between 25 and 35 groups and the differences were also of no statistical significance in groups with salinity range of 5-20 and of 40-50. In salinity range of 5-35, the gill Na＋/K＋-ATPase activity increased with the ascending of the degree of salinity. Regression analysis showed the serum isosmotic point was 0.308 mol/kg, which corresponded to salinity 10.8. The isoionic point of Na＋, C1- and K＋ were 340.28 mmol/L, 137.08 mmol/L and 4.51 mmol/L, respectively, which corresponded to salinity 28.1, 8.9 and 18.5. The results indicated that the goby young fish might have a great capability of acclimation to salinity change. It tolerates salinities ranging from 0.3 to 35, and the optimal living salinities were in the range of 5 to 15.
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