EFFECT OF SALINITY STRESS ON THE GROWTH, BODY COMPOSITION AND ENZYME ACTIVITIES OF JUVENILE HIPPOCAMPUS KUDA
盐度胁迫对大海马(Hippocampus kuda)幼体生长、组分及酶活力的影响

This article investigated effects of variable salinity stress (salinity 25 dropped rapidly to 5, 15, 35) on the growth, biochemical composition and enzyme activities in juvenile Hippocampus kuda. The results showed that weight, biochemical composition and energy value of H. kuda juvenile of 15 salinity group had no significant difference with the control group(salinity 25) (P>0.05), the indexes of growth and survival rates were significantly higher than those of the control group (P<0.05), however, the growth rate, survival rate and biochemical composition of the 5, 35 salinity groups were apparently lower than those of the control group (P<0.05), besides the SOD, CAT enzyme activities in 15 salinity group were lower than in the control group level (P<0.05), the changes of MDA content had no significance (P>0.05). The SOD, CAT and MDA contents of the 5, 35 salinity groups compared with the control group, which show rising trend with time elapse (P<0.05). With the increases of salinity, the AKP activityhas a rising trend, and opposite of the ACP activity.