改性粘土絮凝法对大西洋鲑(Salmo salar)存活及生理生化的影响初探

本文以平均体重为(388.00±41.11)g的大西洋鲑(Salmosalar)为实验对象,探究了改性粘土絮凝过程对养殖水体水质以及大西洋鲑存活、组织形态和氧化应激反应的影响。在本实验条件下,添加改性粘土的实验组水质得到一定程度的改善,其中磷酸盐、铵盐、亚硝酸盐浓度相较于对照组有明显降低的趋势(P0.05)。添加远高于现场可有效去除赤潮生物用量(4—10g/m~2)的改性粘土并没有导致大西洋鲑出现死亡现象,显微观察结果显示,实验组与对照组中大西洋鲑鱼鳃、消化道组织特征无明显差别。对大西洋鲑鳃、肝脏、消化道的丙二醛(MDA)含量、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性测定结果表明,改性粘土未对大西洋鲑造成显著的氧化胁迫(P0.05)。本研究结果说明,在远高于现场有效用量条件下,改性粘土未对大西洋鲑产生不良影响,该研究结果将为改性粘土治理有害藻华技术在国内外养殖海域的应用提供科学依据。

EFFECTS OF MODIFIED CLAY ON ATLANTIC SALMON (SALMO SALAR)

In this study, the effects of the modified clay on the water quality and the survival, tissue structure and oxidative stress of sub-adult Atlantic salmon were investigated. The results reveal that the addition of modified clay reduced the concentration of ammonium, nitrite and phosphate in the cultured water, and improved effectively the water quality. Compared with the control group, the addition of modified clay, which was much higher than the effective concentration in the field, did not cause the death of Atlantic salmon and damage of gill tissue and digestive tract tissue. The activities of superoxide dismutase (SOD) and catalase (CAT) showed no significant change against the control. The experimental results show that the modified clay did not have an adverse effect on the Atlantic salmon. This research provided a scientific basis for the application of modified clay to the treatment of the harmful algal blooms in domestic and foreign aquaculture areas.