The Tolerance of Eel Anguilla rostrata from Central America to Several Ecological Factors
中美洲原产地鳗鲡苗种对几种生态因子的耐受性研究

This experiment was designed to investigate the tolerance of Anguilla rostrata from Central America to several ecological factors such as water temperature,pH,dissolved oxygen,light intensity and acute toxicity of ammonia and nitrite.The results showed that appropriate water temperature for A.rostrata was from 20 to 28℃,with upper critical temperature 38℃ and lower critical temperature 0℃.The critical value of dissolved oxygen concentration for normal activity of A.rostrata was 1.00 mg/L,and the half suffocation value was 0.70 mg/L.Appropriate pH value varied from 4 to 10,with upper critical limit 11 and lower critical limit 3.24 h,48 h,72 h and 96 h LC50 of nonionic ammonia to A.rostrata were 4.54 mg/L,4.08 mg/L,4.08 mg/L and 2.62 mg/L respectively,with its safe concentration 0.262 mg/L.24 h,48 h,72 h and 96 h LC50 of nitrite to A.rostrata were 92.05 mg/L,65.81 mg/L,45.54 mg/L and 37.06 mg/L respectively with its safe concentration 3.71 mg/L.In addition,the threshold value of light intensity causing inquietude of A.rostrata was 5.88 μE/m2·s.