非离子氨和氨氮对不同规格史氏鲟幼鱼的急性毒性及安全浓度评价

摘要

The acute toxicity and safety concentration of non-ionic ammonia and ammonia-N to juvenile Amur stur-geon Acipenser schrencki with body weight of (1. 7 ±0. 2) g (A1),(3. 6 ±0. 6) g (A2), and (10. 3 ±1. 5) g (A3) were studied at water temperature of (22±1)℃, pH 7. 6, and dissolved oxygen (DO) level of 7. 0-8. 0 mg/L. The results showed that there was a significant positive correlation between the median lethal concentration ( LC50 ) and safety concentration of non-ionic ammonia and ammonia-N levels and body weight of the Amur stur-geon juveniles. Under the experimental conditions, the 96 h LC50 of ammonia-N were found to be 5. 30 mg/L in A1,10. 20 mg/L in A2,and 12. 30 mg/L in A3,with safety concentration of 0. 53 mg/L in A1,1. 02 mg/L in A2, and 1. 23 mg/L in A3. The 96 h LC50 of non-ionic ammonia-N were found to be 0. 13 mg/L in A1,0. 26 mg/L in A2 , and 0 . 28 mg/L in A3 , with safety concentration of 0 . 01 mg/L in A1 ,0 . 03 mg/L in A2 , and 0 . 03 mg/L in A3 .%在水温为(22±1)℃、 pH为7.6、 DO为7.0~8.0 mg/L的条件下,对A1(1.7 g±0.2 g)、 A2(3.6 g±0.6 g)、 A3(10.3 g±1.5 g)3种不同规格的史氏鲟Acipenser schrencki幼鱼进行非离子氨和氨氮的急性毒性及安全浓度评价。结果表明：氨氮和非离子氨对史氏鲟幼鱼的半致死浓度( LC50)和安全浓度均与幼鱼的体质量呈正相关；氨氮对A1、 A2、 A3组史氏鲟幼鱼的96 h LC50分别为5.30、10.20、12.30 mg/L,安全浓度分别为0.53、1.02、1.23 mg/L；非离子氨对A1、 A2、 A3组幼鱼的96 h LC50分别为0.13、0.26、0.28 mg/L,安全浓度分别为0.01、0.03、0.03 mg/L。