摘要
对不同规格的鲤鱼苗进行了氨的急性毒性值测定。试验将全长0.94±0.07cm、2.21±0.11cm和3.58±0.25cm三种规格的鲤鱼苗分别同3组不同浓度梯度的氨溶液接触96,J’时,结果表明:①24小时的半致死浓度(LCs。)分别为0.361、0.966和1.361mgNH3-N/L,48小时的半致死浓度分别为0.300、0.865和1.324mgNH3-N/L,96小时的半致死浓度分别为0.282、0.778和1.262mgNH3-N/L。②试验持续48小时之后,氨的急性毒性明显减弱,其致死的浓度分别为0.285、0.794和1.265mgNH3-N/L。③氨对鲤鱼苗的安全浓度范围为0.028~0.126mgNH3-N/L,且0.94±0.07cm规格的鲤鱼苗对氨最为敏感。
A series of test of acute toxicity were taken for different sizes of fry of carp. Each 3 groups of fries with size of 0. 94±0. 07cm, 2. 21 ±0. 11cm and 3. 58± 0. 25cm respectively, were treated with 3 different concentrations of ammonia for96 hours. Results showed that NH324-hour LC50 was 0. 361, 0. 966 and 0. 36mgHN3-N/L respectivly. NH348-hourLC50 was 0. 300, 0. 865 and 0. 324mgNH3-N/L respectively. After contacting ammonia for 48 hours ammonia acute toxicityobviously weaken, and its lethal threshold concentration was 0. 285, 0. 794 and 1. 265mgNH3-N/L respectively. The resultshowed that the size of 0. 94±0. 07cm carp fries were most sensitive to ammonia.
出处
《西南农业学报》
CSCD
北大核心
1998年第2期80-85,共6页
Southwest China Journal of Agricultural Sciences