摘要
在室内自然降温条件下，研究了三个品系尼罗罗非鱼（吉富品系，“７８”品系，“８８”品系）对低温的耐受力，计算得出每个品系的半致死低温，并对降温过程中尼罗罗非鱼行为活动的变化进行了观察。试验结果表明，在上海地区，当温度降低到１１℃时，罗非鱼开始死亡，到７．４℃时，全部死亡。吉富罗非鱼死亡温度范围是１１℃～８．４℃，“７８”品系是９．８℃～７．４℃，“８８”品系是１１℃～７．４℃。对三个品系半致死低温的研究表明，吉富品系对低温的耐受力较弱，而“７８”与“８８”
Tolerauces of three strains of O. niloticus ( GIFT、“78”, “88” ) to low temperatures naturally decreased were studied and the lowest lethal temperatures of 50% individuals were calculated. Meanwhile, behaviours of these tilapias under temperature decreasing were observed. It was found that tilapias began to die when temperature reached 11℃ and died out under 7.4℃. Low lethal temperatures ranged from 11℃ to 8.4℃ for GIFT strain, from 9.8℃ to 7.4℃ for “78” strain and from 11℃ to 7.4℃ for “88” strain. Comparison Between lethal temperatures of 50% individuals of three stains indicated that tolerance of GIFT strain to low temperature was worse than the other stains, and there was no significant difference between “78” strain and “88” strain.
出处
《水产科技情报》
1996年第5期195-198,203,共5页
Fisheries Science & Technology Information
基金
亚洲发展银行(ADB)赞助
