西江人工鱼巢增殖鲤鱼效果评估

2015~2016年在西江郁南、云安和高要江段开展了人工鱼巢增殖鲤鱼的实验工作,通过实施期间鱼巢粘附鱼卵数量以及同期鲤鱼资源状况调查对其增殖效果进行了评价。结果表明:两年人工鱼巢分别粘附鱼卵量达4.78亿粒和4.66亿粒,粘附鱼卵孵化出膜后统计全部为鲤鱼,按照自然水体鲤鱼苗的成活率5%计算,两年分别可增殖鲤鱼苗2 120万尾和2 020万尾,实现渔业捕捞经济效益增长达1 272万元和1 212万元。实践证明:选择好适宜的鱼巢投放位置和下水时间,保持鱼巢材料的新鲜能使人工鱼巢达到更好的效果,人工鱼巢是一种简单可行且易推广的鱼类增殖方法。

Effect evaluation of artificial fishnest on common carp (Cyprinus carpio) in Xijiang River

Artificial fish nest was carried out at Yu nan section, Yun an section, Gao yao section from 2015-2016, and the purpose was to increase the common carp resources. This paper evaluated the effect though counting adhesive fish eggs number and fishery catchment. The results showed that the artificial fish nest adhesive 478 million and 466million eggs in 2015 and 2016 respectively. And all of the fish egg hatched out common carp larvae. According 5% survival rate of natural river, it can supplied fish larvae 21. 2 million and 20. 2 million respectively, and can realized fisheries economic growth up to 12. 72 million and 12. 72 million. Practice proved that choosing appropriate fish nest location and release time, and keep-ing nest material fresh can make artificial fish nest was better effect, artificial fish nest is a kind of simple and easy to pro-mote fishery enhancement methods.