长江刀鲚亲鱼强化培育及自然产卵规律研究

试验研究了人工饲养条件下长江刀鲚亲鱼培育的水温及主要水化学指标、饵料投喂策略及经强化培育后刀鲚自然产卵的规律。结果表明，刀鲚亲鱼培育池周年水温变化范围为5-34℃，刀鲚常年摄食，采用“鲮鱼苗+细足米虾”的系列活饵进行饲育期、越冬期、促熟期分阶段的投喂策略，雌性亲鱼强化培育后成熟系数可达16.5%，发育较佳，总体成活率为97.6%。5-6月是刀鲚产卵的高峰期，产卵时间集中在20:00-20:30，受精率为80%-92%，试验期间收集刀鲚受精卵56.9万粒。刀鲚的产卵与水温关系密切，最适产卵水温为20-28℃。

INTENSIVE CULTURE AND NATURAL SPAWNING OF BROODSTOCKCOILIA NASUS UNDER ARTIFICIAL FEEDING CONDITIONS

The current study investigated water temperature, chemical factors of water quality, feeding regime, and the natural spawning mechanism ofCoilia nasus under intensive culture conditions. Results revealed that water tempera-ture of culturing broodstock ofC. nasus in one year was ranged from 5℃ to 34℃. The maturation rates of female broodstock reached to 16.5% while fish were fed with live fry ofCirrhinus molitorella andCaridina nilotica gracilipes, and reared with specific feeding regime during their growth periods including enhanced cultivation, over winter and in-duced mature. The average survival rate of the females reached 97.6%. Fish spawning time were mainly at 20:00—20:30 for a peak season from May to June. The fertilization rates ranged from 80% to 92%. A total of 569000 eggs were collected during this experiment. Results indicate that water temperature is the key factor toC. nausu spaw-ning, and the optimal water temperature forC. nasus to spawn were 20℃ to 28℃ .