不同时期黄颡鱼催产效果比较

Comparative Efficacy on Induced Spawning of Yellow Catfish(Pelteobagrus fulvidraco) during Different Periods

依据黄颡鱼性腺发育方面的相关研究和对武汉市周边湖泊天然水体黄颡鱼繁殖情况的调查与分析,表明黄颡鱼具有较长繁殖期,可以多次进行人工催产繁育。结合生产实际,分前、后不同时期对从武汉周边采集的黄颡鱼亲本进行了较为集中的规模化催产,并进行了效果比较。催产批量进行的时间段分别设在4月底至6月初和8月中旬至9月初。结果表明,后期相对产卵量少(P<0.01),所需催产剂量较低,只需一次注射,效应时间较短,并且催产率、受精率都明显低于前期(P<0.01)。后期人工繁殖的鱼苗经过培育,可作为来年成鱼养殖所需的大规格苗种,同样具有生产意义。

According to the studies on gonad development and investigation into practice about reproduction of yellow catfish(Pelteobagrus fulvidraco),there was a long breeding period of yellow catfish in the same year,which can be used to induce spawning artificially.In view of the production practices,two periods of late April to early June and mid-August to early September were set for mass cases to induce spawning.Comparative efficacy between the two periods on induced spawning were investigated in this study and the results showed that the egg production,rate of ovulation and level of fertilization were lower,less hormone and shorter time to spawn were required during the later period.The aim of the catfish propagation in the later period was to provide bigger size fry for culture purposes,with a great of production significance.