Abstract
A series of trials on induced ovulation were conducted using female walking catfish to examine conditions of maturity under warm water conditions. For this purpose, females were maintained at 23-25°C for along period, either under 12L12D or natural photoperiod. Using 12-37 month-old females, induction of ovulation was achieved with a single injection of HCG (0.2, 0.4, 0.8, 1.6, or or 3.2IU/g BW). In all the trials, HCG treatment succeeded in inducing ovulation at dosages of 0.4IU/g BW or higher. Oocytes larger than 770μm responded to HCG and ovulated. These results indicate that female walking catfish can maintain conditions of maturity for an extended time under warm water conditions, and can respond to HCG irrespective of photoperiod.
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