Abstract
The feasibility of photothermal treatment and use of salmon gonadotropin releasing hormone analogue (sGnRH-A) for induced spawning of Heteropneustes fossilis outside the spawning season was investigated. Fish were maintained at 30° C and 14 h light (L)/10 h dark (D) for 60 days between the post-spawning season and preparatory season. Fish attained gonadal maturity 4 months earlier compared to the natural spawning season. Mature fish were induced to spawn by D-Lys6 sGnRH-A at a dose of 25 μg kg−1 body weight. The eggs obtained were fertilizable. Injection of D-Lys6 sGnRH-A at different time points during the photodiurnal cycle did not influence the latency period and spawning of H. fossilis.
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