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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