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Induced breeding of Hermymwres fossilis (Bloch.) was studied in laboratory aquaria. Quantitative and qualitative data on pre-mating, mating, and post-mating behaviour and related parameters were recorded. Among the pairs examined, 83% spawned successfully. Mating behaviour started between 6 and 15 h after administration of pituitary hormones. The number of enfoldings vaned from 25 to 350. Over 93% of the released eggs hatched within 21-24 h a t temperature 2431°C.