Induced spawning of the striped murrel Channa striatus using pituitary extracts, human chorionic gonadotropin, luteinizing hormone releasing hormone analogue, and ovaprim(r)

Striated murrel Channa striatus were injected with natu ral hormones (pituitary extract and human chorionic gonado tropin) and synthetic hormones (luteinizing hormone releasing hormone analogue and ovaprim). When compared to the LHRHap and ovaprim, the latency period was long in pitui tary(24 h) and HCG-injected (26 h) fish. In the pituitary injected C. striatus the percentage of fertilisation was the lowest (60-68%) but the duration of hatching was longest (39-43 h) followed by HCG(36-38h ), LHRHap(34-36 h) and ovaprim-injected (21-23 h) individuals. In terms of fer tilisation (95-98%) and hatching, ovaprim yielded better re sults. Ova reached the highest diameter (1.34-1.45 mm) in C. striatus injected with ovaprim, followed by HCG (1.22-1.30 mm) and pituitary (1.21-1.27 mm). The lowest ova diameter (1.07-1.09 mm) was observed in C. striatus injected with LHRHap.