Advances in Fishery, Aquaculture and Hydrobiology

The effects of some stress conditions on the reproductive fitness of Clariasgariepinus


AigbogunT. A., AbiyeI. A. and EshanomiA. S.

Reproductive fitness of female brood stock of Clarias gariepinuswas determined using three different stress conditions; confinement and starvation for 12 hours before hormone injection; keeping fish out of water after hormone treatment (Latency period) and transportation. Broodstock of eight months old with an averageweight ranging between 450 and 750 g were used for the experiment. There was no significant different (p>0.05) in hatchability of eggs among the stressed conditions. Survivability of fry within twenty one days of hatching was also not significantly different (p>0.05) among the conditions. Whatever mortality observed in injected females was attributed to stress while fry mortality was due to cannibalism as a result of congestion. The result showed that female broodstock of C. gariepinuscan accommodate or withstand some level of stress beyond which damaging effects may be seen in the reproductive performance.


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