Effect of lipid levels on reproductive performance of Oreochromis karongae

摘要

A study was conducted at Bunda Fish Farm to evaluate the effects of dietary lipid levels on reproductive performance of Oreochromis karongae. Fish were reared in 12 hapas for 86days, with four experimental diets containing 8.28%, 10.17%, 12.09% and 14.05% levels of lipid, replicated three times. At the end of the experiment, O.karongae fed 10.17% and 12.09% lipid had the highest absolute fecundity (237.5 +/- 6.50 and 271.3 +/- 26.19, respectively) as compared with fish fed on 8.28% and 14.05% lipid levels (90.3 +/- 46.3 and 143.7 +/- 30.8 respectively). Higher number of spawns (5) were observed in fish fed on diets containing crude lipid of 10.17%. We can assume also that diets of 10.17% lipid are not costly as those of 12.09% or 14.05% lipid. It was found that the size of eggs depended on the number of eggs spawned by the female fish, as the number of eggs increased, the weight of eggs and mean egg diameter decreased. There were no significant differences (P>0.05) among treatments in terms of relative fecundity. Based on these findings, it is recommended that diets containing crude lipid of 10% should be fed to broodstock for optimum reproductive performance of O.karongae.