Asian Fisheries Society

Effects of Stocking Density on Patterns of Reproduction and Growth of Hybrid Tilapia in Concrete Tanks in Saudi Arabia


ffects of four stocking densities (50, 100, 150 and 200 50 m -2) were investigated on some reproductive traits of hybrid tilapia (Oreochromis niloticus x O. aureus) in outdoor concrete tanks. For both sexes the gonadsomatic index was not significantly influenced by stocking density. Fast-growing fish mature early in the season (March), but spawning started late in May. Mean percentages of mature fish were significantly higher at stocking densities of 50-100 fish m -2 than at higher densities (150-200 fish m -2). No effect of stocking density on size of fish at first maturity was found. Fecundity per female decreased with increasing stocking density, though significant difference was found only between the lowest density (50 fish m -2) and other densities (100-200 fish m -2). The fecundity did not show any definite pattern, but it was highest for stocked at the lowest density. Final mean weight and feed conversion ratios were significantly influenced by stocking densities.

Publication Date : 1997-09-01

Volume : 10

Issue : 1

Page : 41-49

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Date 1997/09/01
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