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Journal of Fisheries and Aquatic Science
Year: 2013  |  Volume: 8  |  Issue: 1  |  Page No.: 257 - 260

Relationship among Tilapia guineensis Fingerlings Abundance and Water Quality Variations in a Brackish Water Reservoir in Lagos

P.U. Uzukwu, A.A. Aranyo and C.O. Uzukwu    

Abstract: In recent times, there has been an upsurge in the culture of tilapia in Nigeria resulting in increased demand for the fingerlings which is hardly satisfied. This is due to increasing demand for table size tilapia as food fish and under-sized tilapia in the fish meal and fish canning industries in Nigeria. Collection of Tilapia guineensis fingerlings from the wild, to augment hatchery production has been the practice and this is subject to environmental fluctuations. Multivariate regression and correlation analyses of accumulated data were used to investigate the effects of changes in water quality parameters on abundance of fingerlings of Tilapia guineensis in a brackish water habitat in Lagos. Dissolved Oxygen (DO), salinity and Secchi transparency were found to be the most dominant factors affecting the abundance of Tilapia guineensis fingerlings in the Lagos lagoon. Peak period of abundance was closely associated with period of low salinity (0.50 to 5.60 ‰), which coincided with the period of low transparency and low DO in the rainy season. The correlation analyses of Tilapia guineensis fingerlings with the water quality parameters yielded the following correlation coefficients (r)-0.598; (salinity); -0.644 (transparency); -0.710 (DO); -0.566; (temperature) and 0.129 (pH). The abundance of Tilapia guineensis fingerlings in the Lagoon was ultimately defined by a suitable regression equation. This result is expected to optimize the collection of fingerlings of Tilapia guineensis from the wild and boost food fish security in Nigeria and elsewhere.

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