Growth, Mortality, and Longevity of Tilapia guineensis (Bleeker, 1852) in Tropical Man-Made Lake, Southwestern Nigeria | ||
| Egyptian Academic Journal of Biological Sciences, B. Zoology | ||
| Article 3, Volume 7, Issue 2, December 2015, Pages 33-38 PDF (210.37 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsz.2015.13470 | ||
| Author | ||
| Ayoade Adedolapo | ||
| Hydrobiology and Fisheries Unit, Department of Zoology, University of Ibadan, Oyo State, Nigeria | ||
| Abstract | ||
| Background: Fisheries resources are being depleted due to over-exploitation and inadequate information for planning and management; therefore, data on growth pattern, mortality, and exploitation rates of fisheries resources are essential for effective management and sustainable exploitation. Method: Growth parameters, mortality rates, and longevity of the Guinean tilapia, Tilapia guineensis, (Bleeker, 1852) in Asejire Lake were obtained from length composition data from January, 2013 to December, 2013. Results: The von Bertalanfy growth function estimates were: L∞ = 30.98 cm Total length, K = 0.37 year-1 and t0 = -0.441. Total mortality rate (Z)was 1.19 year-1, natural mortality rate (M) was calculated as 0.92 year-1 , fishing mortality rate (F) obtained was 0.27 year-1, and the exploitation rate (E) was 0.23. Growth performance index (ø) computed as 2.55. Conclusion: This result indicates low growth rate. The stock was not overexploited since exploitation rate was less than the optimal exploitation rate(0.5). | ||
| Keywords | ||
| Tilapia guineensis; von Bertalanfy growth function; Total mortality; exploitation rate | ||
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