African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12487

Full Length Research Paper

Size composition, growth, mortality and yield of Alectis alexandrinus (Geoffory Saint-Hilaire) in Bonny River, Niger Delta, Nigeria

S. N. Deekae1, K. O. Chukwu1 and A. J. Gbulubo2
  1Department of Fisheries and Aquatic Environment, Rivers State University of Science and Technology, Port-Harcourt Rivers State, Nigeria. 2African Regional Aquaculture Centre, Port Harcourt, Nigeria. Institute for Oceanography and Marine Research, P.M.B.5122, Port Harcourt, Nigeria.
Email: [email protected]

  •  Accepted: 03 November 2008
  •  Published: 01 December 2009

Abstract

 

A twelve month study on the size composition, growth, mortality and yield of Alectis alexandrinus revealed a length range of 11.5 - 33.8 cm (standard length). Employing the length frequency method in the FISAT II package gave the following results for the Von Bertanlanffy growth parameters: L∞ = 35.23, K = 0.680, to = 0.3214 and Ç¿ = 2.926. The total mortality (Z) was 2.47, natural mortality (M) 1.39 and fishing mortality (F) 1.08.The relative biomass per recruit (knife edge selection) was Lc/ L∞ = 0.05, E10 = 0.355 and E50 = 0.278. Although the exploitation rate (E) was 0.44 the Emax was 0.421 indicating moderate exploitation of the fish in Bonny River. There is room for increased effort in the fisheries.

 

Key word: Size, growth, mortality, yield, Alectis alexandrinus.

Copyright © 2024 Author(s) retain the copyright of this article.

This article is published under the terms of the Creative Commons Attribution License 4.0

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