Journal of Oceanography and Marine Science
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Article Number - D6B747164436


Vol.8(2), pp. 14-22 , May 2017
DOI: 10.5897/JOMS2017.0141
ISSN: 2141-2294



Full Length Research Paper

Growth and exploitation parameters of Ilisha africana, by-catch of the experimental fishing for the study on selectivity of gill nets for Ethmalosa fimbriata, in the Saloum estuary and Joal (Senegal)



Faye A.
  • Faye A.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar
Diouf M.
  • Diouf M.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar
Sarr A.
  • Sarr A.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar
Ndiaye W.
  • Ndiaye W.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar
Mbodj A.
  • Mbodj A.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar
Sow D.
  • Sow D.
  • Ecole Supérieure Polytechnique (ESP), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
  • Google Scholar







 Received: 07 February 2017  Accepted: 05 April 2017  Published: 31 May 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Growth and exploitation parameters Ilisha africana were determined from the size frequency for the first time in Senegal. The size distribution showed average sizes equal to 19.26 ± 1.70 and 19.75 ± 2.03 cm, respectively in the estuary and at the sea. The values of allometric rates of the length-weight relationship were, respectively equal to 2.88 and 2.93 in the estuary and at the sea indicating a negative allometric growth for this species. Von Bertalanffy growth parameters are estimated to L∞ = 24.7 cm, K = 0.33 year-1, t0 = -0.53 in the estuary and L∞ = 25.5 cm, K = 0.34 year-1, t0 = -0.51 at the sea with growth performance index, respectively equal to Φ' = 2.30 and Φ' = 2.34. The values calculated for the total mortality (Z), natural mortality (M) and the fishing mortality (F) were: Z = 1.08, M = 0.93, and F = 0.14 year-1 in the estuary while at the sea these mortality rates were estimated respectively at Z = 1.25, M = 0.91, and F = 0.33 year-1. The current exploitation rates in the estuary (0.10) and at the sea (0.25) indicated that I. africana was under-exploited in Senegal.

 

Key words: Allometric, mortality, Von Bertalanffy, condition factor.

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APA Faye, A., Diouf, M., Sarr, A., Ndiaye, W., Mbodj, A., & Sow, D. (2017). Growth and exploitation parameters of Ilisha africana, by-catch of the experimental fishing for the study on selectivity of gill nets for Ethmalosa fimbriata, in the Saloum estuary and Joal (Senegal). Journal of Oceanography and Marine Science, 8(2), 14-22.
Chicago Faye A., Diouf M., Sarr A., Ndiaye W., Mbodj A. and Sow D.. "Growth and exploitation parameters of Ilisha africana, by-catch of the experimental fishing for the study on selectivity of gill nets for Ethmalosa fimbriata, in the Saloum estuary and Joal (Senegal)." Journal of Oceanography and Marine Science 8, no. 2 (2017): 14-22.
MLA Faye A., et al. "Growth and exploitation parameters of Ilisha africana, by-catch of the experimental fishing for the study on selectivity of gill nets for Ethmalosa fimbriata, in the Saloum estuary and Joal (Senegal)." Journal of Oceanography and Marine Science 8.2 (2017): 14-22.
   
DOI 10.5897/JOMS2017.0141
URL http://academicjournals.org/journal/JOMS/article-abstract/D6B747164436

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