Journal of
Oceanography and Marine Science

  • Abbreviation: J. Oceanogr. Mar. Sci.
  • Language: English
  • ISSN: 2141-2294
  • DOI: 10.5897/JOMS
  • Start Year: 2010
  • Published Articles: 56

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.
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Diouf M.
  • Diouf M.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
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Sarr A.
  • Sarr A.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
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Ndiaye W.
  • Ndiaye W.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
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Mbodj A.
  • Mbodj A.
  • University Institute of Fishing and Aquaculture (IUPA), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
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Sow D.
  • Sow D.
  • Ecole SupĂ©rieure Polytechnique (ESP), Cheikh Anta Diop University (UCAD), Dakar, Senegal.
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  •  Received: 07 February 2017
  •  Accepted: 05 April 2017
  •  Published: 31 May 2017

Abstract

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.