Growth and exploitation parameters of ladyfish Elops lacerta Valenciennes, 1847 in the Ivorian's exclusive economic zone, Cí´te d'Ivoire

Angelina Gbohono Loukou; Soumaí¯la Sylla; Olivier Assoi Etchian; Ida Akissi Konan; Célestin Boua Atse

doi:10.22034/ijab.v9i6.1362

Authors

Angelina Gbohono Loukou
[email protected]
Université Nangui Abrogoua, Laboratoire de Biologie et Cytologie Animale, UFR-SN, 02 BP 801, Abidjan 02, Cí´te d´Ivoire. http://orcid.org/0000-0003-4502-3268
Soumaí¯la Sylla Centre of Oceanology Research, B.P.V 18 Abidjan, Cí´te d'Ivoire.
Olivier Assoi Etchian University Nangui Abrogoua, Formation Unit and Research of Nature Sciences, Laboratory of Biology and Animal Cytology, 02 BP 801 Abidjan 02, Cí´te d'Ivoire.
Ida Akissi Konan Centre of Oceanology Research, B.P.V 18 Abidjan, Cí´te d'Ivoire
Célestin Boua Atse University Nangui Abrogoua, Formation Unit and Research of Nature Sciences, Laboratory of Biology and Animal Cytology, 02 BP 801 Abidjan 02, Cí´te d'Ivoire

Vol. 9 No. 6 (2021): December

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January 13, 2022

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West African ladyfish, Elops lacerta is a pelagic fish present in the coastal waters of West Africa from Mauritania to Angola. This study is conducted to provide data on the growth and exploitation parameters of E. lacerta important for the management and conservation of this species in the Ivorian's Exclusive Economic Zone (EEZ). These parameters were estimated by the indirect method using length frequency data collected in the Ivorian's EEZ during January 2019 to December 2020. Monthly length frequency data were analyzed by FiSAT II software. A total of 865 specimens were examined. The growth parameters from von Bertalanffy growth function (VBGF) estimations were Lâˆž = 60.38 cm fork length, K = 0.39 year^âˆ’1, and t₀ = 0.46 year. The estimated potential longevity (t_max) was 7.69 years. The exploitation parameters showed that the total mortality rate (Z), natural mortality rate (M) at 28.35°C and fishing mortality rate (F) were 1.57 year^âˆ’1, 0.80 year^âˆ’1 and 0.77 year^âˆ’1, respectively. The exploitation rate (E = F/Z) was 0.49. This value is lower than the optimal exploitation value (E₅₀), thus expressing a case of under-exploitation of the species in the Ivorian's EEZ. The size of first capture (Lc) below the size of first sexual maturity (FL₅₀) and the optimal size of capture (L_opt) requires the implementation of an adequate mesh size management policy to allow fish to reproduce several times before being captured.

Loukou, A. G., Sylla, S., Etchian, O. A., Konan, I. A., & Atse, C. B. (2022). Growth and exploitation parameters of ladyfish Elops lacerta Valenciennes, 1847 in the Ivorian’s exclusive economic zone, Cí´te d’Ivoire. International Journal of Aquatic Biology, 9(6), 360–369. https://doi.org/10.22034/ijab.v9i6.1362

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