Length-weight and length-length relationships and condition factors of 30 actinopterygian fish from the Mono basin (Benin and Togo, West Africa)

Lederoun D., Lalèyè P., Vreven E., Vandewalle P.

Date de parution: décembre 2016
Volume: 40
Number: 4
Pagination: 267-274
Editeur: Société Française d'Ichtyologie
doi: https://doi.org/10.26028/cybium/2016-404-001
Résumé

Based on their catches, this study describes the length-weight relationships (LWRs), length-length relationships (LLRs), and condition factors (K) of the 30 most common actinopterygian fish found in the Mono basin. A total of 6,591 specimens were caught, using multiple gears and fishing methods, between February 2011 and May 2014. The allometric b coefficient of the LWRs (BW = a × TLb) ranged between 2.650 for Polypterus senegalus and 3.468 for Awaous lateristriga with an average of 2.993 ± 0.177. Thirteen species had an isometric growth, seven species a negative allometric growth, and for the remaining ten species, growth was positive allometric. Regarding the LLRs, the coefficient of determination r2 was significant and ranged from 0.905 in Petrocephalus bovei to 0.999 in Parachanna obscura with an average of 0.973 ± 0.027. The condition factor (K = BW ⁄ TLb × 100) ranged from 0.406 ± 0.044 in A. lateristriga to 2.374 ± 0.805 in Lates niloticus, with an overall average of 1.145 ± 0.161.

Mots-clés: Actinopterygii - Condition factor - Length-length relationship - Length-weight relationship - Mono basin - West Africa
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