Length-mass relationship and condition factor are important tools used in biology, ecology and stock assessment for the management and conservation of fish populations and also to assess the level of disturbance of an aquatic ecosystem. The present study aims at providing baseline data on the length-mass relationship and condition factor of sixteen (16) fish species landed at NDènou, downstream of the Taabo dam, prior to the impoundment of the dam under construction on this part of the Bandama River. The fish were collected monthly from november 2019 to october 2020.They were measured (standard length in cm) and weighed (mass in g). The data were processed in Excel and Statistica 7.1 software. A total of 16047 fish were examined. The standard lengths of these fish varied from 3.50 to 40 cm with masses ranging from 2.87 to 1400 g. The values of the allometry coefficient ranged from 1.64 for Hemichromisbimaculatus to 2.99 for Labeocoubie. Fourteen (14) fish species studied have negative allometric growth (b < 3 p < 0.05). Distichodusrostratus and Labeocoubie species have isometric growth. The condition factor has values between 0.83 ± 0.39 (Mormyropsanguilloides) and 3.65 ± 0.74 (Coptodonhybrid).
Growth and mortality parameters, exploitation rates and annual recruitment patterns were estimated using FiSAT program from monthly length-frequency and weight samples of Distichodus rostratus captured from the hydrosystem located between the hydroelectric dams of Kossou and Taabo (Bandama River). Samples were collected from July 2004 to June 2005. The aim was to estimate growth parameters, mortality rates, exploitation rate and recruitment pattern of D. rostratus for sustainable management. The von Bertalanffy growth parameters asymptotic length L∞ (cm) and growth constant K (per year) were 69.30 and 0.27 respectively. Goodness of fit (Rn) was 0.27. The growth performance index (φ') value was 3.11. Age at maturity was estimated at 2.87 years for males and 3.78 years for females. The maximum age estimated was 11.095 years. The annual rate of fishing mortality (F = 0.10) was low compared to the relatively high natural mortality (M = 0.60). The exploitation rate (E = 0.14) shows that the species was not over-exploited in the Bandama River.
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