International Journal of Agricultural Policy and Research
Vol.3 (5), pp. 222-230,May 2015
Available online at https://www.journalissues.org/IJAPR/
Article 15/ID/JPR030/09/ pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Stock assessment of the bigeye grunt Brachydeuterus auritus (Valenciennes, 1832) in the coastal water of Ivory Coast
Kouadio Justin Konan1*, Tapé Gnahoré Toussaint Joanny1, Soumaïla Sylla1, Luaia Lianthuam2 and K Lohith Kumar3
1Centre de Recherches Océanologiques, 29, rue des pêcheurs-BP V 18 Abidjan, Côte d’Ivoire.
2Central Inland Fisheries Research Institute, Barrackpore-700120, India.
3Central Island Agricultural Research Institute, Port Blair, A & N Islands, 744101, India.
*Corresponding Author E-mail: konankouadjustin(at)yahoo.fr;kouadio.konan(at)cro-ci.org
Tel.: +225 07 62 52 71
Fax: +225 21 35 11 55
The stock assessment of Brachydeuterus auritus was carried out in the coastal water of Ivory Coast from January to December 2009. Monthly length frequency data were analyzed using FiSAT software and Jones’ Cohort Analysis Model for the estimation of population parameters, total biomass and Maximum Sustainable Yield (MSY). The asymptotic length (L∞) was 25.20 cm, the growth coefficient (K) was 0.58 year-1, and the calculated growth performance index (φ’) was 2.57. The total mortality (Z), the fishing mortality (F) and the natural mortality (M) were 2.01, 0.74 and 1.27 year-1,respectively. The exploitation level (E) was 0.37 while the maximum allowable limit of exploitation (Emax) was 0.85. The biomass was 2507 tons, which provided the MSY of 2079 tons. The recruitment pattern was continuous with two major peaks per year. The exploitation level (E = 0.37) and the fishing mortality approximated the precautionary target reference point (0.64 year-1) and was within the precautionary limit reference point (0.84 year-1), suggesting that the big eye grunt stock is exploited at a low rate.
Key words: stock assessment, growth parameters, MSY, bigeye grunt, Ivory Coast.