Unequal abundance as a result of unequal vulnerability of species to the gears deployed by Artisanal Fishers in South-western Marine Waters of Côte d’Ivoire, West Africa

Paper Details

Research Paper 01/10/2021
Views (263) Download (16)
current_issue_feature_image
publication_file

Unequal abundance as a result of unequal vulnerability of species to the gears deployed by Artisanal Fishers in South-western Marine Waters of Côte d’Ivoire, West Africa

Laurent Bahou, Soumaïla Sylla, Konan Gervais N’zi, Célestin Atsé Boua
J. Bio. Env. Sci.19( 4), 63-72, October 2021.
Certificate: JBES 2021 [Generate Certificate]

Abstract

Catch data derived from artisanal fishery and collected from October 2017 to December 2018 have been used to estimate sixty-four fish and other fishery resources abundance in connection with the fishing gears with which they had been caught. These gears deployed in continental shelf waters of Côte d’Ivoire by the fishers included the drifting gillnet, stationary gillnet, bottom gillnet, beach seine, purse seine and longline. The results indicated differences in the abundance of each species relating to the gear type. Some species were caught with one fishing gear while others were vulnerable to at least two gears. Additionally, some pelagic species, of which the Sardinellas (e.g. Sardinella aurita Valenciennes, 1847 and S. maderensis (Lowe, 1839)), accounted for the principal species with higher abundance. The drifting gillnet and purse seine proved to be the fishing gears that caught the most specimens, cumulating 43.24% and 34.54% of total number of species landed, respectively. Catches with longline were however more diversified, spanning the pelagic to bottom species. The study also described the environmental conditions of these species through the change in temperature and phytoplankton abundance due to the change in season, which indirectly contributed significantly to varying abundance of species.

VIEWS 16

Allan JD. 1995. Stream Ecology: Structure and Function of Running Waters. Chapman and Hall. London, Nature 328 p.

Bahou L, Konan KJ, Amandé MJ, Diaha NC. 2018. Diet of the Atlantic sailfish Istiophorus albicans (Latreille, 1804) caught in Coastal marine waters of Côte d’Ivoire, West Africa. International Journal of Research in Biosciences 7 (4), 1-7.

Bahou L, Koné T, NDouba V, NGuessan KJ, Kouamélan EP, Gouli GB. 2007. Food composition and feeding habits of little tunny (Euthynnus alletteratus) in continental shelf waters of Côte d’Ivoire (West Africa). ICES Journal of Marine Science 64 (5), 1044-1052.

Bahou L. 2020. Effectiveness of Catches from Various types of Gears for the estimation of Biodiversity in southwestern Côte d’Ivoire, West Africa. International Journal of Biosciences 17(5), 23-33.

Belvèze H. 1984. Biologie et dynamique des populations de sardine (Sardina pilchardus. Walbaum) peuplant les côtes atlantiques marocaines et proposition pour un aménagement des pêcheries. Thèse de Doctorat d’Etat, Université de Bretagne Occidentale 532 p.

Binet D. 1982. Influence des variations climatiques sur la pêcherie des Sardinella aurita ivoiro-ghanéennes : relation sécheresse – surpêche. Oceanologica Acta 5(4), 443-452.

Binet D. 1993. Zooplancton néritique de Côte d’Ivoire. In : Le Loeuff P, Marchal E, Amon Kothias JB, Ed, Environnement et Ressources aquatiques de Côte d’Ivoire. 1. Le milieu marin. ORSTOM, Paris 167-193.

Binet D. 1995. Hypotheses accounting for the variability of Sardinella abundance in the northern Gulf of Guinea. In: Bard FX, Koranteng KA, Ed, Dynamics and Use of Sardinella Resources from Upwelling off Ghana and Ivory Coast. Acts of DUSRU Meeting, Accra, 5-8 October 1993. Collection Colloques et Séminaires, ORSTOM, Paris 98-133.

Cury P, Roy C. 1987. Upwelling et pêche des espèces pélagiques côtières de Côte d’Ivoire : une approche globale. Oceanologica Acta 10(3), 347-357.

FAO. 2008. Vue générale du secteur des pêches nationales : la République de Côte d’Ivoire. 42 p.

Fréon P. 1988. Réponse et adaptation des stocks de Clupéidés d’Afrique de l’Ouest à la variabilité du milieu et de l’exploitation. Analyse et réflexion à partir de l’exemple du Sénégal. Éditions ORSTOM, Paris 287 p.

Garcia SM, Zerbi A, Alioume C, Do Chi T, Lasserre G. 2003. The ecosystem approach to fisheries, issues, terminology, principles, institutional foundations, implementation and outlook. FAO Fisheries Technical Paper No. 443. Rome, FAO. 2003, 71 p.

Garcia SM. 1984. Les problèmes posés pour l’aménagement des ressources instables. Conférence présentée lors de l’atelier DANIDA/FAO/COPACE sur l’aménagement et le développement des pêches. Santa Cruz de Ténériffe, 1-10/6/83. FAO, Rome, 30 p.

Hamley JM. 1975. Review of gillnet selectivity. Journal of Fisheries Research Board of Canada 32, 1943-1969.

Heins M, Godø OR. 2002. Fisheries-induced Selection Pressures in the Context of Sustainable Fisheries. Interim Reports (IR-02-022) on work of the International Institute for Applied Systems Analysis. April 2002. Schlossplatz 1. A-2361 Laxenburg, Austria. 24 p.

Huse I, Løkkeborg S, Soldal AV. 2000. Relative selectivity in trawl, longline and gillnet fisheries for cod and haddock. ICES Journal of Marine Science 57, 1271-1282. Doi: 10.1006/jmsc.2000.00813.

Hutchings JA. 2000. Collapse and recovery of marine fish. Nature 406, 882-885.

Kent EC, Kennedy JJ, Smith TM, Hirahara S, Huang B, Kaplan A, Parker DE, Atkinson CP, Berry DI, Carella G, Fukuda Y, Ishii M, Jones PD, Lindgren F, Merchant CJ, Morak-Bozzo S, Rayner NA, Venema V, Yasui S, Zhang HM. 2017. A call for new approaches to quantifying biases in observations of sea surface temperature. American Meteorological Society, August 2017.

Koranteng KA. 1995. The western Gulf of Guinea coastal upwelling – peculiarities, changes and fisheries implications. Review paper presented at the EU advanced study course on upwelling systems (Atlantic Ocean Eastern Boundary), Las Palmas, Gran Canaria, 14 July-11 August 1995.

Morales JS. 2014. Lien entre la Météorologie et l’abondance de phytoplancton dans l’océan à partir d’images satellites. Maîtrise en Environnement, Université de Sherbrooks, 61 p (+ Annexes)

Njoku EG, Barnett TP, Laurs RM, Vastano AC. 1985. Advances in Satellite Sea Surface Temperature Measurement and Oceanographic Applications. Journal of Geophysical Research 90 (C6), 11, 573-11, 586.

Pézénec O, Marchal E, Bard FX. 1993. Les espèces pélagiques côtières de Côte d’Ivoire, Ressources et Exploitation. In : Le Loeuff P, Marchal E, Amon Kothias JB, Ed, Environnement et Ressources Aquatiques de Côte d’Ivoire. 1. Le milieu marin. ORSTOM, Paris 387-426.

Reyssac J. 1993. Phytoplancton et production primaire dans les eaux marines ivoiriennes. In : Le Loeuff P, Marchal E, Amon Kothias JB, Ed, Environnement et Ressources aquatiques de Côte d’Ivoire. 1. Le milieu marin. ORSTOM, Paris 151-166.

Root RB. 1967. The niche exploitation pattern of the bluegray gnatcatcher- Ecological Monographs 37, 317-350.

Srinivasan UT, Watson R, Sumaila UR. 2012. Global fisheries losses at the exclusive economic zone level, 1950 to present. Marine Policy 36, 544-549.