Tito de Morais Luis. (2002). Fish population structure and its relation to fisheries yield in small reservoirs in Côte d'Ivoire. In :
Cowx I.G. (ed.). Management and ecology of lake and reservoir fisheries. Oxford : Blackwell - Fishing New Books, p. 112-122. ISBN 0-85238-283-9.
Titre du document
Fish population structure and its relation to fisheries yield in small reservoirs in Côte d'Ivoire
Année de publication
2002
Type de document
Partie d'ouvrage
Auteurs
Tito de Morais Luis
In
Cowx I.G. (ed.), Management and ecology of lake and reservoir fisheries
Source
Oxford : Blackwell - Fishing New Books, 2002,
p. 112-122 ISBN 0-85238-283-9
Lack of reliable data on the fisheries of northern Côte d'Ivoire reservoirs is a major limitation for management of the fish stocks. As individual reservoirs cannot be studied due to the high costs and lack of trained investigators, empirical and production models have to be used to evaluate exploitation rates and fisheries potential. Daily yield (DY, in kg fishing day-1 year-1) and total catch (TC, in kg year-1) appear to be better descriptors than annual yield (in kg ha-1 year-1). TC is related to variables linked to nutrient availability (watershed area, conductivity and Morphoedaphic Index). DY is related to fish species richness and to reservoir area, indicating that fish population structure could be a key to understanding the patterns observed. Correlation between fish population structure and yield was significant. It was hypothesised that overall catch, TC, is related to nutrient availability, but that catch per unit effort is related to the presence of given species in the reservoirs, and particularly to the presence of bottom feeding species.
Plan de classement
Poissons [034BIOVER01]
;
Stocks [040PECHE03]
Descripteurs
POISSON D'EAU DOUCE ; STRUCTURE DE POPULATION ; ESTIMATION DE STOCK ; GESTION DES PECHES ; PECHE ARTISANALE ; RESERVOIR ; LAC ; DISPONIBILITE EN NUTRIMENTS ; MODELISATION
