The relevance of size parameters as indicators of fishery exploitation in two West African reservoirs |
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Authors: | Justin Kantoussan Jean Marc Ecoutin Guy Fontenelle Omar Thiom Thiaw Luis Tito de Morais and Raymond La? |
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Institution: | (1) IRD, BP 1386, Dakar, Senegal;(2) Agrocampus Ouest, P?le halieutique, 65 rue St Brieuc CS, 84215 Rennes cedex, France;(3) IUPA Universit? Cheikh A. Diop, BP 5005, Dakar, Senegal;(4) IRD de Bretagne, BP 70, 29280 Plouzan?, France;(5) IRD, Centre de Recherches Halieutiques, Avenue J. Monnet, BP 171, 34203 S?te, France; |
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Abstract: | Fish communities living within the artificial reservoirs of Manantali and Selingue in Mali are compared after the monitoring
of small-scale fishery landings over 13 months (May 2002–June 2003). The fishing pressure constitutes the main difference
of these two similar reservoirs. The effects of fishing on the structure of the fish communities are analyzed by using fish
size spectra and derived indicators. In Selingue Reservoir, the fishing gears mostly target smaller species (mean length of
165 mm) than in Manantali Reservoir (mean length of 210 mm). Unlike in Selingue, the size structure does not change between
seasons in Manantali. In Selingue, fishing practices that target the fish recruitment of the year constitute a structuring
factor of the fish sizes observed in the catches. In spite of similar values of the slopes of the global fish communities’
size spectra between the two reservoirs, they clearly display an intense exploitation at Selingue. Then, size-based spectra
indicators represent a potential tool for assessing the impact of fishing on fish communities in small-scale fisheries. |
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