Catch variation and demographic structure of common dentex (Sparidae) exploited by Mediterranean artisanal fisheries

The common dentex, Dentex dentex (Linnaeus, 1758), is an iconic coastal fish found in the Mediterranean Sea. Despite its ecological and economic importance, scientific data on its exploitation are scarce, especially off Corisca. The aims of our study were to: (1) analyze the relationship between the catch per unit effort (CPUE, by weight and number) and possible factors driving the trends observed; (2) examine temporal and spatial trends in CPUE; (3) examine the spatial distribution of fishing effort; and (4) compare the size distribution and age structure of catches. Sampling was conducted on fishing vessels operating from the main fishing harbors and in the main fishing sectors off Corsica between 2009 and 2013. CPUE varied spatiotemporally, but overall displayed annual stability. CPUE varied significantly as a function of month, strata, and depth. A seasonal pattern was observed with high catches during the spawning period (May) when size classes were mainly composed of mature individuals. Length and age frequency histograms after the spawning period (June September) indicated that exploitation focused on small/young, immature individuals. Our spatial approach revealed a heterogeneous catch distribution and identified important exploitation areas. Results suggest that a combination of management tools and specific measures to safeguard the reproductive potential of this species should be implemented.