Single-Species Co-management Improves Fish Assemblage Structure and Composition in a Tropical River

Co-management is increasingly recognized as an effective model for managing fisheries, but little information exists on whether co-management can produce effects in species other than the target species. Fishery tropics, where fish diversity high and catches tend to be multispecies, prone assemblage-wide via alterations food web changes overall capture of non-target Here, we assessed Arapaima sp. relation structure composition assemblage floodplain lakes central Amazon Basin. These are managed under a system zoning fishing activities. We used data from surveys six lakes, including two each three categories (lakes prohibited, limited-access open lakes). The were carried out before after implementation co-management, through gillnet fishing. study area was lower Solimões River, Basin, Brazil. Statistical models showed significant assemblages regardless category. Through regulation gear use practices, allowed colonization that had not been present before, which lead higher richness consequently increased sizes, abundance biomass. Species sedentary habits, migrants short medium distances, with commercial importance benefited most co-management. In results presented temporal scale, it possible observe potential spillover effect being provided by prohibited (no-take zones) those limited access Thus, positive all