%0 Journal Article
%T Abstract
%A Claudio Baig迆n
%A Priscilla Minotti
%A Norberto Oldani
%J Neotropical Ichthyology
%D 2013
%I Sociedade Brasileira de Ictiologia
%X This study assesses the change in fish exploitation patterns of the s芍balo fisheries of the lower Paran芍 River basin based on hydrological, biological, and fishery indicators. From historical catch records, we recorded a shift from a lightly and moderate exploited status before 2001 to a heavily exploited one, as a result of the development of s芍balo exports from 2001 onwards. Channel and floodplain connectivity indices demonstrated that the Paran芍 exhibited highly favorable hydrological conditions between 1972 and 1999 but more adverse conditions from 1999 to 2009, as a consequence of flood pulses reduction coincident with a fishing mortality increment. A total catch of 15,000 tons, including local consumption, regional market, informal sales, and exportation volumes, was estimated as the maximum sustainable catch. That level was instead exceeded 3 fold in 2004, in parallel with a decrease in the mean fish length from 48 to 42 cm, along with a reduction in both the mesh size from 16 to 12 cm and megaspawner proportion, and an increase of fishing mortality. Although growth overfishing was not noted, an analysis of the spawning potential ratio trend indicated that recruitment overfishing took place during 2005, since the fishing mortality rate was 4 times greater than the natural mortality rate. These observations suggest that less favorable hydrological conditions after 1999 coupled with a coincident high fishing pressure could have impacted the s芍balo population biomass. Management of s芍balo fisheries requires to set aside a single economic vision of the resource use moving to an ecosystem-oriented approach that incorporate, among others components, the hydrological regime, species life history traits, fishing impacts on other species, and main stakeholders socioeconomic requirements as key elements for the preservation of fishery sustainability. Este estudio eval迆a el cambio en los patrones de explotaci車n de las pesquer赤as de s芍balo (Prochilodus lineatus) en la baja cuenca del r赤o Paran芍 basado en indicadores hidrol車gicos, biol車gicos y pesqueros. A partir de registros hist車ricos de capturas se not車 un desplazamiento de un estado de explotaci車n ligera o moderada previa a 2001 a otro de explotaci車n intensiva como resultado del desarrollo de una pesquer赤a para exportaci車n a partir de ese a o. Los 赤ndices de conectividad hidrol車gica demostraron que el Paran芍 exhibi車 condiciones muy favorables para el s芍balo entre 1972 y 1999, pero m芍s adversas entre 1999 y 2009 al reducirse el caudal, que coincidi車 con un aumento en la mortalidad por pesca. Se estim車 en 15
%K Artisanal fisheries
%K Flood pulse
%K Neotropical rivers
%K Overfishing
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100199