Produção Nacional
Variações espaciais na assembléia de peixes no Rio Paraíba do Sul (Barra Mansa, Barra do Piraí), Rio de Janeiro, Brasil
2001; Sociedade Brasileira de Zoologia; Volume: 18; Issue: 2 Linguagem: Inglês
10.1590/s0101-81752001000200019
ISSN1806-969X
AutoresFrancisco Gerson Araújo, Ilana Fichberg, Benjamin Carvalho Teixeira Pinto, Magna Galvão Peixoto,
Tópico(s)Fish Ecology and Management Studies
ResumoSpatial Variation in Fish Assemblage in the Paraíba do Sul River (Barra Mansa, Barra do Piraí), Rio de Janeiro, Brazil.The Paraíba do Sul is a major running water system in southeastern Brazi I (22°24 ' -22°26 ' S; 43°43' _44° 16' W), draining one of the most important industrial regions in the country.Because of its location, it has suftered a large amount 01' alteration due to discharges of urban and industrial eftluents with direct innuence in the ichthyotàuna.The aim ofthis study is to up-to-date information on fish assemblage structure and its variation in the vic inity 01' a major industrial effluent outfall at Volta Redonda industrial complex.A standardized fishing sampling program, using seines, casting nets, gill nets and net trays, was carried out from October 1997 to September 1999, at six sites in three zones of the river (upstream, nearby and downstream lhe industrial complex), aiming to compare variation in fish assemblage due to anthropogenic alteration.Fifty-two species in 13 families were identified in the total of 7286 fish specimens.Characidae was the most divel'se family contributing with 28,85% to total number of species, followed by Cichlidae (17,31 %).Overall 15,38% ofthe species were introduced from other watershed systems, four exotic cichl ids (genera Oreochromis Günther, 1862 and Tilapia A. Smith, 1840) and three aloctone (CieMa oeellaris Bloch & Schneider, 1801 , Hyphessobrieol1 eallis/us (Boulenger, 1900) e Me/yl1l1is maeula/us (Kner, 1860)).Lebistes retielllatlls (Peters, 1859) was the most abundant tish species contributing to 39,7% of the total number of fish, followed by Geophagus brasiliellsis (Quoy & Gaim ard, 1824) amounting to 27,4%.Fish abundance was higher in the industrial zone, but only a few very dominant species were captured, while the upstream zone showed the most even community.Species replacement tolerance along the altel'ations gradient in the three zone seems to be a strategy to use the limited resources in the area.
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