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Consultar: Artigo

Título: Identification of spawning sites and natural nurseries of fishes in the upper Paraná River, Brazil
Autor(es): BAUMGARTNER, G.; NAKATANI, K.; GOMES, L.C.; BIALETZKI, A.; SANCHES, P.V.; MAKRAKIS, M.C.
Palavras-chave [PT]:

Ovos. Larvas. Estratégia. Direção. Paraná, Rio. Brasil.

Eggs. Larvae. Strategy. Drift. Paraná River. Brazil.

Abstract: We studied the timing of migratory fish spawning in the last dam-free stretch of the upper Paraná River and in Itaipu Reservoir. Eggs were more common in the Amambai and Ivaí Rivers, while larvae predominated in the Paraná River and in Itaipu Reservoir. Both eggs and larvae were more abundant at night. The highest abundance of eggs was in October and that of larvae in November. Migratory species predominated in the Amambai and Paraná Rivers, and non-migratory species in the Ivaí River and Itaipu Reservoir. The predominance of eggs in the upper and middle portions, and larvae in the lower, infer that there are spawning sites in the former and nurseries in the latter. The high nocturnal abundance of eggs is associated with spawning at sunset and that of larvae with feeding, avoidance of predators and nocturnal disorientation. The presence of tributaries such as the Amambai and Ivaí Rivers in the last dam-free stretch of the Paraná River is extremely important to the maintenance of regional fish diversity and fish stocks in both the Paraná River and Itaipu Reservoir.

BAUMGARTNER, Gilmar; NAKATANI, Keshiyu; GOMES, Luiz Carlos; BIALETZKI, Andréa; SANCHES, Paulo Vanderlei; MAKRAKIS, Maristela Cavicchioli. Identification of spawning sites and natural nurseries of fishes in the upper Paraná River, Brazil. Environmental Biology of Fishes, Dordrecht, v.71, no.2, p.115-125, 2004.

Received 1 August 2002 Accepted 18 December 2003

Responsavel: salete
Categoria: Aplicação
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Arquivo: 50-Identification of spawning.pdf
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Criado: 28-05-2008 10:13
Atualizado: 26-06-2008 15:00
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