The fish fauna in the fish passage at the Ourinhos Dam, Paranapanema River
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
21/10/2013
21/10/2013
2012
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Resumo |
The composition and abundance of the fish assemblage were evaluated in the fish ladder of Ourinhos Dam, the newest dam (closed in 2005) in the cascade of dams constructed on the Paranapanema River. Samplings were carried out three times on a diel cycle, in three sampling periods, two in the warm season and one in the cold season of 2008 - 2009. The ladder was closed and emptied and the entire fish assemblage was sampled and identified. Most individuals were released alive downstream of the dam. The assemblage found in the ladder was compared with the fish fauna sampled in the reservoir and in downstream sites, in the same period. Twenty seven species and a total of 4682 individuals were caught in the ladder. Pimelodus maculatus was the only migratory species, which was caught in low number in the ladder (0.04% of the total captured), where small sedentary species predominated. The most abundant species were the non-migratory Apareiodon affinis, Bryconamericus stramineus, Astyanax fasciatus and Parodon nasus. Individuals observed in the ladder's window were moving up-and down the passage. The fish ladder is a microhabitat inhabited by an abundant association of benthic organisms that is probably used as a food resource for the fish assemblage in the ladder. The similarity between the fish fauna in the ladder and that of the Ourinhos Reservoir was low (26%). The species richness of migrants in the stretch between the uspstream reservoir (Chavantes) and the downstream one (Salto Grande), before the Ourinhos dam closure (23 species) was reduced to 16 and 12 species in Salto Grande and Ourinhos reservoirs, respectively, after the dam closure, and to a single species in the ladder. |
Identificador |
NEOTROPICAL ICHTHYOLOGY, SAO PAULO, v. 10, n. 4, supl., Part 3, pp. 715-722, OCT 30, 2012 1679-6225 http://www.producao.usp.br/handle/BDPI/35243 10.1590/S1679-62252012000400004 |
Idioma(s) |
eng |
Publicador |
SOC BRASILEIRA ICTIOLOGIA SAO PAULO |
Relação |
NEOTROPICAL ICHTHYOLOGY |
Direitos |
openAccess Copyright SOC BRASILEIRA ICTIOLOGIA |
Palavras-Chave | #FISH ABUNDANCE #FISH FAUNA COMPOSITION #FISH LADDER #SOUTH AMERICA #BRAZILIAN RESERVOIR #LADDER #ROUTES #ZOOLOGY |
Tipo |
article original article publishedVersion |