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| Makrakis,Sérgio; Makrakis,Maristela Cavicchioli; Wagner,Ricardo Luiz; Dias,João Henrique Pinheiro; Gomes,Luiz Carlos. |
| Utilization of the fish ladder installed at the Engenheiro Sergio Motta Dam (also known as Porto Primavera) on the Paraná River, Southern Brazil, by long-distance migrating potamodromous species (sampling Protocol I), and ascending and descending movements (Protocol II) were evaluated. Three pools along the fish ladder (designated as lower, middle, and upper) were sampled monthly between December, 2004 and March, 2005 to determine the abundance of species in the ladder. The ascending and descending movements of the species in the ladder were also analyzed in the same period. In the samples for both protocols, 37 species representing 17 families and 5 orders (Characiformes, Siluriformes, Perciformes, Gymnotiformes, and Myliobatiformes) were recorded.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Paraná River; Migratory fish; Transposition; Fish passage. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200014 |
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| Fernandez,Domingo Rodriguez; Agostinho,Angelo Antonio; Bini,Luis Mauricio; Pelicice,Fernando Mayer. |
| In this study, we evaluated the fish ascent in the experimental ladder at Itaipu Reservoir (Paraná State, Brazil), in relation to diel variation, fish size, reproductive stages and species composition. The study was carried out from October, 1995 to February, 1996 and from November, 1996 to January, 1997 at two points on the ladder (boxes at heights of 10 and 27 m). Twenty-two species were recorded, and Prochilodus lineatus, Pimelodus maculatus, Leporinus obtusidens, Schizodon borellii and Leporinus friderici accounted for 86.6 % of the total catch. Fish length did not differ between diel periods and boxes. On the other hand, fish abundance of the main species was significantly influenced by box position, reproductive stage and diel period. The higher box... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish migration; Fish passage; Selectivity; Non-reproductive fish; Management. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200016 |
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| Agostinho,Angelo Antônio; Marques,Elineide Eugênio; Agostinho,Carlos Sérgio; Almeida,Deusimar Augusto de; Oliveira,Rafael José de; Melo,Jussiclene Rodrigues Bezerra de. |
| Fish ladders are generally conceived to reestablish connectivity among critical habitats for migratory species, thus mitigating the impacts of the blockage of migration routes by dams. If this management tool is to be meaningful for conserving fish species, it must provide a fully permeable connection and assure both upward and downward movements. However, because reservoirs have very different hydrodynamics than the original river, it is expected that, at least in the inner area, they may constitute an additional barrier to this movement, especially for descending fish. Thus, the present study sought to determine if migratory fish and their offspring disperse downstream from the dam after ascending a ladder and spawning in the upper reaches of a basin. To... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish passage; Reservoir; Downstream migration; Larvae drift; Rio Tocantins. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200005 |
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| Castro,Miriam A. de; Santos,Hersília de A.; Sampaio,Francisco A. C.; Pompeu,Paulo S.. |
| Very little research has been conducted on the swimming capacity of Neotropical fish. The few studies available have focused on large migratory species. The present study used fixed and increasing velocity tests to determine prolonged and sustained speeds of the "pequira", Bryconamericus stramineus Eigenmann, 1908, a small, abundant species found in fish passages implemented at the Paraná basin, Brazil. The results of increasing velocity tests showed significant relationships between critical speeds, total and standard lengths, and body weight. When compared with other Neotropical fish, the "pequira" is able to swim faster than individuals of other species of similar length. The point of change from sustained to prolonged swimming was found to occur at an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Critical speed; Fish passage; Prolonged swimming; Tetragonopterinae. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600015 |
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