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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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| Agostinho,Angelo Antonio; Agostinho,Carlos Sergio; Pelicice,Fernando Mayer; Marques,Elineide Eugênio. |
| Fish ladders are a strategy for conserving biodiversity, as they can provide connectivity between fragmented habitats and reduce predation on shoals that accumulate immediately below dams. Although the impact of predation downstream of reservoirs has been investigated, especially in juvenile salmonids during their downstream movements, nothing is known about predation on Neotropical fish in the attraction and containment areas commonly found in translocation facilities. This study analysed predation in a fish passage system at the Lajeado Dam on the Tocantins River in Brazil. The abundance, distribution, and the permanence (time spent) of large predatory fish along the ladder, the injuries imposed by piranhas during passage and the presence of other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish migration; Fish pass; Piscivores; Serrasalmus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400001 |
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| Agostinho,Carlos Sérgio; Agostinho,Angelo Antônio; Pelicice,Fernando; Almeida,Deusimar Augusto de; Marques,Elineide Eugênio. |
| Although dozens of fish ladders have been constructed at dams of Brazilian reservoirs, there are few studies evaluating their efficiency as a tool for the conservation of Neotropical ichthyofauna, especially for migratory species. Therefore, the present study evaluated the selectivity of the species that entered and ascended the fish ladder located next to Lajeado Dam (Luis Eduardo Magalhães Hydroelectric Power Plant) on the Tocantins River. Samples were taken monthly from November, 2002 through October, 2003, in the resting pools of the ladder, using cast nets, and in the downstream stretch, using gillnets. The selectivity of the ladder in attracting fish was evaluated by comparing the occurrence, relative abundance, dominance and the congruence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Migratory fish; Fish conservation; Biodiversity; Reservoir; Lajeado Dam; Tocantins River. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200015 |
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| Medeiros,Estevão Rodrigues; Pelicice,Fernando Mayer; Agostinho,Carlos Sergio; Marques,Elineide Eugênio. |
| The present study investigated energy allocation patterns in three fish species from the family Hemiodontidae (Argonectes robertsi, Hemiodus microlepis, and Hemiodus unimaculatus), before and after the construction of Lajeado Dam, Tocantins River, Amazon basin. Changes in the use of energy (between somatic and reproductive processes) were indirectly evaluated by means of temporal variations in fish body condition, feeding activity, visceral fat storage, and reproductive effort. Fish were collected from October 1999 to September 2004, in periods that preceded and followed the construction of the dam. We recorded significant changes in all ecological traits for the three analyzed species (for males and females). In general, there was an intense reduction in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body condition; Colonization; Fitness; Reproduction; River regulation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000300649 |
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