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Registros recuperados: 10
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Blockage of migration routes by dam construction: can migratory fish find alternative routes? Neotropical Ichthyology
Antonio,Rosimeire Ribeiro; Agostinho,Angelo Antonio; Pelicice,Fernando Mayer; Bailly,Dayani; Okada,Edson Kioshi; Dias,João Henrique Pinheiro.
The present study explored the interaction between the upriver migration of fish and the blockage of their migration routes by dam construction. Specifically, we studied (i) the capacity of migratory fish to locate alternative routes in the presence of an obstacle, and (ii) the behavior of the fish after they were artificially transferred to the reservoir. With the use of the mark-recapture technique (tagging), the study was carried out near Porto Primavera Dam (UHE Engenheiro Sérgio Motta) between 1994 and 1999, a period prior to the closure of the floodgates and the installation and operation of the fish pass facilities. The fish were caught in the dam forebay downstream, marked with LEA type tags, and released upstream (5113 individuals; 14 species) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish migration; Fish pass; Tagging; Paraná River; Porto Primavera Reservoir.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200012
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Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil Neotropical Ichthyology
Pelicice,Fernando Mayer; Agostinho,Carlos Sérgio.
Downstream passage through fish ladders and other facilities remains largely uninvestigated in South America. In view of this concern, we monitored ascending and descending fish movements through the fish ladder at Peixe Angical Dam, upper Tocantins River, Brazil, between September 2009 and August 2010. To investigate the extent of downstream passage, the fish fauna was sampled monthly (i) at sites upstream and downstream from the dam and (ii) inside the ladder. To distinguish between ascending and descending movements, the fish ladder remained open (permanent water flow), but a screen blocked the complete passage of fish in both directions. The results of the study indicated that the ladder restricts fish movements in both directions. Few species were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon basin; Conservation; Management; Migratory fish; One-way movements.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400003
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Diel variation in the ascent of fishes up an experimental fish ladder at Itaipu Reservoir: fish size, reproductive stage and taxonomic group influences Neotropical Ichthyology
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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Feeding and reproductive ecology of Cichla piquiti Kullander & Ferreira, 2006 within its native range, Lajeado reservoir, rio Tocantins basin Neotropical Ichthyology
Marto,Vanilcia Clementino de Oliveira; Akama,Alberto; Pelicice,Fernando Mayer.
Cichla piquiti is endemic to the Tocantins-Araguaia river basin, but information about its biology is restricted to populations introduced in other basins. In order to fill this gap, we investigated the feeding ecology and reproductive dynamics of C. piquiti in Lajeado reservoir, rio Tocantins. A total of 270 fish were collected between November 2010 and October 2011. The diet is rich and composed of at least 23 resources, predominantly fish (at least 19 species). We observed no clear influence of sex, periods and ontogeny on diet, which was basically composed of Characidae and Cichlidae. Considering its reproductive dynamics, immature, reproductive and non-reproductive fish were recorded during the whole study, and reproductive effort did not differ among...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Management; Population; Predator; Recruitment.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000300625
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Fish diversity in the cascade of reservoirs along the Paranapanema River, southeast Brazil Neotropical Ichthyology
Pelicice,Fernando Mayer; Azevedo-Santos,Valter M.; Esguícero,André Luiz Henríques; Agostinho,Angelo Antonio; Arcifa,Marlene Sofia.
ABSTRACT The Paranapanema River is a major tributary of the upper Paraná river basin. Eleven hydropower dams regulate its main course, but no study has investigated fish diversity in these impoundments at the basin-scale. The present study investigated spatial patterns of richness, composition, and abundance of native (non-migratory and migratory) and non-native fishes in the cascade of reservoirs along the Paranapanema River. The study is based on data collected from 34 independent studies conducted in nine reservoirs (47 samples). The compilation recorded 161 species, being 111 native (14 migratory) and 50 non-native. Total richness ranged between 56 and 112 species/reservoir, with a mean of 72 (49.9 non-migratory, 8.1 migratory and 14 non-native). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dam; Fish fauna; Longitudinal; Migratory fish; Non-native.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000200213
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Fish ladders: safe fish passage or hotspot for predation? Neotropical Ichthyology
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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Growing, losing or introducing? Cage aquaculture as a vector for the introduction of non-native fish in Furnas Reservoir, Minas Gerais, Brazil Neotropical Ichthyology
Azevedo-Santos,Valter Monteiro de; Rigolin-Sá,Odila; Pelicice,Fernando Mayer.
Cage aquaculture has been developed in many countries, including Brazil. This form of production, although economically productive, may cause several impacts to the environment. Considering the historical relationship between aquaculture and species introduction, our study investigated the potential of cage aquaculture in spreading non-native species into hydroelectric reservoirs. We interviewed 19 fish farmers in Furnas Reservoir, Grande River basin. All producers have grown exclusively Nile tilapia (Oreochromis niloticus), an African fish, and all producers reported the occurrence of fish escapes. Releases were mainly accidental, but highly frequent during some management procedures, such as length classification, fish capture and juvenile stocking....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Escapes; Introduced fish; Management; Neotropic; Oreochromis niloticus; Tilapia.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400024
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Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River Neotropical Ichthyology
Massaro,Marthoni Vinicius; Pachla,Lucas Adriano; Bastian,Rodrigo; Pelicice,Fernando Mayer; Reynalte-Tataje,David Augusto.
ABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diversity; Floodplain; Migratory fish; Riparian vegetation; River channel.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500210
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Short-term changes in energy allocation by Hemiodontidae fish after the construction of a large reservoir (Lajeado Dam, Tocantins River) Neotropical Ichthyology
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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Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes Neotropical Ichthyology
Pelicice,Fernando Mayer; Thomaz,Sidinei Magela; Agostinho,Angelo Antonio.
Submerged macrophytes play an important role in structuring habitats and, therefore, in determining patterns of aquatic biodiversity. Because these plants are widespread in shallow areas of many Neotropical reservoirs, the present work investigated if variables related to habitat structure, measured in patches of submerged macrophytes (Egeria densa and E. najas), can be used to predict fish assemblage attributes (fish density and species richness). Based on patch characteristics at fine spatial extents (macrophyte patches within reservoir arms), we considered plant biomass, volume and proportional volume (i.e. percentage of macrophyte volume in the water column) as potential predictors. Fish and macrophytes were sampled with a 1-m² throw trap in littoral...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic plants; Habitat structure; Predictive ecology; Variability; Tropical reservoir.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400001
Registros recuperados: 10
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