Variações temporais na passagem de peixes pelo elevador da Usina Hidrelétrica de Santa Clara, rio Mucuri, leste brasileiro

Pompeu, None Paulo dos Santos; Martinez, Carlos Barreira

doi:10.1590/s0101-81752006000200005

Cited by 21 publications

(21 citation statements)

References 4 publications

(4 reference statements)

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“…Thereby, as a measure to reduce the impact on the community, we recommend conciliate activities more risky to the fish with periods of lowest abundance in the tailrace (i.e., in the months of low precipitation). Siluriformes are a nocturnal group (Burgess, 1989), whereas Characiformes present a more diverse pattern of activities with a diurnal peak (Pompeu & Martinez, 2006). These patterns were confirmed by the present study.…”

Section: Discussionsupporting

confidence: 88%

Temporal variation in fish community in the tailrace at Três Marias Hydroelectric Dam, São Francisco River, Brazil

Loures¹

2012

Neotrop. ichthyol.

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Damming rivers to generate hydroelectric energy causes a series of changes in the environment, including impacts on the ichthyofauna. Knowledge of the fish community immediately downstream from a hydroelectric dam can help to reduce the negative effects of dam operation, such as fish entrance into the draft tube during turbines maintenance. We evaluated the temporal variation in fish community composition and abundance, near Três Marias Hydroelectric Dam (TMD), and its relationship with abiotic variables. Samples (n = 18) were carried out using gill nets in the tailrace of the dam, over the course of a hydrological year, at six time points during a 24-hour period. Abiotic data were also sampled to assess the relationship with the biotic data. In the tailrace, Characiformes showed the highest richness, while Siluriformes were the most abundant. Of the 33 species sampled, six were migratory. The fish community was significantly different between the dry and wet seasons, with higher abundances during the wet season. In the wet season, the frequency of migratory species in the community rose from 0.7 to 18.3%, and Pimelodus maculatus accounted for 14.5% of the overall abundance. We observed that Characiformes captures occurred mainly in the morning, with peak activity between 5:00 and 9:00 h. Siluriformes showed greater nocturnal activity and were largely captured between 17:00 and 21:00 h. Synchronizing operational maneuvers that represent high risk to the fish with periods of low abundance in the tailrace, i.e., during months of low precipitation, may be a measure to reduce the impact of the operation on the downstream fish community.O barramento de rios para implantação de hidrelétricas causa uma série de modificações no ambiente, gerando impactos sobre a ictiofauna. O conhecimento sobre a comunidade de peixes encontrada imediatamente à jusante pode auxiliar na redução de impactos gerados pela sua operação. Assim, avaliamos as variações temporais na comunidade de peixes próxima à Usina Hidrelétrica de Três Marias quanto à composição de espécies, abundância e suas relações com variáveis abióticas. Foram realizadas 18 coletas com redes de emalhar no canal de fuga da usina, durante um ano hidrológico, em seis horários ao longo de 24 h, quando também foram obtidos dados abióticos. Foi observado que no canal de fuga da usina, Characiformes apresentou uma maior riqueza, enquanto os Siluriformes foram os mais abundantes. Das 33 espécies coletadas seis eram migradoras. A comunidade de peixes foi significativamente diferente entre os meses de seca e chuva, com maior abundância no período de chuva. Neste período, a frequência das espécies migradoras na comunidade subiu de 0,7 para 18,3%, sendo que Pimelodus maculatus representou 14,5% da abundância. A maior captura de Characiformes se deu no período da manhã com pico de atividade de 5:00 às 9:00 h. Os Siluriformes apresentaram maior atividade à noite, principalmente das 17:00 às 21:00 h. Conciliar manobras que oferecem mais riscos para os peixes com o período de menor abun...

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Section: Discussionsupporting

confidence: 88%

Temporal variation in fish community in the tailrace at Três Marias Hydroelectric Dam, São Francisco River, Brazil

Loures¹

2012

Neotrop. ichthyol.

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“…and the curimatã (Prochilodus spp.) (Fernandez et al, 2004;Vono et al, 2004;Bizzoto, 2006;Pompeu, 2006). However, it is possible that the swimming capacity of this genus is greater than that of other migratory Characiformes.…”

Section: Discussionmentioning

confidence: 99%

Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Santos

Martinez

2007

Neotrop. ichthyol.

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The fishways built in Latin America were mainly based on those used in the northern hemisphere for passing salmonids upstream. However, the swimming capacity in terms of speed and endurance is a major factor concerning the design of a fishway, and this information is not available for migratory neotropical fish species. Therefore, studies on swimming performance of neotropical species is fundamental. The aim of this study was to estimate the critical, sustained and prolonged speeds for the piau-três-pintas Leporinus reinhardti, and to evaluate the influence of water temperature on the swimming performance of the species. Variable (increasing) and fixed velocity tests were performed in a respirometer. When compared to other species whose critical speed data are available, the piau showed higher speeds, for a given total length. Fatigue times per prolonged speed class were estimated as well as prolonged speed per fatigue time class. The changing point from sustained to prolonged swimming was estimated to occur approximately at a speed of seven body-lengths per second (1.12 m/s for an individual with 16 cm total length: the first maturation length). In spite of the great swimming performance of piau, the adoption of efficient directives in fishway projects to allow the passage of neotropical ichthyofauna, will depend on a more detailed analysis of the swimming capacity of different species.As passagens para peixes construídas na América Latina são principalmente baseadas nos dispositivos existentes no hemisfério norte que, por sua vez, foram dimensionados para salmonídeos. Entretanto, a capacidade natatória das espécies migradoras, em termos de resistência e velocidade, é o principal fator a ser considerado no dimensionamento de uma passagem para peixes e estas informações ainda não são conhecidas para as espécies migradoras neotropicais. Dessa forma, o estudo da capacidade natatória das espécies neotropicais tornou-se uma necessidade. Este estudo tem como objetivo estimar as velocidades crítica, sustentável e prolongada do piau-três-pintas, Leporinus reinhardti, bem como avaliar a influência da temperatura da água na capacidade natatória. Testes de velocidade variável e fixa foram desenvolvidos em um aparato experimental do tipo respirômetro. Quando comparado a outras espécies, cujos dados de velocidade crítica são disponíveis, observa-se que o piau apresenta velocidades superiores para um mesmo comprimento total. Tempo de fadiga por classe de velocidade prolongada foram obtidos bem como a velocidade prolongada por classes de tempo de fadiga. O ponto de mudança do modo sustentável para o modo prolongado de natação foi estimado ocorrer em, aproximadamente, sete comprimentos por segundo (1.12 m/s para indivíduos com 16 cm de comprimento total: comprimento de primeira maturação). Apesar da grande capacidade natatória do piau, a adoção de critérios eficientes para o projeto de mecanismos de transposição para peixes neotropicais dependerá de análise detalhada da capacidade natatória de diferentes espécies.

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“…Our results indicated that it is possible that migratory species complete their life cycle in the Mucuri River, even though spawning sites are located upstream, and nursery areas downstream, of the Santa Clara Dam. Taking into account the selectivity and efficiency of the fish lift in attracting the shoals (POMPEU & MARTINEZ 2006, it is likely that this mechanism greatly facilitates the conservation of a number of fish species in the Mucuri River. However, only a long term monitoring program of the fish fauna will be able to reveal its efficiency in maintaining viable populations of the region's migratory species.…”

Section: Discussionmentioning

confidence: 99%

Downstream passage of fish larvae and eggs through a small-sized reservoir, Mucuri river, Brazil

Pompeu¹,

Nogueira²,

Godinho³

et al. 2011

Zoologia (Curitiba)

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In South America, one important symptom of the failure of fish passages to sustain fish migratory recruitment is the inability of eggs and larvae to reach the nurseries. This is especially so when the breeding areas are located upstream of a reservoir, and the floodplain is downstream of the dam. Therefore, the transport of fish larvae and eggs across reservoir barriers is a key factor in the development of effective conservation strategies. In this paper, we evaluate the potential for migratory fish larvae and egg transportation across a small size reservoir in eastern Brazil. We sampled fish daily between 15th October 2002 and 15th February 2003 (spawning period) in the Mucuri River, immediately upstream of the reservoir and downstream of the Santa Clara Power Plant dam. Our study was the first to indicate the possibility of successful larval passage through the reservoir of a hydroelectric reservoir and dam in South America, and showed that the passage of migratory fish larvae was associated significantly with residence time of water in the reservoir. The relatively short water residence time and elevated turbidity of the Santa Clara's reservoir waters during the rainy season certainly contributed to the successful passage, and can be considered as key factors for a priori evaluations of the feasibility of a downstream larval passage

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Variações temporais na passagem de peixes pelo elevador da Usina Hidrelétrica de Santa Clara, rio Mucuri, leste brasileiro

Abstract: Tabela V. Relações estatísticas entre a abundância (CPUE) de diversos grupos de espécies transpostas e as vazões e precipitação no rio Mucuri. Variáveis transformadas para a escala logarítima; modelos significativos encontram-se em negrito. EspéciesVazão

Cited by 21 publications

References 4 publications

Temporal variation in fish community in the tailrace at Três Marias Hydroelectric Dam, São Francisco River, Brazil

Temporal variation in fish community in the tailrace at Três Marias Hydroelectric Dam, São Francisco River, Brazil

Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Downstream passage of fish larvae and eggs through a small-sized reservoir, Mucuri river, Brazil

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