Survival of radio-tagged Atlantic salmon (Salmo salar L.) and trout (Salmo trutta L.) smolts passing a reservoir during seaward migration

Jepsen, Niels; Aarestrup, Kim; Økland, Finn; Rasmussen, Gorm

doi:10.1007/978-94-011-5090-3_39

Cited by 127 publications

(205 citation statements)

References 18 publications

Supporting

Mentioning

187

Contrasting

Unclassified

Order By: Relevance

“…In conclusion, problems related to downstream passage have been recognized worldwide (Jepsen et al, 1998;Larinier & Travade, 2002;O'Connor et al, 2006;Carr & Whoriskey, 2008;Kraabøl et al, 2009), but these problems are a new concern in South America. The basic characteristics of downstream passage (e.g., do fish pass downstream?)…”

Section: Discussionmentioning

confidence: 98%

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Pelicice

Agostinho

2012

Neotrop. ichthyol.

View full text Add to dashboard Cite

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 found to use the ladder (31 out of 119 species recorded in the area). Moreover, monitoring revealed that downstream passage is even more limited. Only 18 species were recorded moving downstream. In addition, few fish attempted to move downstream during the year; of all fish captured in the ladder (n = 17,335), only 4% were descending. Species performing exclusive downstream movements were numerically rare or infrequent. Most downstream captures involved only four species. We emphasize that several species performed one-way upstream movements or showed a high density of ascending fish. Consequently, the numerical ratio between ascending and descending fish (ind./m 2 ) showed high positive values throughout the year (644:1 on average, considering all species); migratory species showed higher ratios (1069:1). The results of the study show that the facility fails to support the downstream passage of migratory and non-migratory fishes. We conclude that the fish ladder at Peixe Angical Dam does not play a conservation role and may complicate alternative conservation efforts.A passagem descendente de peixes em mecanismos de transposição permanece pouco investigada na América do Sul. Inspirado nessa falha, o presente estudo monitorou a escada de peixes instalada na barragem da UHE Peixe Angical, alto rio Tocantins, entre setembro de 2009 e agosto de 2010. Para investigar a extensão da passagem rio abaixo, a fauna de peixes foi amostrada mensalmente em (i) locais acima e abaixo da barragem, e (ii) dentro da escada. Para identificar corretamente movimentos ascendentes e descendentes dentro da escada, o mecanismo permaneceu aberto (fluxo permanente de água), mas uma tela impediu a passagem completa dos peixes em ambas as direções. Os resultados indicam que a escada é restritiva ao movimento dos peixes em ambos os sentidos, considerando que poucas espécies tiveram acesso ao mecanismo (de um total de 119 espécies na área, apenas 31 ocorreram na escada). O monitoramento revelou, entretanto, que a passagem descendente é consideravelmente mais limitada; apenas 18 espécies foram registradas descendo o mecanismo. Além disso, poucos peixes tentaram descer a escada ao longo do ano; de todos os peixes capturados na escada (n = 17,335), apenas 4% desempenhava movimentos descendentes. ...

show abstract

Section: Discussionmentioning

confidence: 98%

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Pelicice

Agostinho

2012

Neotrop. ichthyol.

View full text Add to dashboard Cite

show abstract

“…Acoustic and radio telemetry are used throughout the world to examine fish behavior and survival [1,2]. Field studies typically assume that the presence of a transmitter and the process of implanting the transmitter do not affect the survival, behavior, or performance of fish (that is, tagged individuals are representative of the population of interest [3]).…”

Section: Introductionmentioning

confidence: 99%

Survival of seaward-migrating PIT and acoustic-tagged juvenile Chinook salmon in the Snake and Columbia Rivers: an evaluation of length-specific tagging effects

Brown

Oldenburg

Seaburg

et al. 2013

Animal Biotelemetry

View full text Add to dashboard Cite

Background: Acoustic telemetry is a widely used tool for evaluating the behavior and survival of juvenile salmonids in the Columbia River basin. Thus, it is important to understand how the surgical tagging process and the presence of a transmitter affect survival. This study evaluated the effect of fish length on the survival of yearling and subyearling Chinook salmon during their seaward migrations through the Snake and Columbia Rivers during 2006, 2007, and 2008. Fish were collected at Lower Granite Dam on the Snake River (695 river km from the mouth of the Columbia) and implanted with either only a passive integrated transponder (PIT) tag (PIT fish) or both a PIT tag and an acoustic transmitter (AT fish). Results: Across the 3 years, a total of 157,000 yearling and subyearling fish were tagged and designated as PIT fish and 18,500 as AT fish. Survival was estimated from release at Lower Granite Dam to multiple downstream dams using the Cormack-Jolly-Seber single release model, and analysis of variance was used to test for differences among length classes for both tag types. No length-specific tag effect was detected between PIT and AT fish (that is, length affected the survival of PIT fish and AT fish in a similar manner). Fish length was positively correlated with the survival of both PIT and AT fish. Survival was markedly low among the smallest length class (that is, 80 mm to 89 mm) of both PIT and AT subyearling Chinook salmon and the survival of PIT fish was generally greater than that of AT fish.

show abstract

“…Moreover, vivid colours of the tags (majority of them were red) may have made spotting the fish easier for the herons. Grey Herons have been reported to forage on easily caught prey such as tagged smolts, or caged fish that were blind or in poor body condition (Carss 1993, Jepsen et al 1998, Koed et al 2002.…”

Section: Discussionmentioning

confidence: 99%

The response of Grey HeronsArdea cinereato changes in prey abundance

Jakubas

Manikowska

2011

Bird Study

View full text Add to dashboard Cite

Survival of radio-tagged Atlantic salmon (Salmo salar L.) and trout (Salmo trutta L.) smolts passing a reservoir during seaward migration

Cited by 127 publications

References 18 publications

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Deficient downstream passage through fish ladders: the case of Peixe Angical Dam, Tocantins River, Brazil

Survival of seaward-migrating PIT and acoustic-tagged juvenile Chinook salmon in the Snake and Columbia Rivers: an evaluation of length-specific tagging effects

The response of Grey HeronsArdea cinereato changes in prey abundance

Contact Info

Product

Resources

About