Upstream migration of adult Atlantic salmon, <i>Salmo salar</i> L., in the River Vefsna, northern Norway

Jensen, Arne J.; Heggberget, Tor G.; Johnsen, Bjørn Ove

doi:10.1111/j.1095-8649.1986.tb04961.x

Cited by 57 publications

(67 citation statements)

References 5 publications

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“…The travel speeds of rainbow trout in this study are comparable with those reported for brown trout (Salmo trutta) (Rustadbakken et al 2004) but very slow in comparison with those reported for Atlantic salmon (Salmo salar) (Jensen et al 1986). Rainbow trout are known to migrate considerable distances (Meka et al 2003), and so fatigue is unlikely to explain the slow travel speed.…”

Section: Speed Of Travelsupporting

confidence: 73%

Migratory behaviour of spawning rainbow trout (Oncorhynchus mykiss) in the Tongariro River, New Zealand, after habitat alteration

Venman¹,

Dedual²

2005

New Zealand Journal of Marine and Freshwater Research

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The movements of 92 adult rainbow trout (Oncorhynchus mykiss) from Lake Taupo into the Tongariro River, New Zealand, were monitored using radio-telemetry every 3 days during the main spawning period between May and November 2003. This study repeated one previously conducted in 1995. Differences in spawning site preference and resting locations between 1995 and 2003 probably reflect differences in the nature of the river as a result of major natural floods that occurred in 1998. Average migration times were slower than in 1995 and the correlation between flow and mean daily movement was less distinct owing to the dry and settled weather during July and August, although fish did respond to freshets when they occurred. Peak movement occurred between 1600 and 2000 h NZ Standard Time with no movement occurring between midnight and 0400. Fish adjusted their movement in response to changing photoperiod. Nineteen fish were observed above the mouths of natal tributary streams for several weeks in the main river stem before entering these tributaries.

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Section: Speed Of Travelsupporting

confidence: 73%

Migratory behaviour of spawning rainbow trout (Oncorhynchus mykiss) in the Tongariro River, New Zealand, after habitat alteration

Venman¹,

Dedual²

2005

New Zealand Journal of Marine and Freshwater Research

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“…The travel speed of migrating rainbow trout in this study was in the lower range of those reported for salmonids (Jensen et al 1986). Fast rates of upstream travel have been reported for salmonids through estuaries and the lower reaches of long rivers (Hawkins & Smith 1986;Heggberget et al 1988;Glova & Washbourne 1990) and during the first 10 days after entering the river (Heggberget et al 1996).…”

Section: Speed Of Travelcontrasting

confidence: 67%

Movement of rainbow trout (Oncorhynchus mykiss) during the spawning migration in the Tongariro River, New Zealand

Dedual¹,

Jowett

1999

New Zealand Journal of Marine and Freshwater Research

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The movements of 74 rainbow trout (Oncorhynchus mykiss) were monitored every 2-3 days using radio-telemetry during the spawning migration up the Tongariro River, New Zealand, between June and November 1995. Contrary to the views of anglers, movements of individual fish were highly variable and upstream movement could not be predicted from environmental conditions and fish related variables (length, sex, and reproductive status). There was no significant difference in individual movement between male and female fish. When individual movements were in an upstream direction, maiden trout moved faster, but less often, than fish that had spawned in previous years. The flow in the lower river explained 9% of the variance in individual downstream movements. Net upstream movement occurred throughout most of the study period with above mean activity when the river was in spate, especially early in the migration season when fish responded to flow changes as low as 7%. Above mean upstream daily movement occurred 8 times on rising and 9 times on falling barometric pressure. Large floods caused downstream displacements, but fish tended to move up stream again on the flow recession. The most noticeable downstream movement occurred following the eruption of Mount Ruapehu. M98016

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“…Trépa-nier et al (1996) showed only limited effects of temperature on salmon upstream migration. Still, Jensen et al (1986) observed that Atlantic salmon passages upstream of rapids in a Norwegian river were correlated to increasing water temperature.…”

Section: Discussionmentioning

confidence: 99%

Upstream passage problems for wild Atlantic salmon (Salmo salar L.) in a regulated river and its effect on the population

et al. 2008

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Due to hydropower development, the upstream migration of wild anadromous salmon and brown trout is impaired in many European rivers, causing negative effects on the long-term survival of natural salmonid populations. This study identified problems for Atlantic salmon during upstream migration in a regulated river in northern Sweden, Umeälven (mean flow: 430 m 3 s -1 ). Tagging from 1995 to 2005 involved radio tags (n = 503), PIT tags (n = 1574) and Carlin tags (n = 573) to study the spawning migration of salmon from the coast past the regulated section of the river to a fish ladder at the dam/spillway 32 km upriver. The results demonstrate that migration success from the coast to the fish ladder varied between 0% and 47% among years, indicating an average loss of 70% of potential spawners. Discharge from the turbines attracted the salmon away from the bypass route. Echo-sounding in the turbine outlet showed that salmon were normally found at 1-4 m depths. They responded with upstream and/or downstream movements depending on flow changes; increased spill in the bypass channel attracted salmon to the bypass. Once in the bypass channel, salmon could be delayed and had difficulties passing the first rapid at high spills. Additional hindrances to upstream migration were found at rapids and the area of the fish ladder, located further upstream in the regulated river section. The average migration duration was 44 days from the estuary to the top of the fish ladder, with large variation among individuals within years. Modelling the salmon population dynamics showed a potential population increase of 500% in 10 years if the overall migration success could be improved from the current 30% to levels near 75%. Consequently improved migration facilities at the regulated river section should be implemented to achieve a long-term sustainability of these threatened anadromous salmonids.

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Upstream migration of adult Atlantic salmon, Salmo salar L., in the River Vefsna, northern Norway

Cited by 57 publications

References 5 publications

Migratory behaviour of spawning rainbow trout (Oncorhynchus mykiss) in the Tongariro River, New Zealand, after habitat alteration

Migratory behaviour of spawning rainbow trout (Oncorhynchus mykiss) in the Tongariro River, New Zealand, after habitat alteration

Movement of rainbow trout (Oncorhynchus mykiss) during the spawning migration in the Tongariro River, New Zealand

Upstream passage problems for wild Atlantic salmon (Salmo salar L.) in a regulated river and its effect on the population

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