The migratory behaviour of wild sea trout (Salmo trutta L.) smolts in the estuary of the River Conwy, North Wales

Moore, Andrew D.; Ives, M. J.; Scott, Mark C.; Bamber, Shaw

doi:10.1016/s0044-8486(98)00340-8

Cited by 36 publications

(33 citation statements)

References 9 publications

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“…Jonsson 1985, Knutsen et al 2001, which may be the reason why we recorded what seemed to be a slower and less directed migration closer to shore for the sea trout than for the Atlantic salmon. Even less is known about the marine phase of sea trout than of Atlantic salmon, and we know no other publications of telemetry studies of the marine migration of sea trout, except estuarine studies by Moore & Potter (1994) and Moore et al (1998). The sea trout post-smolts were passively moving with the ebb tide in the upper sections of the estuaries, but were actively swimming in the lower sections (Moore & Potter 1994, Moore et al 1998), as they did in the fjord areas in the present study.…”

Section: Discussionsupporting

confidence: 38%

“…The current drift drogue was attached 30 cm below a floater at the surface and, hence, reflected the current at 0.3-1.3 m depth. Atlantic salmon post-smolts usually swim close to the surface, in the upper brackish layer , which was also assumed to be true for sea trout in an estuary (Moore et al 1998).…”

Section: Fish Tracking and Simultaneous Current Measurementsmentioning

confidence: 99%

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Migration speeds and orientation of Atlantic salmon and sea trout post-smolts in a Norwegian fjord system

Thorstad

kland

Finstad

et al. 2004

Environmental Biology of Fishes

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We recorded the observed and actual swimming speeds of Atlantic salmon and sea trout post-smolts in a Norwegian fjord system, and initiated studies on the orientation mechanisms of the post-smolts. We tracked Atlantic salmon and sea trout with acoustic transmitters for up to 14 h after release. The actual swimming speed and direction of a fish relative to the ground is the vector sum of the observed movements of the fish and the movements of the water. We determined actual swimming speeds and directions of the post-smolts, which reflect their real swimming capacities and orientation, by corrections for the speed and direction of the water current. The post-smolts were actively swimming. The observed direction of movement was dependent on the actual movement of the fish and not the water current. Water currents were not systematically used as an orientation cue either in Atlantic salmon or sea trout, as the actual movements were random compared to the direction of the water current. The actual movement of sea trout were in all compass directions, with no systematic pattern. The Atlantic salmon also moved in all compass directions, but with the lowest frequency of actual movement towards the fjord.

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Section: Discussionsupporting

confidence: 38%

Section: Fish Tracking and Simultaneous Current Measurementsmentioning

confidence: 99%

Migration speeds and orientation of Atlantic salmon and sea trout post-smolts in a Norwegian fjord system

Thorstad

kland

Finstad

et al. 2004

Environmental Biology of Fishes

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show abstract

“…However, this has recently been questioned by Ugedal et al (1998), who found that first-time migratory sea trout had well developed hypo-osmoregulatory capacity and sea water tolerance. Moore et al (1998) observed that sea trout smolts required no apparent period of acclimation when moving from fresh to salt water. This contrasts with J.…”

Section: Discussionmentioning

confidence: 99%

Food of anadromous brown trout at sea

Knutsen

Gjøsæter

et al. 2001

Journal of Fish Biology

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The food of migratory Salmo trutta in coastal marine waters along the Norwegian Skagerrak coast varied significantly with age, season and habitat of the fish. The main prey categories in terms of frequency of occurrence were fishes followed by crustaceans, surface insects and polychaetes. Seasonal variation in diet and within habitats was found, supporting the view that brown trout is an opportunistic feeder. An ontogenetic niche shift was observed with post-smolts feeding on inshore and shallow water prey communities, while larger brown trout fed mainly on pelagic fishes. 2001 The Fisheries Society of the British Isles

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“…Most previous marine tracking studies of sea trout have focused on postsmolt migration behaviour (e.g., Moore et al 1998;Thorstad et al 2004), whereas only a few studies have covered older life stages (Bendall et al 2005;Jensen andRikardsen 2008, 2012;Jensen et al 2014;Aarestrup et al, in press). The aim of the present study was to provide novel information on the marine habitat utilization during the summer season for sea trout that had previously performed one or more previous marine migrations, termed veteran migrants.…”

Section: Introductionmentioning

confidence: 99%

Marine migration and habitat use of anadromous brown trout (Salmo trutta)

Eldøy

Davidsen

Thorstad

et al. 2015

Can. J. Fish. Aquat. Sci.

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The biology and ecology of anadromous brown trout (Salmo trutta) at sea is poorly understood. This study provided information on spatial and temporal distribution of sea trout in the ocean. The behaviour of 115 individuals (veteran migrants, 270–700 mm) was tracked by using acoustic telemetry in a fjord system during April–September in 2012–2013. Overall, fish spent 68% of their marine residence time close to river mouths (<4 km). Most fish registrations (75%) were in nearshore habitats, but pelagic areas were also used. The maximum migration distance of tagged fish was categorized as short (<4 km from river mouth, 40% of fish), medium (4 – ∼13 km, 18% of fish), or long (>∼13 km, 42% of fish). Long-distance migrants had poorer body condition in spring prior to migration, used pelagic areas more often, and returned earlier to fresh water than short- and medium-distance migrants. Marine residence time was 7–183 days and was positively correlated to body length and smolt age, but negatively correlated to the date of sea entry.

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The migratory behaviour of wild sea trout (Salmo trutta L.) smolts in the estuary of the River Conwy, North Wales

Cited by 36 publications

References 9 publications

Migration speeds and orientation of Atlantic salmon and sea trout post-smolts in a Norwegian fjord system

Migration speeds and orientation of Atlantic salmon and sea trout post-smolts in a Norwegian fjord system

Food of anadromous brown trout at sea

Marine migration and habitat use of anadromous brown trout (Salmo trutta)

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