Riverine and early marine survival of stocked salmon smolts, <i>Salmo salar</i> L., descending the Testebo River, Sweden

Serrano, Ignacio; Rivinoja, Peter; Karlsson, Lars; Larsson, Sylvia H.

doi:10.1111/j.1365-2400.2009.00688.x

Cited by 34 publications

(37 citation statements)

References 37 publications

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“…Managers should consider avoiding stocking locations upstream of such facilities until these poor passage efficiencies can be remediated. These results strengthen the suggestion that recovery through stocking is probably unattainable until such a time that the underlying causes responsible for the decline of the population are adequately addressed (Serrano et al , 2009).…”

Section: Discussionsupporting

confidence: 83%

Surface trawl survey for U.S. origin Atlantic salmon Salmo salar

Sheehan

Renkawitz

Brown

2011

Journal of Fish Biology

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A surface trawl survey (2001-2005) in Penobscot Bay, Maine, U.S.A., and the nearshore Gulf of Maine waters was conducted to investigate early marine dynamics of a hatchery-dependent Atlantic salmon Salmo salar population from a severely modified river system. Data generated were used to evaluate the effect of stocking location and time on migration success and to describe the migratory pathways and environments that post-smolts traverse. Significant differences in early migration success were detected among different stocking groups, but subsequent marine survival was independent of stocking group. While the post-smolt population was primarily composed of hatchery origin smolt-stocked fish, other life-stage stocking strategies (i.e. parr stocking) represented a higher proportion of the population than previously assumed. Catch distribution suggests evidence of an initial marine migratory pathway out of the dynamic Penobscot Bay environment. The hypothesized benefits of a predator refuge based on the co-occurring species complex is considered minimal for emigrating post-smolts given a mismatch in the size overlap among species and low abundance of other co-occurring diadromous populations. These data can be used to modify current management actions to optimize S. salar recovery and inform future research agendas.

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Section: Discussionsupporting

confidence: 83%

Surface trawl survey for U.S. origin Atlantic salmon Salmo salar

Sheehan

Renkawitz

Brown

2011

Journal of Fish Biology

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“…osmoregulatory incompetence) cannot be ruled out. High estuarine predation is commonly reported in smolt migration studies (Hvidsten & Møkkelgjerd, ; Serrano et al ., ; Hedger et al ., ; Thorstad et al ., ). Reduced numbers of S. salar were detected within the array in 2014 despite this not being related to size.…”

Section: Discussionmentioning

confidence: 97%

Does size matter? A test of size‐specific mortality in Atlantic salmon Salmo salar smolts tagged with acoustic transmitters

Newton

Barry

Dodd

et al. 2016

Journal of Fish Biology

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Glasgow, Rowardennan, Glasgow, G63 0AW UK.

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“…As the smolts seem to prey upon naturally occurring objects in the drift and/or river bottom, it is unlikely that the prey availability is the reason for the observed variability in the amount of the empty stomachs. A possible explanation for the decreased feeding in the presence of an abundant food supply could be the elevated risk of predation during the inriver and estuary smolt migration (Jepsen et al 1998;Koed et al 2006;Serrano et al 2009b). Although there is a large variation in reported predation-induced mortality rates, several studies have found mortality to be as high as 50% or more (e.g.…”

Section: Discussionmentioning

confidence: 99%

Feeding of wild and hatchery reared Atlantic salmon (Salmo salar L.) smolts during downstream migration

Larsson

Linnansaari

Vatanen³

et al. 2011

Environ Biol Fish

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In general, hatchery salmonid smolts experience higher mortality during migration than wild smolts, which is suggested to be due to domestication effects and that hatchery fish lack experience of the natural environment. However, possible differences in feeding during smolt migration between hatchery and wild smolts have rarely been addressed. We compared the number of feeding smolts and stomach fullness among wild Atlantic salmon smolts, hatchery-reared smolts released as 1-year-old parr, and hatcheryreared smolts released as 2-year-old smolts during their descent to sea in River Tornionjoki. In addition, estimations of prey selection among the smolt groups were conducted. A high proportion of wild smolts and smolts stocked as parr actively fed during the smolt migration. A lower proportion of smolts stocked as smolts was feeding and their stomach fullness were much reduced in comparison with the two other groups. The study also indicated that the feeding of migrating smolts is selective rather than opportunistic.In conclusion, this study suggests that stocked 2-yearold smolts may enter sea with an inferior foraging behaviour and it is a possibility that this may contribute to the observed low post-smolt survival in the Baltic Sea.

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Riverine and early marine survival of stocked salmon smolts, Salmo salar L., descending the Testebo River, Sweden

Cited by 34 publications

References 37 publications

Surface trawl survey for U.S. origin Atlantic salmon Salmo salar

Surface trawl survey for U.S. origin Atlantic salmon Salmo salar

Does size matter? A test of size‐specific mortality in Atlantic salmon Salmo salar smolts tagged with acoustic transmitters

Feeding of wild and hatchery reared Atlantic salmon (Salmo salar L.) smolts during downstream migration

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