Comparison of coastal and river releases of Atlantic salmon smolts in the river Kokemäenjoki, Baltic Sea

Salminen, Matti; Erkamo, Esa

doi:10.1006/jmsc.1998.0411

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…Other than sizes at release, however, river strains and releasing sites were different between hatcheries or among years 14 . These factors may affect the survival of hatchery‐reared fish 19,20 . We speculate the effect of smolt size on postrelease survival is greater, and the large variation in mean smolt sizes made it possible to detect the relationship clearly (i.e.…”

Section: Discussionmentioning

confidence: 94%

Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou

2001

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SUMMARY: The relationship between mean weights of hatchery‐reared masu salmon Oncorhynchus masou smolts at release and the subsequent recovery rates by coastal commercial fisheries in Hokkaido, northern Japan, was investigated using the maximum likelihood method. A strongly positive correlation was observed, showing smolts with a mean of 32.6 g obtained an approximately 20‐fold recovery rate of those with a mean of 14.8 g. The model with log‐transformed independent variable (Yi = –11.237 + 4.239 ln Xi) was selected as the most parsimonious model to represent the release size (Xi) and recovery rate (Yi) relationship.

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Section: Discussionmentioning

confidence: 94%

Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou

2001

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“…; Skilbrei & Jørgensen ). Studies that have assessed recapture rates of hatchery‐reared salmon released for restocking purposes have also reported low recapture rates by fishermen within the first year after release (Baltic Sea; Salminen & Erkamo ; Jutila et al . ).…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, fish traps and pelagic trawling are ineffective (Furevik et al 1990;Skilbrei & Jørgensen 2010). Studies that have assessed recapture rates of hatchery-reared salmon released for restocking purposes have also reported low recapture rates by fishermen within the first year after release (Baltic Sea; Salminen & Erkamo 1998;Jutila et al 2003). Estimates of recapture success and methods are limited for other salmonids, although Skilbrei (2012) reported recaptures rates of 25-43% of escaped rainbow trout caught by local fishermen in Norwegian fjords.…”

Section: Atlantic Salmon and Other Salmonidsmentioning

confidence: 99%

Recapturing escaped fish from marine aquaculture is largely unsuccessful: alternatives to reduce the number of escapees in the wild

Dempster

Arechavala-López

Barrett

et al. 2016

Reviews in Aquaculture

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Farmed fish that escape and mix with wild fish populations can have significant ecological and genetic consequences. To reduce the number of escaped fish in the wild, recapture is often attempted. Here, we review the behaviours of escapees post-escape, and how recapture success varies with escaped fish size, the size of the initial escape event and recapture methods. Success rates of fishing gears varied among species, with gill-nets and coastal barrier nets most effective for recapture of salmonids. Recapture success was strongly negatively correlated with both fish size and the number of fish escaped, regardless of species. Recapture success was universally low across all studied species (8%). Numerous tracking studies of escaped fish indicate that recapture efforts should be initiated within 24 h of an escape incident for highest recapture success. However, most large escape events are due to storms, which mean recapture efforts rarely start within this timeframe. Recapture of escaped fish is broadly ineffective in marine habitats, with rare exception. High bycatch rates during ineffective recapture attempts imply that large-scale recapture efforts should be weighed against the possibility of affecting wild fish populations negatively. We suggest three alternative approaches to reduce escapee numbers in wild habitats: (i) protect populations of predatory fish around sea-cage farms from fishing, as they prey upon smaller escapees; (ii) construct impact offset programmes to target recapture in habitats where escapees can be efficiently caught; and (iii) ensure technical standards are legislated so that fish farmers invest in preventative technologies to minimize escapes.

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“…19,20 We speculate the effect of smolt size on postrelease survival is greater, and the large variation in mean smolt sizes made it possible to detect the relationship clearly (i.e. 14 These factors may affect the survival of hatchery-reared fish.…”

Section: Effect Of Smolt Size On Postrelease Survival Of Hatchery-reamentioning

confidence: 94%

Historical and Current Hatchery Programs and Management of Chum Salmon in Hokkaido, Northern Japan

Miyakoshi

Nagata

Kitada

et al. 2013

Reviews in Fisheries Science

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The relationship between mean weights of hatchery-reared masu salmon Oncorhynchus masou smolts at release and the subsequent recovery rates by coastal commercial fisheries in Hokkaido, northern Japan, was investigated using the maximum likelihood method. A strongly positive correlation was observed, showing smolts with a mean of 32.6 g obtained an approximately 20-fold recovery rate of those with a mean of 14.8 g. The model with log-transformed independent variable (Y i = -11.237 + 4.239 ln X i ) was selected as the most parsimonious model to represent the release size (X i ) and recovery rate (Y i ) relationship. KEY WORDS: Akaike information criterion, masu salmon, maximum likelihood method,Oncorhynchus masou, smolt size.

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Comparison of coastal and river releases of Atlantic salmon smolts in the river Kokemäenjoki, Baltic Sea

Cited by 7 publications

References 19 publications

Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou

Effect of smolt size on postrelease survival of hatchery-reared masu salmon Oncorhynchus masou

Recapturing escaped fish from marine aquaculture is largely unsuccessful: alternatives to reduce the number of escapees in the wild

Historical and Current Hatchery Programs and Management of Chum Salmon in Hokkaido, Northern Japan

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