Differences in sea migration between wild and reared Atlantic salmon (Salmo salar L.) in the Baltic Sea

Jutila, Eero; Jokikokko, Erkki; Kallio‐Nyberg, Irma; Saloniemi, Irma; Pasanen, Pentti

doi:10.1016/s0165-7836(02)00169-8

Cited by 53 publications

(58 citation statements)

References 28 publications

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“…Typically, the recaptures of Carlin-tagged, returning adults are in the range of 0.5 to 3% (Jutila et al 2003, Jonsson & Jonsson 2011, covering the range of variation in the present experiment. These low recapture rates decrease the power of the results, and may be partly influenced by the handling and tagging of the smolts (Hansen & Jonsson 1988).…”

Section: Discussionmentioning

confidence: 86%

Maternal inheritance influences homing and growth of hybrid offspring between wild and farmed Atlantic salmon

Jönsson¹,

Jönsson²

2017

Aquacult. Environ. Interact.

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The occurrence of domesticated organisms in nature is a major biological issue. Many can survive and reproduce with wild conspecifics, but little is known about the ecology of the hybrid offspring. Here, we investigated recapture, homing and growth of the released offspring of farmed (domesticated) and wild Atlantic salmon Salmo salar as well as their crosses. The fish were hatchery-reared for 1 yr and released as smolts in the River Imsa, Norway, the home river of the wild fish. The released fish migrated to the ocean. Many disappeared, but between 0.6 and 2% were sampled on their return as adults 1 or 2 yr later. Homing to the river of release was low for farmed salmon (88% strays). Among hybrids, having a wild mother provided increased homing accuracy (36% strays) relative to having a wild father (64% strays). Offspring of the local River Imsa salmon exhibited the best homing (28% strays). The growth capacity of the farmed salmon appeared to be not fully utilized in nature, as there was little difference in maximum size between wild and farmed salmon. However, minimum size at maturity was larger for farmed than wild conspecifics. Inheritance from a farmed mother increased minimum size of the hybrids versus that of the pure farmed salmon. Thus, maternal inheritance from domesticated, farmed salmon decreased homing and increased minimum size at adulthood of the offspring, making domesticated salmon a risk for locally adapted salmon in nature.

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Section: Discussionmentioning

confidence: 86%

Maternal inheritance influences homing and growth of hybrid offspring between wild and farmed Atlantic salmon

Jönsson¹,

Jönsson²

2017

Aquacult. Environ. Interact.

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“…The migration analyses were based on the assumption that the site and time of the recoveries indicates the migration pattern. This is likely to be valid, because salmon fishing covers the whole migration area and all migration seasons (Jutila et al, 2003a).…”

Section: Methodsmentioning

confidence: 99%

Effect of hatchery rearing and environmental factors on the survival, growth and migration of Atlantic salmon in the Baltic Sea

Kallio‐Nyberg¹,

Saloniemi

Jutila³

et al. 2011

Fisheries Research

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“…The home rivers of all these stocks drain into the Bothnian Bay, the northernmost part of the Baltic Sea, and the stocks have very similar migration patterns. The fish from all these stocks undertake their feeding migration to the Baltic Main Basin, and return as spawners to their home rivers early in the summer, mainly during a few weeks in June [6,25].…”

Section: Salmon Stocksmentioning

confidence: 99%

“…Hybridization of reared and wild fish may also change the spawning age and other lifehistory traits of the stocks [21][22][23][24]. Domestication selection in hatcheries tends to favor a high growth rate and early sexual maturity [21,25,26], and fisheries usually select against a large size and later spawning age [27][28][29]. A trend towards younger spawners was observed in the 20 th century for many salmon stocks, as a marked decline in either the proportion of older, multi-sea-winter (MSW), or of repeatedly spawning salmon [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

Kallio‐Nyberg¹,

Koljonen²,

Saloniemi³

2014

TOFISHSJ

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Origin and age was determined for individual fish caught in offshore catches of Atlantic salmon stocks (Salmo salar L.) in the Baltic Sea over the years [2000][2001][2002][2003][2004][2005][2006][2007][2008][2009]. DNA microsatellite loci and smolt age were used to probabilistically assign returning spawners to their stock of origin. Data for this study were based on approximately 2600 catch samples of the five most common wild and four sea-ranched, hatchery-reared stocks. Spawning age, and sex ratio differed both within and between these wild, and sea-ranched groups. The females were mainly (78.7%) two sea-winters old and the males usually (68.7%) only one sea-winter old. In both sexes, the mean age at maturity was lower in the hatchery-reared, sea-ranched stocks than in naturally reproducing stocks. In the 2000s, there was a weak decreasing trend in the male spawning age, but not in that of females. The sex-ratio of the spawners was female dominant in the naturally reproducing stocks, but male dominant in hatchery-reared stocks. Published historical data from two of the same rivers suggest that the majority of males were multi-sea-winter spawners in the 1930s, and variation in the age distribution of the spawners has become narrower and skewed towards a younger age in the present data (2000-2009) compared to the earlier situation.

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Differences in sea migration between wild and reared Atlantic salmon (Salmo salar L.) in the Baltic Sea

Cited by 53 publications

References 28 publications

Maternal inheritance influences homing and growth of hybrid offspring between wild and farmed Atlantic salmon

Maternal inheritance influences homing and growth of hybrid offspring between wild and farmed Atlantic salmon

Effect of hatchery rearing and environmental factors on the survival, growth and migration of Atlantic salmon in the Baltic Sea

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

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