The Atlantic salmon (Salmo salar L.) of the North Esk with particular reference to the relationship between both river and sea age and time of return to home waters

Shearer, William M.

doi:10.1016/0165-7836(90)90017-p

Cited by 42 publications

(55 citation statements)

References 2 publications

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“…Results from the present study are in accordance with the general migration pattern of different sea‐age groups. In the River Teno, maiden 3SW Atlantic salmon ascend earlier than maiden 2SW fish, a phenomenon also observed by Trépanier et al (1996) and Shearer (1990). Differences in run timing between certain sea‐age groups, however, are small and all sea‐age groups, including repeat spawners, have overlapping migration timing.…”

Section: Discussionmentioning

confidence: 75%

Previously spawned Atlantic salmon ascend a large subarctic river earlier than their maiden counterparts

Niemelä

Orell

Erkinaro

et al. 2006

Journal of Fish Biology

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Spawning migration timing of maiden Atlantic salmon Salmo salar and previous spawners was analysed in the catches in 1989-2004 in the large subarctic River Teno in the northernmost parts of Finland and Norway. The hypothesis was that the migration timing of previous spawners and their maiden counterparts is similar, with the migration timing similar between sexes. In most cases, however, previous spawners were observed to migrate into the River Teno and its tributaries earlier than their maiden counterparts. The difference in run timing was especially evident between maiden one-sea-winter (1SW) Atlantic salmon and the corresponding group of previous spawners [1S1, 1 year at sea (1) followed by first spawning (S) and reconditioning period of 1 year (1) at sea and second spawning run] for both sexes in the River Teno and in its two tributaries. The same was also evident between 2SW maiden and 2S1 previous spawning female Atlantic salmon in the River Teno. Females showed earlier spawning migration than males both in previous spawners and maiden Atlantic salmon. Different maiden sea-age classes also showed differences in run timing as multi-sea-winter fish (2-4SW) ascended earlier than 1SW fish but the timing of 1S1 and 2S1 previous spawning females coincided. The results suggest that run timing of Atlantic salmon may not be strictly genetically fixed as previous spawners ascend earlier than they did on their first spawning migration as maiden fish, and indicated that the closeness of the reconditioning area of postspawners to the river of origin resulted in an early ascent. Run timing of different sea-age groups has major management implications if the populations are heavily exploited with numerous fishing methods in different periods of the fishing season, as in the River Teno system.

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Section: Discussionmentioning

confidence: 75%

Previously spawned Atlantic salmon ascend a large subarctic river earlier than their maiden counterparts

Niemelä

Orell

Erkinaro

et al. 2006

Journal of Fish Biology

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“…Large multi‐sea‐winter (MSW salmon), having spent 2–5 years in the sea, often arrive to fresh water earlier in the season than smaller one‐sea‐winter (1SW, ‘grilse’) salmon (Shearer 1990; Niemelä et al. 2006).…”

Section: Introductionmentioning

confidence: 99%

Temporally stable population-specific differences in run timing of one-sea-winter Atlantic salmon returning to a large river system

Vähä

Erkinaro²,

Niemelä³

et al. 2010

Evolutionary Applications

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The understanding of migration patterns can significantly contribute to conservation and management. The spawning migrations of Atlantic salmon (Salmo salar) cover thousands of kilometers from the feeding areas at sea to their natal rivers to reproduce. Migrating salmon are exposed to intensive harvest, but little is known of the population-specific differences in migration behavior. In this study, timing of return migration was investigated among one-sea-winter Atlantic salmon within a river system. By utilizing knowledge of the genetic population structure, population of origin was reliably identified for c. 1500 fish caught in mixed stock fisheries after adopting an approach to minimize the complications arising from potential nonsampled populations. Results demonstrated significant and temporally stable differences among populations as well as between sexes. Generally, female salmon from tributary populations entered fresh water first. Run timing was not however related to in-river migration distance. Rather, one-sea-winter salmon from larger populations and with a higher proportion of multi-sea-winter females arrived later in the season. These findings are a significant step toward a more thorough understanding of the salmon migration behavior and behavioral ecology, providing concrete tools for the management and conservation of the remaining indigenous Atlantic salmon stocks.

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“…In other anadromous salmonids, older and larger individuals tend to migrate upriver before younger and smaller ones (Atlantic salmon (Salmo salar) : Shearer 1990;Klemetsen et al 2003; Pacific salmon (Oncorhynchus spp.) : Quinn 2005).…”

Section: Timing Of Saltwater-freshwater Transitions and Wellington Bamentioning

confidence: 99%

Preference for nearshore and estuarine habitats in anadromous Arctic char (Salvelinus alpinus) from the Canadian high Arctic (Victoria Island, Nunavut) revealed by acoustic telemetry

Moore

Harris

Kessel

et al. 2016

Can. J. Fish. Aquat. Sci.

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Abstract:We used an array of fixed acoustic receivers (N = 42) to track the summer marine movements of 121 anadromous Arctic char (Salvelinus alpinus) equipped with acoustic transmitters at three locations in the Cambridge Bay region, where commercial and subsistence fisheries target the species. The timing of transitions between salt and fresh water was influenced by the putative river of origin of tagged individuals, but not by their size or sex. Females, however, were more likely to remain proximate to rivers where they were tagged throughout the summer. A majority of fish migrated west from their rivers of origin, primarily moving between estuarine environments. Individuals occupied estuaries for several days between bouts of marine movement, and these periods of residency coincided with spring tides in some estuaries. We also recorded increased numbers of detections on receivers located less than 1.5 km from the coast, indicating a preference for nearshore habitats. Finally, we report evidence of extensive stock mixing throughout the summer, including at known fishing locations and periods, a finding with implications for fisheries management.Résumé : Les mouvements estivaux en milieu marin de 121 ombles chevaliers (Salvelinus alpinus) anadromes équipées de transmetteur metteur acoustique issus de trois sites de marquages ont été suivis grâce à un réseau de récepteurs acoustiques (N = 42) ancrés dans la région de Cambridge Bay. Les périodes de transition entre les eaux douces et salées étaient influencées par la rivière d'origine des individus, mais pas par leur taille ou leur sexe. Cependant une proportion plus grande de femelles restait près de leur rivière de capture pour tout l'été. Une majorité d'individus ont migré vers l'ouest se déplaçant d'estuaire en estuaire. Ces périodes de résidence en estuaires duraient souvent plusieurs jours, et coïncidaient avec les marées de vives-eaux dans certains estuaires. Dans toute la zone d'étude, les récepteurs situés à moins de 1,5 km de la côte ont enregistré un plus grand nombre de détections, indiquant une préférence pour les habitats côtiers. Finalement, nos données révèlent un mélange des stocks durant la période estivale, notamment dans des zones et périodes de pêches, un résultat ayant d'importantes répercus-sions pour la gestion des pêches.

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The Atlantic salmon (Salmo salar L.) of the North Esk with particular reference to the relationship between both river and sea age and time of return to home waters

Cited by 42 publications

References 2 publications

Previously spawned Atlantic salmon ascend a large subarctic river earlier than their maiden counterparts

Previously spawned Atlantic salmon ascend a large subarctic river earlier than their maiden counterparts

Temporally stable population-specific differences in run timing of one-sea-winter Atlantic salmon returning to a large river system

Preference for nearshore and estuarine habitats in anadromous Arctic char (Salvelinus alpinus) from the Canadian high Arctic (Victoria Island, Nunavut) revealed by acoustic telemetry

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