Migration of Pacific Rim Chum Salmon on the High Seas: Insights from Genetic Data

Seeb, Lisa W.; Crane, Penelope A.; Kondzela, Christine M.; Wilmot, Richard L.; Urawa, Shigehiko; Varnavskaya, Natalya V.; Seeb, James E.

doi:10.1023/b:ebfi.0000022900.82523.63

Cited by 50 publications

(49 citation statements)

References 15 publications

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“…However, it is important to note that chum salmon sizes increased during the mid-1990s while pink salmon abundance remained relatively high. It is recognized that these two species occupy distinctly different parts of the ocean, with chum salmon migrating much further east during their second year of life (Seeb et al 2004). Decreases in growth of Asiatic chum salmon stocks are evident only at older ages (0.3 and 0.4) when these fish are occupying distinctly different habitats compared to pink salmon (Kaeriyama 1996;Kaev 1999).…”

Section: Chum Salmon Abundance Dynamicsmentioning

confidence: 99%

Wild and hatchery reproduction of pink and chum salmon and their catches in the Sakhalin-Kuril region, Russia

Kaev

2011

Environ Biol Fish

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In the Sakhalin-Kuril region hatchery culture of pink and chum salmon is of great importance compared to other regions of the Russian Far East. During the last 30 years the number of hatcheries increased two-fold, and significant advances were made in hatchery technologies. As a result, chum salmon capture in regions where hatcheries operate (southwestern and eastern Sakhalin coasts, and Iturup Island) was 9 times as high during 2006-2010 than during 1986-1990, whereas wild chum salmon harvest markedly declined. Recent dynamics in pink salmon catch appear to track trends in natural spawning in monitored index rivers, suggesting natural-origin pink salmon play a dominant role in supporting the commercial fishery. It remains uncertain as to whether hatcheries have substantially supplemented commercial catch of pink salmon in this region, and I recommend continued research (including implementing mass marking and recovery programs) before decisions are made regarding increasing pink salmon hatchery production. Location of hatcheries in spawning river basins poses problems for structuring a management system that treats hatchery and wild populations separately. Debate continues regarding the existence and importance of density-dependent processes operating in the ocean environment and the role hatcheries play in these processes. Loss of critical spawning habitat for chum salmon in the Sakhalin-Kuril region has lead to significant declines in their abundance. I conclude by recommending increases in releases of hatchery chum salmon numbers in the region to help recover depressed wild populations and provide greater commercial fishing benefits in the region.

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Section: Chum Salmon Abundance Dynamicsmentioning

confidence: 99%

Wild and hatchery reproduction of pink and chum salmon and their catches in the Sakhalin-Kuril region, Russia

Kaev

2011

Environ Biol Fish

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“…In addition, our environment leaves " natural tags " in our bodies that can be deciphered for information about where we have been, including ratios of stable isotopes, chemical signatures in otoliths (Barnett -Johnson et al 2008 ), and even parasites (Timia 2007 ). Genetics are widely used for information about origins and mixing of stocks (Habicht et al 2007 ;Seeb et al 2004 ), and fatty acid ratios in the tissues of predators can help to identify the prey species and proportions eaten (Iverson et al 2004 ). These methods are very useful because (1) the marking is already done for us by nature, and (2) even the smallest larvae retain readable signatures.…”

Section: Acoustic T Racking In the C Ontext Of O Ther T Echnologiesmentioning

confidence: 99%

Tracking Fish Movements and Survival on the Northeast Pacific Shelf

Payne

Andrews

Chittenden

et al. 2010

Life in the World's Oceans

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“…It is thought that these salmon spend their second to penultimate years within the Gulf of Alaska, although some may migrate into the Bering Sea (Seeb et al 2004). Rising temperatures in their final spring appear to trigger a return migration to coastal areas (Myers et al 2007), with most fish arriving at their streams of origin during October to December.…”

Section: Introductionmentioning

confidence: 99%

Marine growth patterns of southern British Columbia chum salmon explained by interactions between density-dependent competition and changing climate

Debertin

Irvine

Holt

et al. 2017

Can. J. Fish. Aquat. Sci.

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Thirty-nine years of scale growth measurements from Big Qualicum River chum salmon (Oncorhynchus keta) in southern British Columbia demonstrated that competition and climate variation affect marine growth and age-at-maturity. A longitudinal study design that accounted for correlation among individuals revealed growth at all ages was reduced when the biomass of North American chum, sockeye (Oncorhynchus nerka), and pink salmon (Oncorhynchus gorbuscha) was high. When North Pacific Gyre Oscillation (NPGO) was positive, indicating increased primary productivity, predicted growth increased. Climate variation influenced competition effects. For instance, density-dependent competition effects increased when NPGO became more positive and Pacific Decadal Oscillation became more negative (indicating cool conditions), causing the greatest range in predicted scale size. Chum salmon are likely to exhibit continued reduction in growth at age due to increased ocean temperatures driven by climate change and high aggregate salmon biomass that includes hatchery releases. If evidence of biomass and climate effects presented here are common among Pacific salmon populations, reduction of hatchery releases should be considered. Résumé :Des mesures sur 39 ans de la croissance des écailles de saumons kétas (Oncorhynchus keta) de la Grande rivière Qualicum, dans le sud de la Colombie-Britannique, démontrent que la concurrence et les variations climatiques ont une incidence sur la croissance en mer et l'âge à la maturité. Un plan d'étude longitudinale qui tient compte de la corrélation entre individus révèle que la croissance à tous les âges est plus faible quand la biomasse des saumons kétas, sockeyes (Oncorhynchus nerka) et roses (Oncorhynchus gorbuscha) d'Amérique du Nord est élevée. Quand l'oscillation du tourbillon nord-pacifique (OTPN) est positive, indiquant une productivité primaire accrue, la croissance prédite augmente. Les variations du climat ont également une incidence sur ces effets de concurrence. Les effets de la concurrence dépendant de la densité augmentent quand l'OTPN devient plus positive et l'oscillation décennale du Pacifique, plus négative (indiquant des conditions fraîches), ce qui produit la plus grande fourchette de tailles d'écailles prédites. Il est probable que les saumons kétas continueront de présenter une diminution de la croissance selon l'âge en raison de la hausse des températures océaniques causée par les changements climatiques et de la forte biomasse totale de saumons incluant les individus issus d'écloseries. Si les indices d'effets de la biomasse et du climat relevés dans la présente étude s'avéraient répandus dans les populations de saumons du Pacifique, il serait pertinent d'examiner la possibilité de réduire les lâchers de poissons issus d'écloseries. [Traduit par la Rédaction]

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Migration of Pacific Rim Chum Salmon on the High Seas: Insights from Genetic Data

Cited by 50 publications

References 15 publications

Wild and hatchery reproduction of pink and chum salmon and their catches in the Sakhalin-Kuril region, Russia

Wild and hatchery reproduction of pink and chum salmon and their catches in the Sakhalin-Kuril region, Russia

Tracking Fish Movements and Survival on the Northeast Pacific Shelf

Marine growth patterns of southern British Columbia chum salmon explained by interactions between density-dependent competition and changing climate

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