Early Marine Migration of Juvenile Chum Salmon Along the Pacific Coast of Eastern Hokkaido

Kasugai, Kiyoshi; Saneyoshi, Hayato; Aoyama, Tomoya; Shinriki, Yoshihito; Iijima, Anai; Miyakoshi, Yasuyuki

doi:10.23849/npafcb6/61.72

Cited by 5 publications

(7 citation statements)

References 90 publications

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“…The species detected in this study add more information to the findings of previous reports on zooplankton (Asami et al, 2007; Hikichi et al, 2018; Hirai et al, 2015, 2017; Pinchuk & Paul, 2000), harmful algal species (Sildever et al, 2019; Stonik & Orlova, 2013), winter microalgal communities (Yan et al, 2022), and protists in general (Matsumoto et al, 2021). Using zooplankton as an example, similar to previous studies from the same sampling location, most of the OTUs were associated with copepods (especially calanoids), Polychaeta, and Hydrozoa (Hirai et al, 2015, 2017).…”

Section: Discussionsupporting

confidence: 82%

Eight years of weekly eDNA monitoring in the North‐Western Pacific

Sildever,

Nishi,

Tazawa

et al. 2023

Environmental DNA

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Detection of marine organisms based on environmental DNA (eDNA) has expanded the knowledge of species richness, distribution, and appearance patterns. We used eDNA data from a single location sampled weekly over 8 years to detect as many species as possible, and investigate their appearance patterns and associations with biotic and abiotic factors. We detected >2500 operational taxonomic units (OTUs) associated with unique species from nine supergroups. The dominating currents that differ significantly in temperature, salinity, and nutrient concentrations structured the richness of the OTUs. We further detected sporadic and seasonal or continuous presence among the OTUs connected with a single species. This study shows that the long‐term eDNA‐based monitoring approach provides comprehensive knowledge of the species present as well as their associations with biotic and abiotic factors.

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Section: Discussionsupporting

confidence: 82%

Eight years of weekly eDNA monitoring in the North‐Western Pacific

Sildever,

Nishi,

Tazawa

et al. 2023

Environmental DNA

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“…8), there were great annual variations in both indices. Additional regional surveys in the Kushiro coast in the eastern region of the Pacifi c Ocean also showed that the distribution of juvenile chum salmon was related to coastal seawater temperature aff ected by the cold Coastal Oyashio Current (Kasugai et al 2016). In contrast, western regions showed no signifi cant correlations, although negative correlations were found in the mid-and southern regions of the Japan Sea (Fig.…”

Section: Results Of Coastal Surveymentioning

confidence: 91%

Adapting Hokkaido Hatchery Strategies to Regional Ocean Conditions Can Improve Chum Salmon Survival and Reduce Variability

Nagata¹,

Miyakoshi²,

Fujiwara³

et al. 2016

NPAFC Bull.

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“…Water temperature also affects the temporal and spatial distributions of predatory fishes and juvenile salmon in coastal waters, which may be linked to salmon mortality (Emmett et al, 2006) and migration (Bøe et al, 2019; Byron & Burke, 2014). In coastal waters off Abashiri and Kushiro, eastern Hokkaido, juvenile chum salmon residing within 1 km of shore commence their offshore migration when SST exceeds 8°C (Kasugai et al, 2016; Nagata et al, 2007). The potential effects of sea temperature on salmon survival are so many and varied, and they probably work in conjunction with other factors such as metabolism, food supply, and predator encounters.…”

Section: Discussionmentioning

confidence: 99%

Optimum timing and size at release of chum salmon: Improving survival by modifying hatchery practices

Saito

2022

Fisheries Oceanography

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An existing conceptual model that assessed the timing of and size at release of juvenile Japanese chum salmon in Japanese waters is modified using data obtained from young salmon collected in coastal waters off Kombumori, eastern Hokkaido, Japan. The early life histories of Tokachi River late‐migrating chum salmon are estimated based on microstructural analysis of thermally marked otoliths from recaptured fish. A revised model is presented that reveals the optimal timing of and size at release of chum salmon juveniles to be dependent upon their size at sea entry and sea surface temperature (SST) near Tokachi River mouth. Juvenile salmon are assumed to grow at a fixed rate after sea entry and to reach a target fork length upon arrival in Kombumori waters when SST conditions are within a specific optimal range. However, because of annual variation in SST, the size at and timing of juvenile chum salmon sea entry following their release from hatcheries represents a moving target, which flexible hatchery release practices are required to meet. Return rates of adult chum salmon to Tokachi River correlate positively with the number of days elapsed between the period when SST is suitable near the river mouth where they enter the sea, and SST conditions in Kombumori waters, which suggests that in years when SST increases rapidly the survival of salmon tends to decline. Windows of optimal times of and sizes at release are proposed for juvenile chum salmon to improve their survival and hatchery success.

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Early Marine Migration of Juvenile Chum Salmon Along the Pacific Coast of Eastern Hokkaido

Abstract: This book that contains 38 research articles on marine ecology of Pacific salmon and steelhead trout, is dedicated to the International Year of the Salmon and is the first scientific publication that contributes to the library of the project.

Cited by 5 publications

References 90 publications

Eight years of weekly eDNA monitoring in the North‐Western Pacific

Eight years of weekly eDNA monitoring in the North‐Western Pacific

Adapting Hokkaido Hatchery Strategies to Regional Ocean Conditions Can Improve Chum Salmon Survival and Reduce Variability

Optimum timing and size at release of chum salmon: Improving survival by modifying hatchery practices

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