The relative importance of enhancement to the production of Salmon on Iturup Island (Kuril Islands, Russia)

Klovach, N. V.; Leman, V. N.; Гордеев, И. И.

doi:10.1111/raq.12493

Cited by 13 publications

(2 citation statements)

References 16 publications

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“…Between 1920 and 1944, the Etorofu hatchery, the most representative, produced 654 million fertilised eggs from 495 thousand parent chum salmon and released 602 million fries. Currently, Russia operates the largest chum salmon hatchery programme on this island, with 14 salmon hatcheries producing 240-250 million juveniles per year, and almost all chum salmon returning to the island are hatchery fish (Klovach et al, 2021). Japanese salmon seed production methods and facilities have been inherited in the island.…”

Section: Discussionmentioning

confidence: 99%

Hatcheries to high seas: climate change connections to salmon marine survival

Kitada,

Myers,

Kishino

2023

Preprint

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Pacific salmon (Oncorhynchusspp.) are exposed to environmental and anthropogenic stresses due to their wide geographic distribution, long migrations, and complex life histories. Understanding how these stressors interact to affect population abundance is essential for conservation and sustainable management of salmon. We investigate the causal effects on population dynamics of hatchery-enhanced Japanese chum salmon (O. keta), focusing on the period of sharp decline since the early 2000s and the rebound in 2022. We used 50 years of fishery and hatchery release data and 40 years of high-resolution SST datasets in 30 coastal areas in Japan, as well as monthly mean SST data along the Japanese chum salmon migration route in the high seas. We provide initial evidence that SST at release and that in the migration route, size at release, northward expansion of a piscivorous fish, and intraspecific competition influence the abundance of Japanese chum salmon. The sudden increase in 2022 was driven by an increase in Age-4 fish. The age structure shift towards younger age at maturity was observed in all areas except the Honshu Pacific and was particularly pronounced in the Hokkaido Sea of Japan and the Sea of Okhotsk and, where winter SST in the North Pacific and the Gulf of Alaska had a positive effect on return rates. Size at release and Russian chum salmon also had a positive effect. On the other hand, SST at release and yellowtail (Seriola quinqueradiata), as well as summer SST in the Sea of Okhotsk had a negative effect on return rate. Our regression model predicted the return rate well, while explaining 43-75% of the variation in regional populations. Our results highlight winter SST as a driver of younger age at maturity but the trade-off between returned fish and body size.

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Section: Discussionmentioning

confidence: 99%

Hatcheries to high seas: climate change connections to salmon marine survival

Kitada,

Myers,

Kishino

2023

Preprint

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“…Extensive fishing is going on in the Bering Sea and the Sea of Okhotsk for valuable fish such as salmon, Oncorhynchus spp. (Salmonidae) (Klovach et al, 2021), walleye pollock, Gadus chalcogrammus Pallas, 1814 (Gadidae), Pacific herring, Clupea pallasii Valenciennes, 1847 (Clupeidae), Pacific saury, Cololabis saira (Brevoort, 1856) (Scomberesocidae), chub mackerel, Scomber japonicus (Houttuyn, 1782) (Scombridae), and halibuts, Hippoglossus spp. and Atheresthes spp.…”

Section: Introductionmentioning

confidence: 99%

Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

Gordeev,

Sokolov

2023

Invertzool

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During the parasitological survey on the research vessel Professor Kaganovsky, the western part of the Bering Sea and the southern part of the Sea of Okhotsk was investigated for fish infection by parasites. In total, 1083 specimens of 17 species of teleosts and salmon shark Lamna ditropis were dissected, in which 32 species of parasites were found. The plerocercoids Pelichnibothrium speciosum s. lato prevailed in the Bering Sea. In the Sea of Okhotsk, the maximum intensity and prevalence of infection were noted for P. specioum s. lato, Anisakis sp. and Echinorhynchus gadi s. lato. The difference in the number of studied fish species in the Bering and Okhotsk Seas (14 vs 9) significantly affected the species diversity of noted parasites (28 vs 18). Teleosts caught in the coastal area and the ones performing vertical migrations to some degree differed in terms of infection pattern, primarily due to digeneans component. Macroparasites of the crested sculpin Blepsias bilobus were studied for the first time, and 20 new records were made on the infection of previously studied fish species. Parasite fauna of fish in the epipelagic zone of the western part of the Bering Sea and the southern part of the Sea of Okhotsk is characterized by significant intensity, however, relatively poor species diversity.

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Human footprints at hadal depths: interlayer and intralayer comparison of sediment cores from the Kuril Kamchatka trench

Abel

Primpke

et al. 2022

Science of The Total Environment

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The relative importance of enhancement to the production of Salmon on Iturup Island (Kuril Islands, Russia)

Cited by 13 publications

References 16 publications

Hatcheries to high seas: climate change connections to salmon marine survival

Hatcheries to high seas: climate change connections to salmon marine survival

Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

Human footprints at hadal depths: interlayer and intralayer comparison of sediment cores from the Kuril Kamchatka trench

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