Seasonal migrations of pacific cod Gadus macrocephalus (Gadidae) off the eastern coast of Kamchatka

Savin, A. B.

doi:10.1134/s0032945207080085

Cited by 5 publications

(4 citation statements)

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“…5). Cod is a migratory species and migrates seasonally due to breed and to feed (Alderdice and Forrester, 1971;Savin, 2007). Therefore, common seasonal closure may not require to recover cod stock (Clarke et al, 2015).…”

Section: Nature Of Stock Recovery During Fsrpmentioning

confidence: 99%

Integrated management of seasonal fishing closures and fisheries stock rebuilding plans for recovering marine stocks in Korea

Lee¹,

Sakib²,

Rahman³

2020

JEB

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Section: Nature Of Stock Recovery During Fsrpmentioning

confidence: 99%

Integrated management of seasonal fishing closures and fisheries stock rebuilding plans for recovering marine stocks in Korea

Lee¹,

Sakib²,

Rahman³

2020

JEB

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“…Pacific cod (Gadus macrocephalus) is an important fishery resource with high ecological and economic value in marine ecosystems (Ueba et al 2004;Savin 2007;Fissel et al 2017). They are widely distributed throughout the North Pacific and feed on various fishes and invertebrates, particularly walleye pollock (Gadus chalcogrammus), Pacific herring (Clupea pallasii), shrimps, and crabs (Albers and Anderson 1985;Yamamura et al 1993;Yang 2004;Poltev and Stominok 2008;Urban 2012;Gray et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan

Wang

Chimura

Sadayasu

et al. 2022

Marine Biology Research

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The ontogenetic and interannual variations in the diet and feeding strategy of Pacific cod (Gadus macrocephalus) were examined based on 1,302 specimens collected by a trawling net off the southern coast of Hokkaido from late June to early July during 2016-2020. The diet comprised 63 species (13 taxa). Fish was the most important prey, followed by decapod crustaceans. In 2016, walleye pollock (Gadus chalcogrammus) was the dominant fish prey species, while amphipods, decapods, and Japanese lanternfish (Notoscopelus japonicus) were prominent in the diet in 2017.Japanese sardine (Sardinops melanostictus) were more predominant during 2018-2020. An ontogenetic comparison of diet indicated that smaller individuals (£ 400 mm standard length, SL) preyed mainly on small prey items, such as decapod crustaceans and polychaetes, whereas larger individuals (> 400 mm SL) preyed mainly on fish. Moreover, prey size exhibited a significant increasing trend with predator body length. These results suggest that Pacific cod has a flexible feeding strategy that differs by life stage. The updated information on predator-prey relationships provided herein improves our understanding of energy flow in the marine ecosystem and could facilitate ecosystem-based fishery management strategies.

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“…Adult cod spawn in late winter and early spring, and in late spring they move to shallower, warmer waters near shore to recommence feeding. The distance and duration of these migrations can vary according to temperature, food availability, and bathymetry (Shimada and Kimura, 1994; Stepanenko, 1995; Savin, 2007). Datsky and Andronov (2014) and Barbeaux and Hollowed (2018) suggest that there is an ontogenetic gradient with higher densities of smaller cod in shallower waters (<100 m) and higher densities of larger cod in deeper waters (>200 m).…”

Section: Introductionmentioning

confidence: 99%

Size distribution of Pacific cod (Gadus macrocephalus) in the North Pacific Ocean over 6 millennia

et al. 2020

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In this paper, we compile estimates of cod size distributions based on zooarchaeological data and contemporary length-frequency data to look at variability in size composition through time across the North Pacific, from the northern Kuril Islands through the Aleutian Islands to southeast Alaska. The results suggest that a strong longitudinal trend in cod size has remained consistent over time, with the largest cod found to the west. We find that five of nine sites show that overall cod length and distribution of the largest fish remain relatively unchanged. Two sites where we find truncation of the length distributions—or loss of the largest fish—are places where the modern fisheries have the longest history and have been most intense, suggesting a potential for anthropogenic impacts on these local populations. We acknowledge two limitations in these data: (1) there are differences in selectivity between the ancient and modern fisheries; and (2) seasonal variability in fish availability was observed to be an important explanatory variable in the modern data set, but the season of harvest is poorly understood for the ancient collections. Therefore, while differences observed between the two data sets suggest possible anthropogenic influence on the size structure of Pacific cod, they are not conclusive.

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Seasonal migrations of pacific cod Gadus macrocephalus (Gadidae) off the eastern coast of Kamchatka

Cited by 5 publications

References 0 publications

Integrated management of seasonal fishing closures and fisheries stock rebuilding plans for recovering marine stocks in Korea

Integrated management of seasonal fishing closures and fisheries stock rebuilding plans for recovering marine stocks in Korea

Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan

Size distribution of Pacific cod (Gadus macrocephalus) in the North Pacific Ocean over 6 millennia

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