Walleye pollock: global overview

Bulatov, O. A.

doi:10.1007/s12562-014-0715-0

Cited by 19 publications

(4 citation statements)

References 8 publications

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Section: Introductionmentioning

confidence: 99%

“…Long-term changes in pollock production worldwide have exhibited a decreasing trend since the late 1980s, attributed to global warming and overfishing of both juvenile and adult individuals [6][7][8]. However, pollock production in Japan and Russia has either remained stable or slightly increased after 2000 [8], while the pollock catch in the United States and Canada, situated in the North Pacific, has not continued to decline since 2000 but has instead maintained a stable level [8]. In Korean waters, pollock fisheries have also undergone a drastic decline since the late 1980s, with catches plummeting below 1000 tons, nearly reaching extinction since 2000, in contrast to production in other countries [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

Jung,

Park,

Yang

et al. 2024

Water

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The decline in walleye pollock (Gadus chalcogrammus) stocks in Korean waters is a major concern for fishery conservation and management. However, the causes and mechanisms of this collapse remain unclear. This study investigated the complex dynamics influencing the abundance of walleye pollocks in the East Sea of Korea over several decades, by analyzing data from long-term changes in biological factors including composition of length and sex, catch, and oceanographic condition. Prior to the mid-1980s, the catch ratio of juveniles was higher than that of adults, with a higher proportion of females in both juvenile and adult catches compared to males. Especially, high fishing pressure on female individuals can be an important factor contributing to declining reproduction. Consequently, after the mid-1980s, there was a sudden decline in juvenile pollock catches. In the late 1980s, there was a rapid increase in sea surface temperature (SST) in the spawning grounds, resulting in a decrease in both the duration of suitable temperature for spawning and the regional proportion for suitable spawning conditions. Consequently, the decline in pollock stocks after the late 1980s due to overfishing of pollock in the mid-1980s was further exacerbated by the effects of SST warming after the late 1980s. These findings highlight the impact of overfishing and environmental factors on pollock stocks and indicate the need for appropriate fishery management practices to ensure the sustainable use of fishery resources.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

Jung,

Park,

Yang

et al. 2024

Water

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“…Alaska pollock ( Gadus chalcogrammus ) is the top-fished species worldwide with main fishing grounds in the Bering Sea and Sea of Okhotsk ( 26 ). It is ecologically important in the food web by acting as prey for top predators (e.g., sea lions, whales, other marine mammals, and seabirds) ( 27 , 28 ) and therefore plays an important role in the ecosystem of the Bering Sea.…”

Section: Introductionmentioning

confidence: 99%

Elder fish means more microplastics? Alaska pollock microplastic story in the Bering Sea

Ding

Ran

et al. 2023

Sci. Adv.

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Marine microplastics are an increasingly big concern. We analyze the occurrence of microplastics in Alaska pollock ( Gadus chalcogrammus ) across 2+ to 12+ ages sampled from the Bering Sea. Results show that 85% of the fish have ingested microplastics and elder fish ingest more with over a third of microplastics in the 100- to 500-micrometer size range, indicating the prevalence of microplastics in Alaska pollock distributed in the Bering Sea. A positive linear relationship is obtained between fish age and microplastic size. Meanwhile, the number of polymer types increases in elder fish. The link between microplastic characteristics in Alaska pollock and the surrounding seawater suggests an extended spatial impact of microplastics. The impact of age-related microplastic ingestion on the population quality of Alaska pollock is still unknown. Therefore, we need to further investigate the potential impact of microplastics on marine organisms and the marine ecosystem, taking age as an important factor.

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“…There are also occasional records of this species in the North Atlantic and adjacent Arctic, including the Norwegian and Barents seas [6,7]. Walleye pollock is a valuable commercial species, occupying a leading position in terms of catch both in the North Pacific and in world fisheries as a whole [8][9][10][11][12]. In addition, it plays an important role in the ecosystems of the 2 of 18 North Pacific, participating in various trophic chains from invertebrates as consumer to predatory fish, marine mammals and birds as prey [1,2,13].…”

Section: Introductionmentioning

confidence: 99%

Walleye Pollock Gadus chalcogrammus, a Species with Continuous Range from the Norwegian Sea to Korea, Japan, and California: New Records from the Siberian Arctic

Орлов

Rybakov

Vedishcheva

et al. 2021

JMSE

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The first records of walleye pollock Gadus chalcogrammus Pallas, 1814 in the seas of the Siberian Arctic (the Laptev Sea, the Kara Sea, the southeastern Barents Sea), are documented. Information about the external morphology (morphometric and meristic characters), photos of sagittal otoliths and fish, and data on the sequences of the CO1 mtDNA gene are presented. The results of a comparative analysis indicate that walleye pollock caught in the Siberian Arctic do not differ in principle from North Pacific and North Atlantic individuals. Previous conclusions about the conspecificity of the walleye and Norwegian pollock Theragra finnmarchica are confirmed. New captures of walleye pollock in the Siberian Arctic allow us to formulate a hypothesis about its continuous species’ range from the coasts of Norway in the North Atlantic to the coasts of Korea, Japan, and California in the North Pacific. The few records of walleye pollock in the North Atlantic originate from the North Pacific due to the transport of early pelagic juveniles to the Arctic by currents through the Bering Strait and further active westward migrations of individuals which have switched to the bentho-pelagic mode of life.

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Walleye pollock: global overview

Cited by 19 publications

References 8 publications

The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

The Long-Term Dynamics of Walleye Pollock Stocks in Relation to Oceanographic Changes in the East Sea

Elder fish means more microplastics? Alaska pollock microplastic story in the Bering Sea

Walleye Pollock Gadus chalcogrammus, a Species with Continuous Range from the Norwegian Sea to Korea, Japan, and California: New Records from the Siberian Arctic

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