Genetic differentiation of Pacific cod Gadus macrocephalus in the Sea of Okhotsk and in the Bering Sea

Смирнова, М. А.; Orlova, S. Yu.; Mugue, N. S.; Mukhametov, I. N.; Смирнов, А. А.; Орлов, А. М.

doi:10.1134/s1607672915060113

Cited by 8 publications

(2 citation statements)

References 8 publications

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“…According to genetic data, cod spawning groups from the area around Unimak Pass and the Kodiak archipelago are each distinct populations, and the Attu, Amchitka, and Buldir Islands cod are part of the Aleutian Islands population (Cunningham et al, 2009; Spies, 2012). While cod genetics from the northern Kurils are limited, we consider these populations distinctive, because the existing data do not suggest genetic connections to Gulf of Alaska or Aleutian Island stocks (Smirnova et al, 2015). Genetic samples of cod from the Katmai coast (Little Takli and Mink Islands) and Prince of Wales Island have not yet been analyzed (Spies, 2012), so those areas are treated separately.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

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

et al. 2020

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“…Наибольшее освоение выделенных ресурсов вида наблюдается у берегов восточной и юго-западной Камчатки, наимень- В северо-западной части Берингова моря (в пределах акватории Западно-Беринговоморской и Чукотской зон) встречаются преимущественно две группировки трески: местная анадырско-наваринская и восточно-беринговоморская, рыбы которой в летне-осенний период мигрируют из восточной части моря. При этом необходимо отметить обособленность трески анадырско-наваринского района, выявленной на основе анализа генетических и морфобиологических характеристик [4][5][6][7][8]. По одним данным, основу биомассы вида в северо-западной части моря летом составляют половозрелые особи, приходящие на нагул из восточной ее части [9], по другим -рыба анадырско-наваринской и, в период высокой численности, карагинской группировок [10].…”

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Current state of Pacific cod stocks in the northwestern part of the Bering Sea and prospects for its fishery

Datsky,

Antonov,

Savin

2023

Fisheries

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The article presents data on the fishery and stock status of Pacific cod in the northwestern part of the Bering Sea for the period from 1968 to 2024. It is shown that the increase in commercial stocks of this species to an abnormally high level (1.1-1.6 million tons) was due to the warming of water masses in the north of the sea and the formation of an accessible food supply, which contributed to the emergence of several productive generations and determined a high level of fish migration from the eastern parts of the sea. The significant biomass of Pacific cod made it possible to increase its predicted and actual catches to 120.0 and 105.3 thousand tons, respectively. The process of cooling of the Bering Sea waters, which began in 2021, with a simultaneous increase in the area of the cold Laurentian spot, limiting the spread of cod aggregations to the north-west of the sea, the exit of numerous generations of 2011, 2017, 2018 from fishery and the lack of new productive generations led to a decrease in fish stocks and catches to the average long-term level. The ongoing processes in the population dynamics of Pacific cod in the northwestern Bering Sea and the accompanying consequences for the efficiency of its fishery must be taken into account when making specific management decisions regarding resource users of this species.

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Comparisons of genetic population structures of copepods Pseudocalanus spp. in the Okhotsk Sea: the first record of P. acuspes in coastal waters off Japan

Hirai¹,

Katakura²,

Nagai³

2023

Mar. Biodivers.

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Genetic differentiation of Pacific cod Gadus macrocephalus in the Sea of Okhotsk and in the Bering Sea

Cited by 8 publications

References 8 publications

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

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

Current state of Pacific cod stocks in the northwestern part of the Bering Sea and prospects for its fishery

Comparisons of genetic population structures of copepods Pseudocalanus spp. in the Okhotsk Sea: the first record of P. acuspes in coastal waters off Japan

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