Distribution and abundance of walleye pollock &lt;i&gt;Theragra chalcogramma&lt;/i&gt; in the northwestern Bering Sea in the summer-fall period of 2020 and their interannual variability

Polyanichko, V. I.; Kuznetsov, M. Yu.

doi:10.26428/1606-9919-2022-202-793-809

Izv. Tihookean. naučno-issled. rybohoz. centra

2022

DOI: 10.26428/1606-9919-2022-202-793-809

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Distribution and abundance of walleye pollock <i>Theragra chalcogramma</i> in the northwestern Bering Sea in the summer-fall period of 2020 and their interannual variability

V. I. Polyanichko

M. Yu. Kuznetsov

Abstract: Аннотация. На основе данных эхоинтеграционной тралово-акустической съемки рассматриваются особенности пространственного распределения и обилия минтая в северо-западной части Берингова моря в летне-осенний период 2020 г. Карты горизонтального и вертикального распределения скоплений иллюстрируют предпочтительность обитания минтая в районах шельфа с положительной или близкой к нулю температурой вод и усиление концентрации рыб в градиентных зонах. Наиболее плотные агрегации минтая (более 300 тыс. экз./миля 2 ) был… Show more

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2024

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Acoustic observations of walleye pollock (Gadus chalcogrammus) migration across the US-Russia boundary in the northwest Bering Sea

Levine,

De Robertis,

Bassett

et al. 2024

ICES Journal of Marine Science

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The degree to which walleye pollock (Gadus chalcogrammus, hereafter pollock) move between the US and Russian zones of the Bering Sea is a key source of uncertainty for fisheries management. To study transboundary migrations across the US–Russia maritime boundary and explore how climate variability might influence these migrations, four seafloor-mounted echosounder moorings were deployed from July 2019 to August 2020 in the northwestern Bering Sea. The observations indicated that a substantial amount of pollock moves between the US and Russia seasonally, with a period of southeast movement into the US as winter as sea ice forms and northwest movement into Russia in early summer as waters warm. Over the deployment period, 2.3-times more pollock backscatter moved into the US zone in fall and winter than exited the subsequent spring and summer. We hypothesize that the difference in the net movement between regions was driven by pollock moving farther into Russia during the historically warm conditions at the start of deployment period and reduced northwest return migration the following summer when temperatures were relatively cooler. This supports the hypothesis that temperature affects pollock distribution, and that continued warming will lead to a larger proportion of the stock in Russian waters.

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Acoustic observations of walleye pollock (Gadus chalcogrammus) migration across the US-Russia boundary in the northwest Bering Sea

Levine,

De Robertis,

Bassett

et al. 2024

ICES Journal of Marine Science

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Seasonal patterns and interannual variations of atmospheric circulation over the Bering Sea in 1995–2022

Glebova

2024

Izv. Tihookean. naučno-issled. rybohoz. centra

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Mean patterns of atmospheric circulation over the Bering Sea in 4 seasons: winter (January-March), spring (April-June), summer (July-September) and autumn (OctoberDecember) are described using the author’s typification of synoptic situations. Frequency of all 6 types of synoptic situations is calculated and the predominant types are determined, by season. Mean values of the meridional and zonal indices of atmospheric circulation and the number and intensity of cyclones in the Bering Sea area are calculated for each season in the period 1995–2022. Cyclonic activity and direction and intensity of general wind transfer, particularly intensity of winter and summer monsoons, are considered separately for the western and eastern parts of the Bering Sea. Interannual variations of all these parameters are traced. For all seasons, the wind transfer over the entire area is determined by cyclonic activity in the western Bering Sea: the higher activity leads to weaker monsoon in winter (northeasterly) and summer (southwesterly) but strengthening in spring (southeasterly) and autumn (northwesterly). Since the middle 1990s, autumns and winters in the Bering Sea became warmer (with the warmest period in the late 2010s when southeasterlies prevailed in winter), but springs became colder (southeastern wind transfer in early 2000s changed to the northeastern one in late 2010s), with no definite tendency for summer, when the meridional index of atmospheric circulation was rather stable and the zonal index had a negative trend (weakening of westerlies). Trends and cycles of oceanographic conditions in the northwestern Bering Sea generally coincided with the changes in wind transfer in any season.

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Distribution and abundance of walleye pollock <i>Theragra chalcogramma</i> in the northwestern Bering Sea in the summer-fall period of 2020 and their interannual variability

Cited by 2 publications

References 2 publications

Acoustic observations of walleye pollock (Gadus chalcogrammus) migration across the US-Russia boundary in the northwest Bering Sea

Acoustic observations of walleye pollock (Gadus chalcogrammus) migration across the US-Russia boundary in the northwest Bering Sea

Seasonal patterns and interannual variations of atmospheric circulation over the Bering Sea in 1995–2022

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