Change in water circulation and its implication for distribution and abundance of salmons in the western Bering Sea in the early 21 century (original) (raw)
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Some results of researches on pacific herring in the northwestern Bering Sea in 2010-2015
Izvestiya TINRO
The data of pelagic and bottom surveys on pacific herring in the northwestern Bering Sea obtained in 2010-2015 and its stock assessments by different methods are compared. Some biological parameters of the herring are presented and its spatial distribution and migrations are described. The pelagic surveys with stepped trawling and the bottom trawl surveys are concluded as the best for the herring stock assessment and biological characteristic. The stock state in the 2010-2015 is determined as high abundant due to mass migration of herring from the eastern Bering Sea to its northwestern part that starts in June under certain oceanographic conditions. Different modes of the herring feeding migration are revealed for periods of its high and low stock. The results are used for the herring fishery regulation in the northwestern Bering Sea.
Current state of the atlantic salmon fishing in the lower reaches of the Northern Dvina River
Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences
The aim of the research was to assess the current state of the salmon fishery in the lower reaches of the Northern Dvina River. The material of the research is based on the data of the territorial departments of the Federal Agency for Fishery, regional authorities, and the commission for regulating the production (catch) of anadromous fish species. At present, the importance of salmon fishing as an important source of the population’s well-being has decreased. The contribution to the regional economy has also decreased. Average annual catch of Atlantic salmon in the fishery was 4.3 tons in 2010-2021. In 2020-2022 the fishing areas of second stage were formed and the fishing areas for the remaining fishermen become more concentrate. The reduction of fishing areas has led to a decrease in the number of used fishing gear and salmon catches. At the same time, the catch per effort decreased slightly, and the development of salmon catch volumes remains at a high level, which indicates a d...
Cod distribution in the Barents Sea under climate changes
Trudy VNIRO
The aim of the paper is to assess the impact of climate changes and oceanographic conditions on the distribution of cod stocks in the Barents Sea in recent decades. The material for the study was oceanographic data obtained during surveys in the Barents Sea by PINRO and other available information on hydrometeorological conditions of the sea in 1981–2021, as well as data onRussian catches of cod in the Barents Sea based on bottom trawl fishing operations. Methods of descriptive statistics as well as comparative, correlation and regression analyses were applied. Results: The modern changes in the climate and oceanographic conditions of the Barents Sea are described. Since the early 1980s, the warming has been observed against the background of increasing storm activity, having peaked in 2016. After that, despite still warm and low-ice conditions, there has been a cooling trend in the Barents Sea. Under climate changes in recent decades, cod made increasingly long migrations ...
Fisheries, 2020
This paper describes variations in the abundance of Atlantic salmon in the Ura River from 1958 to 2019. In 1993 and 1998, a decrease in the number of spawners with respect to the conservation limit was observed. Positive trends in the abundance of parr has been observed since 2002, which indicates an unsteady increase in the number of spawners to the precautionary biological limit. Illegal fishery and spreading of salmon diseases are considered to pose threats to the stock status of Atlantic salmon.
The researches of the aquatic biological resources of Kamchatka and of the north-west part of the Pacific Ocean
Исследована динамика запасов нерки, горбуши, кеты и кижуча рек Налычева, Островная и Вахиль за последние 37 лет. Проанализированы биологические характеристики производителей, заходящих на нерест в р. Налычева (включая чавычу) и выполнено их сравнение с впервые полученными в 2017 г. аналогичными данными для р. Островной. Для всех видов лососей (кроме чавычи), обитающих в р. Налычева, выделены темпоральные группировки и показаны, где имеются, биологические различия. Выполнена оценка пространственно-временного разнообразия лососей в каждой из трех рек и сделан вывод о необходимости принятия мер по охране лососевых ресурсов рек Налычева и Островная.
SUBSISTENCE STRATEGIES IN THE STONE AGE, DIRECT AND INDIRECT EVIDENCE OF FISHING AND GATHERING, 2018
Организация конференции и издание материалов осуществлены при финансовой поддержке РФФИ, проект № 18-09-20015 г УДК 902/904 ББК 63.4 С 833 Стратегии жизнеобеспечения в каменном веке, прямые и косвенные свидетельства рыболовства и собирательства. Материалы международной конференции, посвященной 50-летию В.М. Лозовского. Под редакцией О.В. Лозовской, А.А. Выборнова и Е.В. Долбуновой.-СПб.: ИИМК РАН, 2018.-266 с. Сборник содержит материалы международной конференции, приуроченной к 50-летию яркого исследователя позднего каменного века Восточной Европы В.М. Лозовского. Представленные работы объединены проблематикой изучения взаимодействия человека и окружающей среды и разным моделям адаптации в рамках первобытного хозяйства. Основное внимание уделяется роли рыбной ловли и собирательства съедобных растений, важнейших видов деятельности, однако недостаточно освещенных в археологических источниках. Материалы поздних поселений с благоприятными условиями сохранности органических материалов, а также косвенные свидетельства производства и использования рыболовных инструментов и орудий собирательства, горелые макроостатки семян и растений, данные химического состава содержимого посуды и изотопные характеристики человеческих костей, должны помочь реально оценить роль этих видов пищевых ресурсов в диете первобытного человека. Издание предназначено для археологов, палеогеографов, палеоботаников и представителей смежных дисциплин.
Izvestiya TINRO
Seasonal and interannual variability of zooplankton in the area at Cape Navarin are considered on the base of long-term surveys. This area is the main fishing grounds for Russian pollock fishery in the Bering Sea. Species composition of zooplankton changes cardinally during the feeding period: large-size copepods prevail in summer, but euphausiids, mainly the krill Thysanoessa inermis - in autumn. Year-to-year changes of the zooplankton abundance are species-specific and driven by different environmental factors. The water circulation is crucially important for such allochtonous species as krill by transporting them from the spawning areas. Advection either from the south, i.e. from the continental slope (till 2006), or from the east and west, i.e. from the shelf (in 2007-2014), was observed in the last two decades that corresponded to replacing of relatively warm oceanographic regime by relatively cold regime and could be traced by dynamics of the ice cover and the cold water pool ...
Izvestiya TINRO, 2016
Abundance and biomass of walleye pollock Theragra chalcogramma in the Bering Sea exceeded the mean values in 2015 owing to the high-abundant year-classes of 2008 and 2012 and several medium-abundant year-classes (of 2006, 2009-2011, 2013, and 2014). In contrast to rather stable distribution on its spawning grounds, distribution of feeding pollock in the northern Bering Sea is very variable and depends on both biomass of the population and long-term and short-term variations of environments, as water temperature and zooplankton abundance. In some years including recent times (2005-2007 and 2010-2014), the pollock migrated earlier and faster into the northwestern Bering Sea and returned back to the eastern shelf also early: in late summer - early autumn. This scenario is supposedly conditioned by low zooplankton abundance over the Bering Sea that forces pollock to active feeding migrations, particularly a deficit of preferable food (large-sized zooplankton) on the north-western feedin...
Fisheries
Salmon fishing in the lower reaches of the Northern Dvina River is based on the use of the spawning part of the Atlantic salmon population. Fisheries regulation measures are developed using knowledge of the biology of the species. Thus, the aim of the research is a comprehensive understanding of the biology of the spawning part of the salmon population in the Northern Dvina River basin based on the generalization of materials from commercial catches for the period 1931-2014. After feeding in the northeastern part of the Atlantic Ocean, adult salmon return to spawn at the age of 5+. The reproductive part of salmon populations is dominated by females. The average size and weight indicators of salmon making spawning migrations are 77,42 cm and 5,43 kg. It has been established that in the last decade of observations, the size and weight characteristics of the reproductive part of the Atlantic salmon populations in the Severodvinsk basin have stabilized. This allows us to conclude that t...