Dynamics of snow crab (Chionoecetes opilio) movement and migration along the Newfoundland and Labrador and Eastern Barents Sea continental shelves

Mullowney, Darrell; Morris, Corey J.; Dawe, Earl G.; Zagorsky, Ivan; Goryanina, S. V.

doi:10.1007/s11160-017-9513-y

Cited by 26 publications

(32 citation statements)

References 36 publications

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“…Предполагается, что наблюдаемые различия в пространственном распределении размерно-возрастных групп самцов и самок обусловлены, с одной стороны, наличием планктонной личиночной стадии, обеспечивающей разобщенность мест массового выклева личинок и их оседания, с другой -онтогенетическими миграциями крабов с мелководных участков на более глубоководные. Для некоторых районов Северо-Западной Атлантики [Hooper, 1986;Mullowney et al, 2017], а также для восточной части Берингова моря [Nicol, Somerton, 2015] представлены убедительные свидетельства наличия сезонных миграций самцов краба-стригуна опилио, что ещё более усложняет пространственную структуру популяции этого вида.…”

Section: Introductionunclassified

Spatial distribution of the Chionoecetes opilio functional groups in the Barents Sea population during 2013–2017 fishing seasons

Sologub¹,

Alexeyev²,

Goryanina³

2018

Tr VNIRO

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России и открытой части Баренцева моря (ОЧБМ) с помощью промысловых крабовых ловушек. Анализ распределения краба-стригуна опилио выполнен с учетом особенностей аллометрического роста и наличия терминальной линьки. Выявлены участки локализации следующих функциональных групп баренцевоморской популяции краба-стригуна опилио: узкопалых и широкопалых самцов, а также половозрелых и неполовозрелых самок. Исходя из особенностей распределения указанных функциональных групп, показано наличие в пределах ИЭЗ России в Баренцевом море всех основных структурных элементов популяции: нагульной зоны (с дифференциацией в её пределах питомной области, области нагула узкопалых самцов и области нагула широкопалых самцов), репродуктивной зоны, зоны нестерильного выселения и зоны стерильного выселения. Большая часть акватории ОЧБМ является периферийной зоной популяции краба-стригуна опилио, и только небольшой участок охватывает зону нагула терминальных самцов. Результаты выполненных исследований показывают, что основные элементы пространственно-функциональной структуры ареала сформировавшейся в Баренцевом море популяции краба-стригуна опилио располагаются в пределах континентального шельфа России в Баренцевом море. За его пределы выходит только западная периферия ареала, которая, по-видимому, относится к нестерильной и стерильной зонам выселения. Ключевые слова: краб-стригун опилио, Баренцево море, пространственно-функциональная структура популяции, терминальная линька, промысел.

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Section: Introductionunclassified

Spatial distribution of the Chionoecetes opilio functional groups in the Barents Sea population during 2013–2017 fishing seasons

Sologub¹,

Alexeyev²,

Goryanina³

2018

Tr VNIRO

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“…Sexual size dimorphism enables a male-only harvest strategy, therefore molting dynamics of large males are of most interest to the fishery. The regulated minimum legalsize of 95-mm carapace width (CW) for males is much larger than maximum sizes typically reached by females (Mullowney et al, 2018a.…”

Section: Biology Of Soft-shell Crabmentioning

confidence: 97%

“…Newfoundland and Labrador (NL) snow crab (Chionoecetes opilio) molt over-winter or during spring, with spatiotemporal molting dynamics associated with movement and mating patterns (Mullowney et al, 2018a). Sexual size dimorphism enables a male-only harvest strategy, therefore molting dynamics of large males are of most interest to the fishery.…”

Section: Biology Of Soft-shell Crabmentioning

confidence: 99%

Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

2021

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Capture of recently molted soft-shell crab in the Newfoundland and Labrador (NL) snow crab (Chionoecetes opilio) fishery is undesirable due to resource wastage associated with low meat yield and supposed high mortality rates upon discard. This study is intended to formalize best-practice management advice for avoidance of soft-shell crab in the fishery. The study investigates factors affecting soft-shell incidence in the catch across a large geographic stock range encompassing dynamic habitat and contrasting harvest rate strategies. The results demonstrate an interaction between seasonality and harvest rate in governing soft-shell crab levels in the fishery. Greatest potential for high soft-shell incidence occurs in late-spring or summer (June–July) fisheries in warm water populations subjected to heavy fishing pressure, with warm water populations shown to be associated with earlier molting periods. The study concludes that the optimal time to harvest snow crab is during winter or early spring, and advises that wherever winter or early spring fisheries are not possible, a best-practice management strategy is to minimize wastage by maintaining a strong residual biomass of large hard-shell males in the population at all times. This strategy is easily enabled by consistent application of low exploitation rates.

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“…The snow crab C. opilio is a stenothermal brachyuran species broadly distributed in the northern Pacific and northern Atlantic Oceans, but in the Pechora Sea, it is an alien invasive species (Alvsvåg et al 2009;Sokolov et al 2016;Mullowney et al 2018;Zalota et al 2018). C. opilio was first recorded in fisheries bycatch in the Barents Sea near Gusinaya Banka in 1996, thereafter forming a self-maintained population; however, it was not deliberately introduced to the area (Jørgensen and Spiridonov 2013;Sokolov et al 2016;Mullowney et al 2018). It is a boreal Arctic coldwater species, typically inhabiting muddy sand grounds in waters 150-250 m deep in the Barents Sea (Bakanev et al 2016).…”

Section: Distribution and Diets Of C Opilio H Araneus And P Pubesmentioning

confidence: 99%

Trophic niches of benthic crustaceans in the Pechora Sea suggest that the invasive snow crab Chionoecetes opilio could be an important competitor

et al. 2020

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Expanding human activities alongside climate change, the introduction of invasive species and water contamination pose multiple threats to the unique marine ecosystems of the Pechora Sea in the Russian Arctic. Baseline data on biodiversity and responses to environmental change are urgently needed. Benthic decapod crustaceans are globally distributed and play an important role in fisheries, yet their roles in food webs are less understood. In this study, we used an integrated approach combining stomach content analysis and stable isotope analyses (δ13C and δ15N) to examine the trophic niches of three decapod species in the Pechora Sea including the invasive snow crab Chionoecetes opilio and two species of native decapods, the spider crab Hyas araneus and the hermit crab Pagurus pubescens. Stomach contents of 75 decapods were analysed (C. opilion = 23; H. araneusn = 9; P. pubescensn = 43), and 20 categories of prey items were identified with the most frequently occurring prey items being bivalve molluscs (Ciliatocardium ciliatum, Ennucula tenuis, Macoma calcarea), polychaetes, crustaceans and plant debris. Bayesian ellipse analyses of stable isotope signatures (n = 40) revealed that C. opilio displays an overlapping trophic niche with the two native decapods, providing direct evidence that the invader likely competes for food resources with both H. araneus and P. pubescens. As such, the presence of this invasive species could hold important consequences for trophic interactions, benthic ecosystem functioning and biodiversity. Microplastics were also found to be a likely stressor on this ecosystem, as 28% of all stomachs contained digested microplastics among other items. Long-term studies of benthic ecosystem structure and functioning are now needed to more fully understand the extent to which this new competitor may alter the future biodiversity of the Pechora Sea alongside the additional stressor of digested plastics.

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Dynamics of snow crab (Chionoecetes opilio) movement and migration along the Newfoundland and Labrador and Eastern Barents Sea continental shelves

Cited by 26 publications

References 36 publications

Spatial distribution of the Chionoecetes opilio functional groups in the Barents Sea population during 2013–2017 fishing seasons

Spatial distribution of the Chionoecetes opilio functional groups in the Barents Sea population during 2013–2017 fishing seasons

Hard to Manage? Dynamics of Soft-Shell Crab in the Newfoundland and Labrador Snow Crab Fishery

Trophic niches of benthic crustaceans in the Pechora Sea suggest that the invasive snow crab Chionoecetes opilio could be an important competitor

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