Underwater observations of the behaviour of snow crab (Chionoecetes opilio) encountering a shrimp trawl off northeast Newfoundland

Nguyen, Truong X.; Winger, Paul D.; Legge, George; Dawe, Earl G.; Mullowney, Darrell

doi:10.1016/j.fishres.2014.04.013

Cited by 15 publications

(13 citation statements)

References 8 publications

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“…With further data the impacts of discarding could be addressed in future studies. The mechanism by which trawling or gillnetting may have led to a decrease in relative production is not known, but Nguyen et al (2014) reported that 54% of snow crabs had a direct encounter with an experimental shrimp trawl. Whether or not such encounters result in increased mortality is unclear, but it is likely that moulting and soft-shelled crabs may be particularly susceptible.…”

Section: Discussionmentioning

confidence: 99%

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Kincaid

Rose

2017

Can. J. Fish. Aquat. Sci.

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Abstract:The Hawke Box is an offshore area (8610 km 2 ) of the boreal Northwest Atlantic that at the request of local fishers was closed to trawling and gillnetting in 2003, but remained open to seasonal snow crab (Chionocetes opilio) pot fishing. Closure was a precautionary management measure primarily to sustain the crab fishery and secondarily to conserve cod known to aggregate there. Fall (1996Fall ( -2013Fall ( ) and spring (1996Fall ( -2003Fall ( , 2015 surveys indicated that biological community assemblages changed significantly before-after and inside-outside the closure (PERMANOVA P < 0.01). Crab fishery data (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) indicated that landings and relative production declined throughout the region after closure, but was significantly more outside than inside. Atlantic cod (Gadus morhua) increased inside and outside the closure, and several other demersal species increased significantly more inside. The Hawke Box provides a unique boreal area for the study of restrictions on trawling and gillnetting in an area with historically strong fisheries, restrictions that are strongly supported by local fishers. The overall evidence suggests that within a decade the Hawke Box has benefited fisheries communities, fisheries production, and biodiversity conservation.Résumé : La Hawke Box est une zone extracôtière (8610 km 2 ) de l'Atlantique Nord-Ouest boréal qui, à la demande de pêcheurs locaux, a été fermée à la pêche au chalut et au filet maillant en 2003, mais est demeurée ouverte à la pêche au casier saisonnière au crabe des neiges (Chionoecetes opilio). La fermeture constituait une mesure de gestion préventive visant en premier lieu à soutenir la pêche au crabe et, en deuxième lieu, à conserver les morues qui se regroupent dans cette zone. Des évaluations automnales (1996-2013) et printanières (1996-2003, 2015) indiquent que les assemblages de la communauté biologique ont changé de manière significative après la fermeture et diffèrent selon qu'ils sont à l'intérieur ou à l'extérieur de la zone visée par la fermeture (P de l'analyse PERMANOVA < 0,01). Des données sur la pêche au crabe (1996-2013) indiquent que les débarquements et la production relative ont baissé dans toute la région après la fermeture, mais significativement plus à l'extérieur qu'à l'intérieur de la zone de fermeture. L'abondance de la morue (Gadus morhua) a augmenté tant à l'intérieur qu'à l'extérieur de la zone, et celle de plusieurs autres espèces démersales a augmenté significativement plus à l'intérieur de la zone. La Hawke Box constitue une zone boréale unique pour l'étude des restrictions sur la pêche au chalut et au filet maillant dans une région caractérisée par des pêches traditionnellement fortes, restrictions fortement soutenues par les pêcheurs locaux. Dans l'ensemble, les données probantes portent à croire que, en une décennie, la Hawke Box a été bénéfique pour les collectivités de pêcheurs, la production des pêches et la conservat...

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Section: Discussionmentioning

confidence: 99%

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Kincaid

Rose

2017

Can. J. Fish. Aquat. Sci.

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“…The impact of trawl methods on non-target fishery stocks is another consideration, with implications for management. In Newfoundland and Labrador, Canada, Nguyen et al (2014) relied on net cameras to reveal the behavioral responses of commercially important snow crabs (Chionoecetes opilio) when encountering shrimp trawl fishing gear; this evidence helps to explain how the gear could be modified to mitigate future impacts.…”

Section: Fish Stocks and Managementmentioning

confidence: 99%

Camera technology for monitoring marine biodiversity and human impact

Bicknell

Godley

Sheehan

et al. 2016

Frontiers in Ecol & Environ

129

106

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Human activities have fundamentally altered the marine environment, creating a need for effective management in one of Earth's most challenging habitats. Remote camera imagery has emerged as an essential tool for monitoring at all scales, from individuals to populations and communities up to entire marine ecosystems. Here we review the use of remote cameras to monitor the marine environment in relation to human activity, and consider emerging and potential future applications. Rapid technological advances in equipment and analytical tools influence where, why, and how remote camera imagery can be applied. We encourage the inclusion of cameras within multi‐method and multi‐sensor approaches to improve our understanding of ecosystems and help manage human activities and minimize impacts.

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“…Industry stakeholders are concerned about the situation and suspect multiple contributing factors, including poor recruitment, changing environmental conditions, increased predation, and interaction with the mobile trawling sector that targets northern shrimp. Recent underwater video camera observations of snow crab encountering the traditional footgear (i.e., rockhopper) of a shrimp trawl demonstrated that snow crab are quickly overtaken by the trawl, with approximately 54% of individuals observed experiencing an encounter with the footgear (Nguyen et al 2014). Rose et al (2013) demonstrated that the mortality of decapod crabs in response to such encounters with trawl footgear can range from 10% to 31% depending on the species and region of the footgear they encounter.…”

Section: Introductionmentioning

confidence: 99%

Comparative fishing to evaluate the viability of an aligned footgear designed to reduce seabed contact in northern shrimp bottom trawl fisheries

Winger

Munden

Nguyen

et al. 2018

Can. J. Fish. Aquat. Sci.

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Abstract:We developed and evaluated an innovative trawl technology that reduces seabed contact while targeting northern shrimp (Pandalus borealis) off the east coast of Canada. The innovative footgear, referred to as the "aligned footgear", was evaluated in a flume tank to estimate contact area with the seabed and then tested at sea for engineering performance and catchability. Results demonstrated that the aligned footgear trawl produced a substantial reduction (i.e., 61%) in the predicted contact area with the seabed compared with the identical trawl equipped with traditional rockhopper footgear. A total of 20 paired tows (n = 40 tows) were subsequently conducted at sea to evaluate fishing performance. The aligned footgear trawl caught significantly more northern shrimp (+23%), capelin (Mallotus villosus) (+71%), and Greenland halibut (Reinhardtius hippoglossoides) (+99%) compared with the traditional rockhopper bottom trawl.Résumé : Nous avons mis au point et évalué une technique novatrice de pêche au chalut qui réduit le contact avec le fond marin en ciblant la crevette nordique (Pandalus borealis) au large de la côte est du Canada. Le bourrelet novateur, appelé « bourrelet aligné », a été évalué dans un bassin à circulation d'eau afin d'estimer l'aire de contact avec le fond marin, puis a fait l'objet d'essais en mer pour évaluer la performance technique et la capturabilité. Les résultats démontrent que le chalut à bourrelet aligné entraîne une réduction importante (c.-à -d. 61 %) de l'aire de contact prévue avec le fond marin par rapport au même chalut équipé d'un bourrelet sauteur classique. Un total de 20 traits appariés (n = 40 traits) ont ensuite été effectués en mer afin d'évaluer la performance de pêche. Le chalut à bourrelet aligné a pris des quantités significativement plus grandes de crevettes nordiques (+23 %), capelans (Mallotus villosus) (+71 %) et flétans noirs (Reinhardtius hippoglossoides) (+99 %) que le chalut de fond à bourrelet sauteur classique. [Traduit par la Rédaction]

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Underwater observations of the behaviour of snow crab (Chionoecetes opilio) encountering a shrimp trawl off northeast Newfoundland

Cited by 15 publications

References 8 publications

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Effects of closing bottom trawling on fisheries, biodiversity, and fishing communities in a boreal marine ecosystem: the Hawke Box off Labrador, Canada

Camera technology for monitoring marine biodiversity and human impact

Comparative fishing to evaluate the viability of an aligned footgear designed to reduce seabed contact in northern shrimp bottom trawl fisheries

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