Understanding and addressing seabird bycatch in Alaska demersal longline fisheries

Dietrich, Kimberly S.; Parrish, Julia K.; Melvin, Edward F.

doi:10.1016/j.biocon.2009.06.013

Cited by 30 publications

(36 citation statements)

References 54 publications

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“…Péron et al 2010), in the absence of trawling activity (moratoria, weekends and calendar holidays). It is worth noticing that in our case the number of hooks per set was unimportant as an explanatory variable, although it has been suggested as a predictor variable (Dietrich et al 2009) and is widely used as a measure of fishing effort (Belda & Sánchez 2001, Bugoni et al 2008a. This is in agreement with Véran et al (2007), who suggested that the relationship between number of hooks per set and fish caught is not always straightforward (but see Báez et al 2007).…”

Section: Modelling Bycatch In the Western Mediterraneansupporting

confidence: 78%

“…When trawling discards were not available, Cory's shearwaters were presumably more attracted to the bottom longline fishery, searching for alternative opportunistic food (Oro & Ruiz 1997). According to ZIP models, trawling regime, fishing time and breeding stage were key factors 247 It is worth noticing that in our case the number of hooks per set was unimportant as an explanatory variable, although it has been suggested as a predictor variable (Dietrich et al 2009) and is widely used as a measure of fishing effort (Belda & Sánchez 2001, Bugoni et al 2008a. This is in agreement with Véran et al (2007), who suggested that the relationship between number of hooks per set and fish caught is not always straightforward (but see Báez et al 2007).…”

mentioning

confidence: 84%

“…Fishing time is already known to increase bycatch when longlines are set during sunrise (Belda & Sánchez 2001, Sánchez & Belda 2003. The number of hooks was used as an indicator of fishing effort since (1) it is used as a predictor of seabird bycatch (Bugoni et al 2008a, Dietrich et al 2009) and (2) it is extensively used as a measure of fishing effort (Belda & Sánchez 2001, Bugoni et al 2008b). In addition, we also considered the breeding cycle of the species, since 242 Laneri et al: Seabird bycatch in small-scale Mediterranean fisheries energetic requirements may change over the breeding period, from the pre-breeding to the chick-rearing period (Navarro et al 2007).…”

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confidence: 99%

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Trawling regime influences longline seabird bycatch in the Mediterranean: new insights from a small-scale fishery

Laneri¹,

Louzao²,

Martínez‐Abraín³

et al. 2010

Mar. Ecol. Prog. Ser.

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Unintended mortality in longlines emerged in the early 1990s as one of the most important threats for pelagic seabirds worldwide. Most of the studies were focused on highly developed industrial fisheries, overlooking bycatch in small-scale artisanal fisheries. However, bycatch in smallscale fisheries might have negative effects similar to those of industrial fisheries when they overlap with hotspot areas of top predators. Moreover, different types of fishing gear coexist in the same oceanographic area, particularly in highly exploited marine ecosystems such as the western Mediterranean. We quantify for the first time the influence of trawling regime on Cory's shearwater Calonectris diomedea bycatch in the western Mediterranean longline artisanal fishery. The availability of trawling discards has substantial influence on the foraging and breeding ecology of many seabirds, and trawling inactivity may drive shearwaters to seek alternative food resources, such as baits used in longline fishing. Based on our previous knowledge of the system, we also tested other variables affecting bycatch over 8 yr (1998 to 2005). Within this 2-fishery framework, we found that trawling regime, longline fishing time and breeding stage were key factors explaining shearwater attendance to longline vessels, but mainly trawling regime and fishing time increased the incidental capture of Cory's shearwaters. More specifically, during the pre-breeding and chick-rearing periods, bycatch dramatically increased during sunrise sets in the absence of trawling activity. Importantly, this study indicates the need for an integrated multi-fisheries management approach for the conservation of seabirds and highlights the necessity of banning longline fishing during periods of trawling inactivity.KEY WORDS: Small-scale fishery · Interactions between fisheries · Multi-fisheries management · Trawling inactivity · Cory's shearwater · Mitigation measures · Western Mediterranean Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 420: [241][242][243][244][245][246][247][248][249][250][251][252] 2010 for an 80% reduction in community biomass, affecting both target and non-target species (Myers & Worm 2003, Lewison et al. 2004b). For instance, many thousands of seabirds (mostly Procellariiformes) are killed annually by longline fisheries, and consequently populations have shown important declines in abundance over the last 3 to 4 decades (Weimerskirch & Jouventin 1987, Gales et al. 1998, Brothers et al. 1999, Nel et al. 2002, Cooper et al. 2003. In fact, one-third of the seabird species accidentally caught are catalogued as globally threatened according to the International Union for Conservation of Nature (IUCN) criteria (Brothers et al. 1999, BirdLife International 2004.Most studies reporting top predator bycatch have been performed on highly developed industrial fisheries, and it has seldom been considered in small-scale artisanal fisheries (but see D'Agrosa et al. 2000, Peckham et al. 2007, Bugoni e...

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Section: Modelling Bycatch In the Western Mediterraneansupporting

confidence: 78%

mentioning

confidence: 84%

mentioning

confidence: 99%

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Trawling regime influences longline seabird bycatch in the Mediterranean: new insights from a small-scale fishery

Laneri¹,

Louzao²,

Martínez‐Abraín³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…Spatio-temporal overlap between seabirds and fisheries is a necessary precondition for bycatch; however, it is not necessarily a good predictor of bycatch at the local (i.e., boat) scale. Factors including individual vessel effects (Dietrich, 2003), time of day (Nel et al, 2002b) or weather conditions (Brothers et al, 1999a) may modulate interaction rates between seabirds and fishery gear. However, at relatively larger scales (e.g., years or regions) and specifically in our study system, annual seabird abundance in the SJDF has been shown to fluctuate in parallel with bycatch rates (Melvin et al, 1999;Melvin et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Linking colonies to fisheries: Spatio-temporal overlap between common murres (Uria aalge) from Tatoosh Island and coastal gillnet fisheries in the Pacific Northwest, USA

Hamel

Parrish

Laake

2008

Biological Conservation

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“…Two other well-studied examples of bycatch affecting threatened, endangered, or protected species are turtles caught in a variety of fishing gears (Hall et al 2000;Lewison et al 2004) and seabirds caught by longlines (Melvin et al 2004;Dietrich et al 2009). In both cases the bycatch caused major reductions in population abundance, potentially leading to extinction, and in both cases technical measures were taken to dramatically reduce bycatch mortality.…”

Section: Bycatch and Ecosystem Impacts Of Fishing Gearmentioning

confidence: 99%

When is a fishery sustainable?

Hilborn

Fulton

Green

et al. 2015

Can. J. Fish. Aquat. Sci.

111

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Despite the many scientific and public discussions on the sustainability of fisheries, there are still great differences in both perception and definition of the concept. Most authors now suggest that sustainability is best defined as the ability to sustain goods and services to human society, with social and economic factors to be considered along with environmental impacts. The result has been that each group (scientists, economists, non-governmental organizations (NGOs), etc.) defines "sustainable seafood" using whatever criteria it considers most important, and the same fish product may be deemed sustainable by one group and totally unsustainable by another one. We contend, however, that there is now extensive evidence that an ecological focus alone does not guarantee long-term sustainability of any form and that seafood sustainability must consistently take on a socio-ecological perspective if it is to be effective across cultures and in the future. The sustainability of seafood production depends not on the abundance of a fish stock, but on the ability of the fishery management system to adjust fishing pressure to appropriate levels. While there are scientific standards to judge the sustainability of food production, once we examine ecological, social, and economic aspects of sustainability, there is no unique scientific standard.Résumé : Malgré les nombreuses discussions scientifiques et publiques sur la durabilité des pêches, de grandes différences persistent quant à la perception et à la définition de ce concept. La plupart des auteurs suggèrent actuellement que la meilleure définition de la durabilité est la capacité de maintenir des biens et services pour la société humaine, en tenant compte de facteurs sociaux et économiques, ainsi que des impacts sur l'environnement. Il en découle que chaque groupe (scientifiques, écono-mistes, ONG (les organisations nongouvernementales), etc.) définit les « poissons et fruits de mer durables » sur la base des critères qu'il juge les plus importants, et un produit donné peut être jugé durable par un groupe, alors qu'un autre groupe estime qu'il n'est pas du tout durable. Nous soutenons toutefois qu'il existe une vaste preuve à l'effet qu'une seule optique écologique ne garantit aucune forme de durabilité à long terme, et que la durabilité des poissons et fruits de mer doit uniformément reposer sur une perspective socioécologique pour constituer un concept efficace pour l'avenir, peu importe la culture. La durabilité de la production de poissons et fruits de mer dépend non pas de l'abondance d'un stock de poissons, mais de la capacité du système de gestion des pêches à ajuster la pression de pêche aux bons niveaux. S'il existe des normes scientifiques pour juger de la durabilité de la production alimentaire, il n'y a pas de norme scientifique unique pour l'évaluation des aspects écologiques, sociaux et économiques de la durabilité. [Traduit par la Rédaction]

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Understanding and addressing seabird bycatch in Alaska demersal longline fisheries

Cited by 30 publications

References 54 publications

Trawling regime influences longline seabird bycatch in the Mediterranean: new insights from a small-scale fishery

Trawling regime influences longline seabird bycatch in the Mediterranean: new insights from a small-scale fishery

Linking colonies to fisheries: Spatio-temporal overlap between common murres (Uria aalge) from Tatoosh Island and coastal gillnet fisheries in the Pacific Northwest, USA

When is a fishery sustainable?

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