Shark interactions in pelagic longline fisheries
By Eric Gilman, S. Clarke, J. Alfaro‐Shigueto, J. Mandelman, Jeffrey C. Mangel, S. Petersen, S. Piovano, Nic Thomson, P. Dalzell, Miguel Donoso and 2 more. 2008
281 citations recorded by the source corpus.
Substantial ecological, economic and social problems result from shark interactions in pelagic longline fisheries. Improved understanding of industry attitudes and practices towards shark interactions assists with managing these problems. Information on fisher knowledge and new strategies for shark avoidance may benefit sharks and fishers. A study of 12 pelagic longline fisheries from eight countries shows that incentives to avoid sharks vary along a continuum, based on whether sharks represent an economic disadvantage or advantage. Shark avoidance practices are limited, including avoiding certain areas, moving when shark interaction rates are high, using fish instead of squid for bait and deeper setting. Some conventionally employed fishing gear and methods used to target non-shark species contribute to shark avoidance. Shark repellents hold promise; more research and development is needed. Development of specifically designed equipment to discard sharks could improve shark post release survival prospects, reduce gear loss and improve crew safety. With expanding exploitation of sharks for fins and meat, improved data collection, monitoring and precautionary shark management measures are needed to ensure that shark fishing mortality levels are sustainable.
Subfields: Global and Planetary Change, Nature and Landscape Conservation
View Paper: https://www.semanticscholar.org/paper/2ec0b0b42a5484389b46c66f63222e9a6e71c4f3
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In Global and Planetary Change
In Nature and Landscape Conservation
Citations in the corpus
- The role of learning in shark behaviour (2009, background): “A substantial number of sharks survive contact with fishing gear (Gilman et al. 2008) and many long-line fishermen have reported stolen baits or half-eaten target species (Rosa and Secchi 2007) creating the potential for learning.”
- Shark bycatch and depredation in the U.S. Atlantic pelagic longline fishery (2008, methodology): “…report by Gilman et al. (2007b): Shark Depredation and Unwanted Bycatch in Pelagic Longline Fisheries (http://www. wpcouncil.org/pelagic/Documents/Shark-Longline_Interactions_ Report.pdf as of December 17, 2007); and the truncated version of that report published by Gilman et al. (2007a).”
- Is it good or bad to fish with FADs? What are the real impacts of the use of drifting FADs on pelagic marine ecosystems? (2013, background): “…but sharks correspond up to a quarter of total catches (Gilman 2011), even in fisheries which do not target sharks (some longline fisheries actually target blue sharks, Prionace glauca , Car-charhinidae, which is thought to be more resilient to fishing than other shark species – Gilman et al. 2008).”
- Large-scale experiment shows that nylon leaders reduce shark bycatch and benefit pelagic longline fishers (2008, background): “Gilman et al. 2008) report that some fishers avoid using certain types of ait in order to reduce shark interactions, e.g., Italian and apanese fishers avoid using squid.”
- Social behaviour in sharks and rays: analysis, patterns and implications for conservation (2012, background): “In fisheries where sharks are not the principal target species, such as pelagic longline fisheries (for tunas and billfish), the tendency for pelagic shark species to school can increase elasmobranch bycatch, further inflating mortality rates (Gilman et al. 2008).”
- Sea turtle by‐catch in the Mediterranean (2011, background): “2006) and sharks (Gilman et al. 2007) would benefit from deep longline setting.”
- The importance of pelagic longline fishery discards for a seabird community determined through stable isotope analysis (2010, background): “Shark livers discarded in other fisheries around the world are also expected to provide food for albatrosses, petrels and shearwaters, except in fisheries where only shark finning occurs such as in Pacific Ocean waters (Gilman et al., 2008).”
- Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery (2010, background): “While sharks are considered bycatch and their capture undesirable in several fisheries around the world (Gilman et al., 2008; Ward et al., 2008), they are target species and frequently comprise the bulk of captures in the Brazilian pelagic longline fishery (Hazin et al.”