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MeetingTargeting bigger schools can reduce ecosystem impacts offisheries 2013
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No results found.Sustaibility of living resource exploitation relies on an ecosystem magement approach. Within tropical tu purse seine fisheries using fish aggregating devices (FADs), such an approach incorporates the reduction of bycatch, in par- ticular vulnerable species such as elasmobranchs. The levels of total bycatch (in mass) from fishing operations using FADs is known to be five times higher than when tu are caught in free-swimming schools. We intend to find practical solutions to reduce bycatch in FAD sets through the investigation of the relationships between the ratio of bycatch to target catch across different set size classes in all oceans. Ratios were always highest when catches were small, with the smallest class of catches responsible for the highest total portion of bycatch (23%–43%) while only contributing negligibly to the total tar- get catch (3%–10%). Reducing the number of fishing sets (a part of the total effort) while maintaining the same total yield could contribute to a subst antial reduction in the impacts of human activities. -
Meetingpreliminary information on a new ec project to propose measures to mitigate adverse impacts of open ocean fisheries targeting large pelagic fish. 2008
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DocumentA critique of the ecosystem impacts of drifting and anchored FADs use by purse-seine tuna fisheries in the Westernand Central Pacific Ocean 2013
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No results found.In the Western and Central Pacific Ocean (WCPO), which accounts for over half of world tu production, purse seine effort and catch on floating objects have increased significantly due to a rapid increase in the use of fixed and free-floating fish aggregation devices (FADs). FAD fishing has had an impact on the current status of the stocks of the three main target tus in the equatorial WCPO, skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares) and bigeye (T. obesus). FADs have been shown to influence the behaviour and movement patterns of the three tu species with the juveniles of each species occupying shallower habitats when associated with FADs. Aggregation of tus around drifting objects increases their vulnerability to purse seine gear, particularly for juvenile and small size classes. Further to the impacts on the target stocks, the use of FADs has increased the vulnerability of other fishes to the purse seine method, including some shark and billfish species. Given the con cern over FAD-related fishing effort on target and bycatch species, there is a need to understand how FAD use affects target and bycatch stocks. Science needs to better support magement decisions are highlighted including the need to identify the magnitude of broader community-level affects.
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