Performance Assessment of Underwater Setting Chutes, Side-Setting, and Blue-Dyed Bait to Minimize Seabird Mortality in Hawaii Pelagic Longline Tuna and Swordfish Fisheries

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Citation: Gilman, E., N. Brothers, and D. Kobayashi, 2003. Performance Assessment of Underwater Setting Chutes, Side-Setting, and Blue-Dyed Bait to Minimize Seabird Mortality in Hawaii Pelagic Longline Tuna and Swordfish Fisheries. Final Report. U.S. Western Pacific Regional Fishery Management Council, Honolulu.
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Link: http://www.wpcouncil.org/protected/Documents/SettingChuteFinalReportNo2.pdf
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Summary:

Underwater setting chutes, blue-dyed bait, and side-sets each reduced the bycatch of seabirds (Laysan and black-footed albatross and short-tailed shearwater) in the Hawaiian longline tuna and swordfish fisheries. Side-sets showed the most promise for a bycatch mitigation technique while blue-dyed bait was the least effective at reducing seabird bycatch and shows the least promise of these methods as an effective bycatch mitigation strategy.
Field Studies:
Location Fishing gear Reduction technique Bycatch species Effect on bycatch species Catch Effect on target catch Type
Hawaii Hooks-and-Lines Sub-surface sets Seabirds Reduced bycatch Swordfish and tuna In the wild
Hawaii Hooks-and-Lines Dyed bait Seabirds Reduced bycatch but least effective of 3 tested techniques Swordfish and tuna In the wild
Hawaii Hooks-and-Lines Side sets Seabirds Reduced bycatch; most promising of 3 tested techniques Swordfish and tuna In the wild