Hawaii Longline Seabird Mortality Mitigation Project.

Dyed bait, alternative offal discards, bird-scaring devices (streamer lines & towed buoys), and night sets reduced seabird (Black-footed (Phobastria nigripes) and Laysan (Phoebastria immutabilis) albatrosses) bycatch in the Hawaiian swordfish and tuna longline fisheries. Alternative offal discards worked by distracting seabirds from hooked bait. Dyed bait did not affect the catch of target and marketable species (all marlin and tuna species, swordfish, shortbill spearfish, opah, wahoo, and dolphinfish), but it reduced catch of blue sharks.
Field Studies:

Location	Fishing gear	Reduction technique	Bycatch species	Effect on bycatch species	Catch	Effect on target catch	Type
Hawaii	Hooks-and-Lines	Dyed bait	Seabirds	Reduced bycatch	Swordfish and tuna	Did not affect target catch	In the wild
Hawaii	Hooks-and-Lines	Alternative offal discharge	Seabirds	Reduced bycatch	Swordfish and tuna		In the wild
Hawaii	Hooks-and-Lines	Bird-scaring devices	Seabirds	Reduced bycatch	Swordfish and tuna		In the wild
Hawaii	Hooks-and-Lines	Night sets	Seabirds	Reduced bycatch	Swordfish and tuna		In the wild