Deterring harbour porpoise from gillnets: observed reactions to passive reflectors and pingers

Harbor porpoises (Phocoena phocoena) in British Columbia, Canada avoid experimental gillnet float lines with pingers. Harbor porpoise (Phocoena phocoena) in British Columbia, Canada did not avoid a barrier consisting of passive acoustic deterrents.
Field Studies:

Location	Fishing gear	Reduction technique	Bycatch species	Effect on bycatch species	Catch	Effect on target catch	Type
Canada	Gillnets	Acoustic pingers	Small Cetaceans (maximum length < 7.5 meters)	Harbor porpoise avoid gear	Trout		In the wild
Canada		Passive acoustic deterrents	Small Cetaceans (maximum length < 7.5 meters)	Harbor porpoise did not avoid gear	Trout		In the wild