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Displaying 11 - 20 of 561
Location Gear Catch Technique Bycatch species Type Results

California

Gillnets
Swordfish & Shark
Acoustic deterrent devices
Small Cetaceans (maximum length < 7.5 meters) Field study in the wild
Summary: Pingers reduce bycatch of California sea lions (Zalophus californianus) and short-beaked common dolphins (Delphinus delphis) in the California drift gillnet fishery for swordfish and sharks. Catch of target fish species (broadbill swordfish, common thresher shark, and shortfin mako shark) and non-target species were not affected by pinger use.
Effect on Bycatch: Reduced bycatch
Reference:
Barlow, J. and Cameron, G.A., 2003 , Field Experiments Show That Acoustic Pingers Reduce Marine Mammal Bycatch in the California Drift Gill Net Fishery

Argentina

Gillnets
Sea trout, croaker, letherjack, Patagonian smooth hound
Acoustic deterrent devices
Small Cetaceans (maximum length < 7.5 meters), Pontoporia blainvillei (Franciscana dolphin) Field study in the wild
Summary: Pingers are effective in reducing the bycatch of Franciscana dolphins (Pontoporia blainvillei) but increase interactions between fishing gear and South American sea lions (Otaria byronia) in an Argentinian bottom gillnet fishery.
Effect on Bycatch: Reduced dolphin bycatch
Reference:
Bordino, P., Kraus, S., Albareda, D., Fazio, A., Palmerio, A., Mendez, M. & Botta, S., 2002 , Reducing incidental mortality of Franciscana dolphin Pontoporia blainvillei with acoustic warning devices attached to fishing nets.

Argentina

Gillnets
Sea trout, croaker, letherjack, Patagonian smooth hound
Acoustic deterrent devices
Pinnipeds Field study in the wild
Summary: Pingers are effective in reducing the bycatch of Franciscana dolphins (Pontoporia blainvillei) but increase interactions between fishing gear and South American sea lions (Otaria byronia) in an Argentinian bottom gillnet fishery.
Effect on Bycatch: Increased interactions between gear and sea lions
Reference:
Bordino, P., Kraus, S., Albareda, D., Fazio, A., Palmerio, A., Mendez, M. & Botta, S., 2002 , Reducing incidental mortality of Franciscana dolphin Pontoporia blainvillei with acoustic warning devices attached to fishing nets.

Washington State

Gillnets
Salmon & sturgeon
Acoustic deterrent devices
Pinnipeds Field study in the wild
Summary: Pingers do not reduce bycatch of harbor seals (Phoca vitulina) in the salmon and sturgeon gillnet fisheries in northern Washington state but do reduce bycatch of harbor porpoise (Phocoena phocoena). Pingers did not affect catch of target species, chinook salmon (Oncorhynchus tshawytscha) and sturgeon (Acipenser sp.).
Effect on Bycatch: Did not reduce seal bycatch
Reference:
Gearin, P.J., Gosho, M.E., Laake, J.L., Cooke, L., Delong, R.L. & Hughes, K.M., 2000 , Experimental testing of acoustic alarms (pingers) to reduce bycatch of harbor porpoise, Phocoena phocoena, in the state of Washington

Washington State

Gillnets
Salmon & sturgeon
Acoustic deterrent devices
Phocoena phocoena (Harbor porpoise) Field study in the wild
Summary: Pingers do not reduce bycatch of harbor seals (Phoca vitulina) in the salmon and sturgeon gillnet fisheries in northern Washington state but do reduce bycatch of harbor porpoise (Phocoena phocoena). Pingers did not affect catch of target species, chinook salmon (Oncorhynchus tshawytscha) and sturgeon (Acipenser sp.).
Effect on Bycatch: Reduced harbor porpoise bycatch
Reference:
Gearin, P.J., Gosho, M.E., Laake, J.L., Cooke, L., Delong, R.L. & Hughes, K.M., 2000 , Experimental testing of acoustic alarms (pingers) to reduce bycatch of harbor porpoise, Phocoena phocoena, in the state of Washington

Canada

Gillnets
Herring
Acoustic deterrent devices
Small Cetaceans (maximum length < 7.5 meters), Phocoena phocoena (Harbor porpoise) Field study in the wild
Summary: Harbor porpoise (Phocoena phocoena) avoided an area around a non-lethal, experimental gillnet equipped with a pinger in British Columbia, Canada. In a separate experiment with gillnets in the Baltic Sea, pingers did not affect the catch of targeted herring (Clupea harengus).
Effect on Bycatch: Harbor porpoise avoided area
Reference:
Culik, B.M., Koschinski, S., Tregenza, N. & Ellis, G.M., 2001 , Reactions of harbor porpoises Phocoena phocoena and herring Clupea harengus to acoustic alarms

Canada

Traps
Cod
Acoustic deterrent devices
Megaptera novaeangliae (Humpback whale) Field study in the wild
Summary:

Cod traps equipped with pingers resulted in a reduction in collisions with humpback whales (Megaptera novaeangliae) in Newfoundland, Canada. Traps with alarms caught more fish than traps without alarms.

Effect on Bycatch: Decreased collisions
Reference:
Lien, J., Barney, W., Todd, S., Seton, R. & Guzzwell, J., 1992 , Effects of adding sounds to cod traps on the probability of collisions by humpback whales

New Zealand

Gillnets
n/a
Acoustic deterrent devices
Small Cetaceans (maximum length < 7.5 meters) Field study in the wild
Summary:

Acoustic pingers were tested for their effectiveness to reduce entanglement of Hector's dolphins in New Zealand gillnets. A remote control device was used to raise either active or passive acoustic pingers near Hector's dolphins. The dolphins' movement and distribution was observed from shore.Dolphins avoided the immediate area when pingers were active, but did not leave the larger harbor area. Dolphin sightings made during active pinger trials were distributed significantly farther from the source than during passive trials. 

Effect on Bycatch: Dolphins avoided area
Reference:
Stone, G., Kraus, S., Hutt, A., Martin, S., Yoshinaga, A. & Joy, L., 1997 , Reducing bycatch: can acoustic pingers keep Hector's dolphins out of fishing nets?

Canada

Gillnets
n/a
Acoustic deterrent devices
Small Cetaceans (maximum length < 7.5 meters), Phocoena phocoena (Harbor porpoise) Field study in the wild
Summary:

Three different device types were mounted on floatline to test their potential for reducing harbor porpoise bycatch. The devices were two passive reflectors (target strength ranging from -38 dB to -24 dB) and a 2.9 kHz pinger. Behavioral responses of 355 harbor porpoise groups were monitored. 92.4% of the groups avoided the pinger equipped floatline, while only half the groups avoided the reflectors and control, empty, floatline.  

Effect on Bycatch: 92.4% of porpoise groups avoided pinger equipped floatlines
Reference:
Koschinski, S. & Culik, B., 1997 , Deterring harbour porpoise from gillnets: observed reactions to passive reflectors and pingers

Canada

Gillnets
n/a
Acoustic deterrent devices

Passive acoustic deterrents
Phocoena phocoena (Harbor porpoise) Field study in the wild
Summary:

Three different device types were mounted on floatline to test their potential for reducing harbor porpoise bycatch. The devices were two passive reflectors (target strength ranging from -38 dB to -24 dB) and a 2.9 kHz pinger. Behavioral responses of 355 harbor porpoise groups were monitored. 92.4% of the groups avoided the pinger equipped floatline, while only half the groups avoided the reflectors and control, empty, floatline.  

Effect on Bycatch: Did not significantly reduce interactions with gear
Reference:
Koschinski, S. & Culik, B., 1997 , Deterring harbour porpoise from gillnets: observed reactions to passive reflectors and pingers

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