Acoustic pingers

Underwater sound-emitting devices (maximum level of intensity equivalent to approximately 175 dB re 1 &micro;Pa @ 1m) attached to fishing gear, principally gillnets. [Under NOAA's Harbor Porpoise Take Reduction Plan for the Gulf of Maine, the sound output intensity for pingers is stipulated as 10 (&plusmn;2) kHz at 132 (&plusmn;4) dB re 1 &micro;Pa @ 1m (NMFS/NOAA, 1998)]. Pingers are now mandated for use in some fisheries in the U.S. Northwest Atlantic, California driftnet, and in Europe. The sound of these devices is believed to alert an animal to the presence of the net and thus decrease the probability of entanglement. Although some studies have shown that pingers can have the unintended consequence of attracting pinnipeds to fishing operations (Bordino et al., 2002), this may be controllable by raising the emitted frequency of the pingers above seal hearing (Kraus et al., 1997). <br />

Effects of adding sounds to cod traps on the probability of collisions by humpback whales

Study Type: 

wild

Location: 

Canada

Target catch: 

Cod

Effect on bycatch species: 

Decreased collisions

Effect on target catch: 

Increased cod catch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Experimental testing of acoustic alarms (pingers) to reduce bycatch of harbor porpoise, Phocoena phocoena, in the state of Washington

Study Type: 

wild

Location: 

Washington State

Target catch: 

Salmon & sturgeon

Effect on bycatch species: 

Reduced harbor porpoise bycatch

Effect on target catch: 

Did not affect target catch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

A field experiment using acoustic alarms (pingers) to reduce harbour porpoise by-catch in bottom-set gillnets

Study Type: 

wild

Location: 

Sweden

Target catch: 

Cod and pollock

Effect on bycatch species: 

No bycatch in nets with or without pingers

Effect on target catch: 

Did not affect target catch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Analysis and mitigation of cetacean bycatch in UK fisheries

Study Type: 

wild

Location: 

United Kingdom

Target catch: 

Bass

Effect on bycatch species: 

Did not reduce bycatch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 155

Study Type: 

wild

Location: 

Gulf of Maine

Target catch: 

n/a

Effect on bycatch species: 

Gillnets with pingers caught fewer porpoise

Effect on target catch: 

n/a

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Acoustic alarms reduce porpoise mortality

Study Type: 

wild

Location: 

United States

Target catch: 

Multiple species

Effect on bycatch species: 

Reduced harbor porpoise bycatch

Effect on target catch: 

Effect varied by species

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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

Study Type: 

wild

Location: 

Canada

Target catch: 

n/a

Effect on bycatch species: 

92.4% of porpoise groups avoided pinger equipped floatlines

Effect on target catch: 

n/a

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Reactions of harbor porpoises Phocoena phocoena and herring Clupea harengus to acoustic alarms

Study Type: 

wild

Location: 

Canada

Target catch: 

Herring

Effect on bycatch species: 

Harbor porpoise avoided area

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 122

Study Type: 

wild

Location: 

Argentina

Target catch: 

Sea trout, croaker, letherjack, Patagonian smooth hound

Effect on bycatch species: 

Reduced dolphin bycatch

Effect on target catch: 

No effect

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Pages