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Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Study Type
Field study in the wild
Location
Costa Rica
Target catch
Shrimp
Effect on bycatch species
Significantly more elasmobranchs caught in water <100 m. Four species made up 66% of the elasmobranch bycatch.
Effect on target catch
N/A
Bycatch species
Elasmobranchs
Fishing Gear
Trawls

Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Study Type
Field study in the wild
Location
Costa Rica
Target catch
Shrimp
Effect on bycatch species
Significantly more elasmobranchs caught in water <100 m. Four species made up 66% of the elasmobranch bycatch.
Effect on target catch
N/A
Bycatch species
Elasmobranchs
Fishing Gear
Trawls

Effect of acoustic deterrents on the behavior of common dolphins (Delphinus delphis)

Study Type
Field study in the wild
Location
Ireland
Target catch
none
Effect on bycatch species
CETASAVER and Dolphin Deterrent Device resulted in mild responses by dolphins. BIM pingers elicited no response.
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Fishing Gear
Gillnets

Effect of acoustic deterrents on the behavior of common dolphins (Delphinus delphis)

Study Type
Field study in the wild
Location
Ireland
Target catch
none
Effect on bycatch species
CETASAVER and Dolphin Deterrent Device resulted in mild responses by dolphins. BIM pingers elicited no response.
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Fishing Gear
Gillnets

Mitigation of harbor porpoise (Phocoena phocoena) by-catch in the gillnet fishery in the lower Bay of Fundy

Study Type
Field study in the wild
Location
Bay of Fundy
Target catch
Atlantic cod, Atlantic herring, pollock
Effect on bycatch species
There was a 77% reduction in porpoise bycatch when acoustic alarms were used.
Effect on target catch
There was no significant difference in catch rates when alarms were and were not used.
Bycatch species
Phocoena phocoena (Harbor porpoise)
Fishing Gear
Gillnets

Mitigation of harbor porpoise (Phocoena phocoena) by-catch in the gillnet fishery in the lower Bay of Fundy

Study Type
Field study in the wild
Location
Bay of Fundy
Target catch
Atlantic cod, Atlantic herring, pollock
Effect on bycatch species
There was a 77% reduction in porpoise bycatch when acoustic alarms were used.
Effect on target catch
There was no significant difference in catch rates when alarms were and were not used.
Bycatch species
Phocoena phocoena (Harbor porpoise)
Fishing Gear
Gillnets

Trial of acoustic deterrents (porpoise pingers) for prevention of porpoise (Phocoena phocoena) bycatch

Study Type
Summary study
Location
Cornwall
Target catch
Hake
Effect on bycatch species
Only the AIRMAR pinger worked satisfactorily
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Trial of acoustic deterrents (porpoise pingers) for prevention of porpoise (Phocoena phocoena) bycatch

Study Type
Summary study
Location
Cornwall
Target catch
Hake
Effect on bycatch species
Only the AIRMAR pinger worked satisfactorily
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Trial of acoustic deterrents (porpoise pingers) for prevention of porpoise (Phocoena phocoena) bycatch

Study Type
Summary study
Location
Cornwall
Target catch
Hake
Effect on bycatch species
Only the AIRMAR pinger worked satisfactorily
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Final report to the New England Aquarium on pinger displacement trials for Ganges River dolphins Platanista gangetica in the Sundarbans mangrove forest, Bangledesh

Study Type
Field study in the wild
Location
Bangledash
Target catch
N/A
Effect on bycatch species
Subtle differences in dolphin behavior were detected but it remains unclear if pingers would successfully reduce dolphin interactions with gillnets.
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)

Final report to the New England Aquarium on pinger displacement trials for Ganges River dolphins Platanista gangetica in the Sundarbans mangrove forest, Bangledesh

Study Type
Field study in the wild
Location
Bangledash
Target catch
N/A
Effect on bycatch species
Subtle differences in dolphin behavior were detected but it remains unclear if pingers would successfully reduce dolphin interactions with gillnets.
Effect on target catch
N/A
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)

Porpoise rescue methods in the yellowfin purse seine fishery and the importance of Medina panel mesh size

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Porpoises could not get their snout through 1 inch mesh panel.
Effect on target catch
N/A
Bycatch species
Phocoena phocoena (Harbor porpoise)
Reduction technique
Small mesh size
Fishing Gear
Trawls

Porpoise rescue methods in the yellowfin purse seine fishery and the importance of Medina panel mesh size

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Porpoises could not get their snout through 1 inch mesh panel.
Effect on target catch
N/A
Bycatch species
Phocoena phocoena (Harbor porpoise)
Reduction technique
Small mesh size
Fishing Gear
Trawls

Porpoise rescue methods in the yellowfin purse seine fishery and the importance of Medina panel mesh size

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Porpoises could not get their snout through 1 inch mesh panel.
Effect on target catch
N/A
Bycatch species
Phocoena phocoena (Harbor porpoise)
Reduction technique
Small mesh size
Fishing Gear
Trawls

Elasmobranch captures in the Fijian pelagic longline fishery

Study Type
Field study in the wild
Location
Fiji
Target catch
Tuna
Effect on bycatch species
27 species of elasmobranchs were observed caught. Catch rates were higher on J-shaped compared to circle hooks. Blue sharks and pelagic stingrays were the most common shark/ray.
Effect on target catch
N/A
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Elasmobranch captures in the Fijian pelagic longline fishery

Study Type
Field study in the wild
Location
Fiji
Target catch
Tuna
Effect on bycatch species
27 species of elasmobranchs were observed caught. Catch rates were higher on J-shaped compared to circle hooks. Blue sharks and pelagic stingrays were the most common shark/ray.
Effect on target catch
N/A
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Elasmobranch captures in the Fijian pelagic longline fishery

Study Type
Field study in the wild
Location
Fiji
Target catch
Tuna
Effect on bycatch species
27 species of elasmobranchs were observed caught. Catch rates were higher on J-shaped compared to circle hooks. Blue sharks and pelagic stingrays were the most common shark/ray.
Effect on target catch
N/A
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines
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