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Field Study 718

Study Type
Field study in the wild
Location
Cornwall
Target catch
Monkfish
Effect on bycatch species
One incidentally caught harbor porpoise; significant reduction in the number of porpoise clicks at nets with pingers. Pinger effects stronger at quiet sites; no habituation observed, exclusion of porpoises following pinger use for as much as 7 hrs
Effect on target catch
None reported
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Phocoena phocoena (Harbor porpoise)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Field Study 718

Study Type
Field study in the wild
Location
Cornwall
Target catch
Monkfish
Effect on bycatch species
One incidentally caught harbor porpoise; significant reduction in the number of porpoise clicks at nets with pingers. Pinger effects stronger at quiet sites; no habituation observed, exclusion of porpoises following pinger use for as much as 7 hrs
Effect on target catch
None reported
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Phocoena phocoena (Harbor porpoise)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Field Study 718

Study Type
Field study in the wild
Location
Cornwall
Target catch
Monkfish
Effect on bycatch species
One incidentally caught harbor porpoise; significant reduction in the number of porpoise clicks at nets with pingers. Pinger effects stronger at quiet sites; no habituation observed, exclusion of porpoises following pinger use for as much as 7 hrs
Effect on target catch
None reported
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Phocoena phocoena (Harbor porpoise)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Field Study 718

Study Type
Field study in the wild
Location
Cornwall
Target catch
Monkfish
Effect on bycatch species
One incidentally caught harbor porpoise; significant reduction in the number of porpoise clicks at nets with pingers. Pinger effects stronger at quiet sites; no habituation observed, exclusion of porpoises following pinger use for as much as 7 hrs
Effect on target catch
None reported
Bycatch species
Small Cetaceans (maximum length < 7.5 meters)
Phocoena phocoena (Harbor porpoise)
Reduction technique
Acoustic deterrent devices
Fishing Gear
Gillnets

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 723

Study Type
Field study in the wild
Location
Western North Atlantic
Target catch
Swordfish and tuna
Effect on bycatch species
Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait
Effect on target catch
Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.
Bycatch species
Elasmobranchs
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Circle hooks
Fishing Gear
Hooks-and-Lines
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