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Field Study 363

Study Type
Field study in the wild
Location
Georges Bank
Target catch
Swordfish
Effect on bycatch species
No signficant difference in catch rates between gangions for loggerhead sea turtles.
Effect on target catch
There were no differences in the mean length at capture, but signficantly more swordfish were caught on the monofilament gangions.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Alternative leader design
Fishing Gear
Hooks-and-Lines

Field Study 363

Study Type
Field study in the wild
Location
Georges Bank
Target catch
Swordfish
Effect on bycatch species
No signficant difference in catch rates between gangions for loggerhead sea turtles.
Effect on target catch
There were no differences in the mean length at capture, but signficantly more swordfish were caught on the monofilament gangions.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Alternative leader design
Fishing Gear
Hooks-and-Lines

Field Study 363

Study Type
Field study in the wild
Location
Georges Bank
Target catch
Swordfish
Effect on bycatch species
No signficant difference in catch rates between gangions for loggerhead sea turtles.
Effect on target catch
There were no differences in the mean length at capture, but signficantly more swordfish were caught on the monofilament gangions.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Alternative leader design
Fishing Gear
Hooks-and-Lines

Field Study 365

Study Type
Field study in the wild
Location
Wollongong, Australia
Target catch
Tuna
Effect on bycatch species
Blue-dyed squid bait reduced subsurface interactions with seabirds by 68%. Seabirds struck only 3-8% of surface blue-dyed squid bait compared with 75-98% of non-dyed squid bait. Birds struck 48% of blue-dyed fish bait at the surface during the first tw
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Dyed bait
Fishing Gear
Hooks-and-Lines

Field Study 365

Study Type
Field study in the wild
Location
Wollongong, Australia
Target catch
Tuna
Effect on bycatch species
Blue-dyed squid bait reduced subsurface interactions with seabirds by 68%. Seabirds struck only 3-8% of surface blue-dyed squid bait compared with 75-98% of non-dyed squid bait. Birds struck 48% of blue-dyed fish bait at the surface during the first tw
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Dyed bait
Fishing Gear
Hooks-and-Lines

Field Study 365

Study Type
Field study in the wild
Location
Wollongong, Australia
Target catch
Tuna
Effect on bycatch species
Blue-dyed squid bait reduced subsurface interactions with seabirds by 68%. Seabirds struck only 3-8% of surface blue-dyed squid bait compared with 75-98% of non-dyed squid bait. Birds struck 48% of blue-dyed fish bait at the surface during the first tw
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Dyed bait
Fishing Gear
Hooks-and-Lines

Field Study 367

Study Type
Field study in the wild
Location
Bay of Bengal
Target catch
Tunas and billfish
Effect on bycatch species
J-hooks caught a higer percentage (74.5%) of bycatch compared to target (25.5%) species, while circle hooks caught a similar percentage of each (53.3% and 46.7% respectively). Bycatch catch rates were higher on J-hooks (5.6 individuals/1,000 hooks) than
Effect on target catch
Target species catch rates were higher on circle hooks (2.2 individuals/1,000 hooks) compared to J-hooks (1.9 individuals/1,000 hooks). Swordfish caught by J-hooks were slightly larger than those caught on circle hooks.
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 367

Study Type
Field study in the wild
Location
Bay of Bengal
Target catch
Tunas and billfish
Effect on bycatch species
J-hooks caught a higer percentage (74.5%) of bycatch compared to target (25.5%) species, while circle hooks caught a similar percentage of each (53.3% and 46.7% respectively). Bycatch catch rates were higher on J-hooks (5.6 individuals/1,000 hooks) than
Effect on target catch
Target species catch rates were higher on circle hooks (2.2 individuals/1,000 hooks) compared to J-hooks (1.9 individuals/1,000 hooks). Swordfish caught by J-hooks were slightly larger than those caught on circle hooks.
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 367

Study Type
Field study in the wild
Location
Bay of Bengal
Target catch
Tunas and billfish
Effect on bycatch species
J-hooks caught a higer percentage (74.5%) of bycatch compared to target (25.5%) species, while circle hooks caught a similar percentage of each (53.3% and 46.7% respectively). Bycatch catch rates were higher on J-hooks (5.6 individuals/1,000 hooks) than
Effect on target catch
Target species catch rates were higher on circle hooks (2.2 individuals/1,000 hooks) compared to J-hooks (1.9 individuals/1,000 hooks). Swordfish caught by J-hooks were slightly larger than those caught on circle hooks.
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 369

Study Type
Field study in the wild
Location
Australia
Target catch
Bigeye tuna
Effect on bycatch species
None reported
Effect on target catch
Weighted longlines had a slightly higher overall CPUE (1.3 fish/100 hooks) compared to traditional longlines (1.08 fish/100 hooks) and caught more bigeye (0.95 fish/ 100 hooks) than traditional longlines (0.56 fish/100 hooks). Catch rates were not very
Bycatch species
Sea Turtles
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 369

Study Type
Field study in the wild
Location
Australia
Target catch
Bigeye tuna
Effect on bycatch species
None reported
Effect on target catch
Weighted longlines had a slightly higher overall CPUE (1.3 fish/100 hooks) compared to traditional longlines (1.08 fish/100 hooks) and caught more bigeye (0.95 fish/ 100 hooks) than traditional longlines (0.56 fish/100 hooks). Catch rates were not very
Bycatch species
Sea Turtles
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 369

Study Type
Field study in the wild
Location
Australia
Target catch
Bigeye tuna
Effect on bycatch species
None reported
Effect on target catch
Weighted longlines had a slightly higher overall CPUE (1.3 fish/100 hooks) compared to traditional longlines (1.08 fish/100 hooks) and caught more bigeye (0.95 fish/ 100 hooks) than traditional longlines (0.56 fish/100 hooks). Catch rates were not very
Bycatch species
Sea Turtles
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 371

Study Type
Field study in the wild
Location
Izmir Bay, Turkey
Target catch
Prawns
Effect on bycatch species
Trial 1, experimental net caught 44% fewer crabs and mantis shrimp and 49% fewer murex than control net. Trial 2, experimental net 1 caught 66% fewer crabs, 27% fewer mantis shrimp and 32% fewer murex, while experiemnetal net 2 caught 51% fewer crabs,
Effect on target catch
Trial 1, experimental net 1 caught 17% fewer prawns than the control net. Trial 2, experimental net 2 caught 2% fewer prawns than the control net.
Bycatch species
Invertebrates
Reduction technique
Sub-surface sets (gillnets)
Fishing Gear
Gillnets

Field Study 371

Study Type
Field study in the wild
Location
Izmir Bay, Turkey
Target catch
Prawns
Effect on bycatch species
Trial 1, experimental net caught 44% fewer crabs and mantis shrimp and 49% fewer murex than control net. Trial 2, experimental net 1 caught 66% fewer crabs, 27% fewer mantis shrimp and 32% fewer murex, while experiemnetal net 2 caught 51% fewer crabs,
Effect on target catch
Trial 1, experimental net 1 caught 17% fewer prawns than the control net. Trial 2, experimental net 2 caught 2% fewer prawns than the control net.
Bycatch species
Invertebrates
Reduction technique
Sub-surface sets (gillnets)
Fishing Gear
Gillnets

Field Study 371

Study Type
Field study in the wild
Location
Izmir Bay, Turkey
Target catch
Prawns
Effect on bycatch species
Trial 1, experimental net caught 44% fewer crabs and mantis shrimp and 49% fewer murex than control net. Trial 2, experimental net 1 caught 66% fewer crabs, 27% fewer mantis shrimp and 32% fewer murex, while experiemnetal net 2 caught 51% fewer crabs,
Effect on target catch
Trial 1, experimental net 1 caught 17% fewer prawns than the control net. Trial 2, experimental net 2 caught 2% fewer prawns than the control net.
Bycatch species
Invertebrates
Reduction technique
Sub-surface sets (gillnets)
Fishing Gear
Gillnets

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
tuna (pelagic) and sharks (bottom)
Effect on bycatch species
CPUE was significantly higher for night, blue, silky, and oceanic whitetip sharks on circle hooks.
Effect on target catch
None reported for pelagic longlines. On bottom longlines, CPUE was higher for blacknose and nurse sharks and southern stingrays; no CPUE difference between hook type; more tiger and blacknose sharks were alive at haulback with circle hooks
Bycatch species
Sharks
Skates/Rays
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
tuna (pelagic) and sharks (bottom)
Effect on bycatch species
CPUE was significantly higher for night, blue, silky, and oceanic whitetip sharks on circle hooks.
Effect on target catch
None reported for pelagic longlines. On bottom longlines, CPUE was higher for blacknose and nurse sharks and southern stingrays; no CPUE difference between hook type; more tiger and blacknose sharks were alive at haulback with circle hooks
Bycatch species
Sharks
Skates/Rays
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines
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