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Field Study 657

Study Type
Field study in the wild
Location
Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Blue and oceanic whitetip shark bycatch increased.
Effect on target catch
Tuna catches were significantly higher, but lengths for bigeye and skipjack were smaller; shortbill spearfish and striped marlin catch was lower; no difference in swordfish catch rates, but lengths were greater
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 657

Study Type
Field study in the wild
Location
Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Blue and oceanic whitetip shark bycatch increased.
Effect on target catch
Tuna catches were significantly higher, but lengths for bigeye and skipjack were smaller; shortbill spearfish and striped marlin catch was lower; no difference in swordfish catch rates, but lengths were greater
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 657

Study Type
Field study in the wild
Location
Pacific Ocean
Target catch
Tuna
Effect on bycatch species
Blue and oceanic whitetip shark bycatch increased.
Effect on target catch
Tuna catches were significantly higher, but lengths for bigeye and skipjack were smaller; shortbill spearfish and striped marlin catch was lower; no difference in swordfish catch rates, but lengths were greater
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Billfish and tuna
Effect on bycatch species
Significant differences were found between J4 and C15 and between J4 and C18.
Effect on target catch
Significant differences between catch rates were only found between the J-4 and C18 hooks. Large circle hooks (C18) had the lowest catch rates for tunas and small circle hooks (C15) had the lowest catch rates for billfish
Bycatch species
Bony Fishes
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Billfish and tuna
Effect on bycatch species
Significant differences were found between J4 and C15 and between J4 and C18.
Effect on target catch
Significant differences between catch rates were only found between the J-4 and C18 hooks. Large circle hooks (C18) had the lowest catch rates for tunas and small circle hooks (C15) had the lowest catch rates for billfish
Bycatch species
Bony Fishes
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Billfish and tuna
Effect on bycatch species
Significant differences were found between J4 and C15 and between J4 and C18.
Effect on target catch
Significant differences between catch rates were only found between the J-4 and C18 hooks. Large circle hooks (C18) had the lowest catch rates for tunas and small circle hooks (C15) had the lowest catch rates for billfish
Bycatch species
Bony Fishes
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study

Study Type
Field study in the wild
Location
Eastern Pacific Ocean
Target catch
Billfish and tuna
Effect on bycatch species
Significant differences were found between J4 and C15 and between J4 and C18.
Effect on target catch
Significant differences between catch rates were only found between the J-4 and C18 hooks. Large circle hooks (C18) had the lowest catch rates for tunas and small circle hooks (C15) had the lowest catch rates for billfish
Bycatch species
Bony Fishes
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study

Study Type
Field study in the wild
Location
Lake Opinicon, Canada
Target catch
Bluegill and other bony fish
Effect on bycatch species
The exclusion device with bars across the net significantly reduced turtle catch rates. All turtles were able to escape through the escape chimney.
Effect on target catch
Fish catch rates were not impacted by either excluder device. The majority (88%) of fish were retained when the escape chimney was used.
Bycatch species
Terrapins
Reduction technique
Excluder devices
Fishing Gear
Surrounding nets

Field Study

Study Type
Field study in the wild
Location
Lake Opinicon, Canada
Target catch
Bluegill and other bony fish
Effect on bycatch species
The exclusion device with bars across the net significantly reduced turtle catch rates. All turtles were able to escape through the escape chimney.
Effect on target catch
Fish catch rates were not impacted by either excluder device. The majority (88%) of fish were retained when the escape chimney was used.
Bycatch species
Terrapins
Reduction technique
Excluder devices
Fishing Gear
Surrounding nets
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