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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

Field Study 536

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Catch rates on circle hooks were significantly lower than on Japanese style and "J" hooks for 16 and 8 species respectively. Fish length was significantly shorter for four species on Japanese style hooks and for three species on "J" hooks. Survival was
Effect on target catch
There were no significant differences in catch, catch rate or mean length for bigeye tunas. Survival was significantly higher for bigeye tuna caught on circle vs. Japanese style hooks.
Bycatch species
Bony Fishes
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 536

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Catch rates on circle hooks were significantly lower than on Japanese style and "J" hooks for 16 and 8 species respectively. Fish length was significantly shorter for four species on Japanese style hooks and for three species on "J" hooks. Survival was
Effect on target catch
There were no significant differences in catch, catch rate or mean length for bigeye tunas. Survival was significantly higher for bigeye tuna caught on circle vs. Japanese style hooks.
Bycatch species
Bony Fishes
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 536

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Catch rates on circle hooks were significantly lower than on Japanese style and "J" hooks for 16 and 8 species respectively. Fish length was significantly shorter for four species on Japanese style hooks and for three species on "J" hooks. Survival was
Effect on target catch
There were no significant differences in catch, catch rate or mean length for bigeye tunas. Survival was significantly higher for bigeye tuna caught on circle vs. Japanese style hooks.
Bycatch species
Bony Fishes
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 536

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Catch rates on circle hooks were significantly lower than on Japanese style and "J" hooks for 16 and 8 species respectively. Fish length was significantly shorter for four species on Japanese style hooks and for three species on "J" hooks. Survival was
Effect on target catch
There were no significant differences in catch, catch rate or mean length for bigeye tunas. Survival was significantly higher for bigeye tuna caught on circle vs. Japanese style hooks.
Bycatch species
Bony Fishes
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 538

Study Type
Field study in the wild
Location
Florida
Target catch
Shrimp
Effect on bycatch species
Florida fisheye bycatch reduction device (BRD) did not significantly reduce finfish bycatch. The large-mesh extended-mesh funnel BRD significantly reduced bycatch. The simulator cone (used with both BRD's) significantly reduced bycatch.
Effect on target catch
Florida fisheye BRD retained shrimp. The large-mesh extended-mesh funnel BRD had low shrimp loss at Tarpon Springs but at Biscayne Bay shrimp loss was significant. The simulator cone (used with both BRD's) resulted in significant shrimp loss.
Bycatch species
Bony Fishes
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 538

Study Type
Field study in the wild
Location
Florida
Target catch
Shrimp
Effect on bycatch species
Florida fisheye bycatch reduction device (BRD) did not significantly reduce finfish bycatch. The large-mesh extended-mesh funnel BRD significantly reduced bycatch. The simulator cone (used with both BRD's) significantly reduced bycatch.
Effect on target catch
Florida fisheye BRD retained shrimp. The large-mesh extended-mesh funnel BRD had low shrimp loss at Tarpon Springs but at Biscayne Bay shrimp loss was significant. The simulator cone (used with both BRD's) resulted in significant shrimp loss.
Bycatch species
Bony Fishes
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 538

Study Type
Field study in the wild
Location
Florida
Target catch
Shrimp
Effect on bycatch species
Florida fisheye bycatch reduction device (BRD) did not significantly reduce finfish bycatch. The large-mesh extended-mesh funnel BRD significantly reduced bycatch. The simulator cone (used with both BRD's) significantly reduced bycatch.
Effect on target catch
Florida fisheye BRD retained shrimp. The large-mesh extended-mesh funnel BRD had low shrimp loss at Tarpon Springs but at Biscayne Bay shrimp loss was significant. The simulator cone (used with both BRD's) resulted in significant shrimp loss.
Bycatch species
Bony Fishes
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 540

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Statistically more sickle pomfret and fewer wahoo, dolphinfish, blue marlin, striped marlin and shortbill spearfish were caught on the experimental compared to the control sets
Effect on target catch
No significant differences in catch rates between the two set types was found
Bycatch species
Bony Fishes
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 540

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Statistically more sickle pomfret and fewer wahoo, dolphinfish, blue marlin, striped marlin and shortbill spearfish were caught on the experimental compared to the control sets
Effect on target catch
No significant differences in catch rates between the two set types was found
Bycatch species
Bony Fishes
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 540

Study Type
Field study in the wild
Location
Hawaii
Target catch
Bigeye tuna
Effect on bycatch species
Statistically more sickle pomfret and fewer wahoo, dolphinfish, blue marlin, striped marlin and shortbill spearfish were caught on the experimental compared to the control sets
Effect on target catch
No significant differences in catch rates between the two set types was found
Bycatch species
Bony Fishes
Reduction technique
Deep sets
Fishing Gear
Hooks-and-Lines

Field Study 554

Study Type
Field study in the wild
Location
Western Australia
Target catch
Red emperor, scarlet perch, spangled emperor, Rankin cod, blue spot emperor, rosy threadfin brea, flagfish, frypan snapper, red snapper and goldband snapper
Effect on bycatch species
No rays larger than 120 cm were caught when the grid was used
Effect on target catch
None reported
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 554

Study Type
Field study in the wild
Location
Western Australia
Target catch
Red emperor, scarlet perch, spangled emperor, Rankin cod, blue spot emperor, rosy threadfin brea, flagfish, frypan snapper, red snapper and goldband snapper
Effect on bycatch species
No rays larger than 120 cm were caught when the grid was used
Effect on target catch
None reported
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 554

Study Type
Field study in the wild
Location
Western Australia
Target catch
Red emperor, scarlet perch, spangled emperor, Rankin cod, blue spot emperor, rosy threadfin brea, flagfish, frypan snapper, red snapper and goldband snapper
Effect on bycatch species
No rays larger than 120 cm were caught when the grid was used
Effect on target catch
None reported
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 555

Study Type
Field study in the wild
Location
Northern Australia
Target catch
Prawns
Effect on bycatch species
Reduced the number of sharks and rays by 35% when the Popeye Fishbox was placed 70 meshes from the codend draw strings and by 27% when it was placed 100 meshes from the codend draw strings
Effect on target catch
Did not significantly reduce the catch of prawns
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Field Study 555

Study Type
Field study in the wild
Location
Northern Australia
Target catch
Prawns
Effect on bycatch species
Reduced the number of sharks and rays by 35% when the Popeye Fishbox was placed 70 meshes from the codend draw strings and by 27% when it was placed 100 meshes from the codend draw strings
Effect on target catch
Did not significantly reduce the catch of prawns
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls
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