Deep sets

Baited hooks in longline fisheries set below 100 meters of water to avoid the principle feeding zones of sea turtles and other epipelagic species. Increasing the depth at which pelagic drift nets are set may also reduce bycatch rates of air-breathing vertebrates.

Field Study 540

Study Type: 

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

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 369

Study Type: 

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

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Effects of eliminating shallow hooks from tuna longline sets on target and non-target species in the Hawaii-based pelagic tuna fishery

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Tuna and swordfish

Effect on bycatch species: 

No differences in catches between experimental and control sets

Effect on target catch: 

Decreased catch of wahoo, dolphinfish, blue and striped marlin, and shortbill species, increased catch of sickle pomfret and opah, and did not affect catch of sharks and pelagic sting rays

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Bigeye tuna

Effect on bycatch species: 

Reduced bycatch

Effect on target catch: 

Increased target catch

Reduction technique: 

Bycatch species: 

Fishing Gear: 

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Bigeye tuna

Effect on bycatch species: 

Reduced bycatch

Effect on target catch: 

Increased target catch

Reduction technique: 

Bycatch species: 

Fishing Gear: