Sharks

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Toothed whale and shark depredation indicators: a case study from the Reunion Island and Sechelles pelagic longline fisheries

Study Type: 

Summary study

Location: 

Seychelles and Reunion Island

Target catch: 

Swordfish and tuna

Effect on bycatch species: 

N/A

Effect on target catch: 

Depredation rate was significantly higher for sharks but depredation impact was significantly higher for toothed whales

Article: 

Toothed whale and shark depredation indicators: a case study from the Reunion Island and Sechelles pelagic longline fisheries

Bycatch species: 

Fishing Gear: 

Comparison of bycatch species captured during daytime and nighttime: preliminary results of longline experiments carried out in the Seychelles waters

Study Type: 

Summary study

Location: 

Seychelles

Target catch: 

swordfish and tuna

Effect on bycatch species: 

All marketable species were caught in the 150 m layer during day and night sets.

Effect on target catch: 

Differences in the species composition, quantity and depth of capture for bycatch species

Article: 

Comparison of bycatch species captured during daytime and nighttime: preliminary results of longline experiments carried out in the Seychelles waters

Bycatch species: 

Fishing Gear: 

Hooks equipped with magnets can increase catches of blue shark (Prionace glauca) by longline fishery

Study Type: 

Field study in the wild

Location: 

NE Atlantic

Target catch: 

Tuna and blue sharks

Effect on bycatch species: 

Magnets increased and did not decrease blue shark catch rates. Larger magnets had a stronger effect.

Effect on target catch: 

None reported

Article: 

Hooks equipped with magnets can increase catches of blue shark (Prionace glauca) by longline fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Selective characteristics of a shark-excluding grid device in a Mediterranean trawl

Study Type: 

Field study in the wild

Location: 

Tyrrhenian Sea

Target catch: 

Norway lobster (Nephrops norvegicus) and greater forkbeard (Phycis blennoides)

Effect on bycatch species: 

90 mm excluder grid did not reduce catches of blackmouth catshark (Galeus melastomus)

Effect on target catch: 

90 mm excluder grid reduced catches of greater forkbeard and to a lesser extend Norway lobster

Article: 

Selective characteristics of a shark-excluding grid device in a Mediterranean trawl

Bycatch species: 

Reduction technique: 

Fishing Gear: 

A simple technical measure to reduce bycatch and discard of skates and sharks in mixed-species bottom-trawl fisheries

Study Type: 

Field study in the wild

Location: 

Minch and Stanton Banks

Target catch: 

Whitefish

Effect on bycatch species: 

Removing the 'tickler' chain resulted in decreased catches of sharks and skates

Effect on target catch: 

Catch rates for flatfish, haddock and whiting did not differ. Larger anglerfish were caught without the 'tickler' in place

Article: 

A simple technical measure to reduce bycatch and discard of skates and sharks in mixed-species bottom-trawl fisheries

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Development and observations of spiny dogfish Squalus acanthias reduction device in a raised footrope silver hake Merluccius bilinearis trawl

Study Type: 

Field study in the wild

Location: 

Massachusetts Bay

Target catch: 

Silver hake

Effect on bycatch species: 

There were no observed differences in the behavior of spiny dogfish between gear configurations or grate colors.

Article: 

Development and observations of spiny dogfish Squalus acanthias reduction device in a raised footrope silver hake Merluccius bilinearis trawl

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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) sharks (bottom)

Effect on bycatch species: 

Mortality at haulback was significantly higher for on J-hooks.

Effect on target catch: 

Article: 

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

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study

Study Type: 

Field study in the wild

Location: 

Central Pacific

Target catch: 

pelagic sharks and fishes

Effect on bycatch species: 

examing post-release of blue shark released from longline gear

Effect on target catch: 

examined in other research

Bycatch species: 

Fishing Gear: 

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