Skates/Rays

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

Study Type: 

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: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Reducing longline bycatch: the larger the hook, the fewer the stingrays

Study Type: 

wild

Location: 

Central Mediterranean SEa

Target catch: 

Swordfish

Effect on bycatch species: 

Bait size did not have a significant effect on stingray catch rates

Effect on target catch: 

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Reducing longline bycatch: the larger the hook, the fewer the stingrays

Study Type: 

wild

Location: 

Central Mediterranean SEa

Target catch: 

Swordfish

Effect on bycatch species: 

Light attractants did not have a significant effect on stringray catch rate

Effect on target catch: 

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type: 

wild

Location: 

Equatorial Atlantic Ocean

Target catch: 

Tuna

Effect on bycatch species: 

Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used

Effect on target catch: 

Bigeye tuna had higher catch rates when circle hooks were used

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field investigation of rare-earth metal as a deterrent to spiny dogfish in the Pacific halibut fishery

Study Type: 

wild

Location: 

Alaska

Target catch: 

Pacific halibut

Effect on bycatch species: 

Experimental hooks resulted in greater reduction on catch of longnose skate

Effect on target catch: 

Did not affect catches

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study

Study Type: 

lab

Location: 

Macduff Marine Aquarium, UK

Target catch: 

n/a

Effect on bycatch species: 

Species significantly avoided magnets

Effect on target catch: 

n/a

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 844

Study Type: 

wild

Location: 

Venezuela

Target catch: 

shrimp

Effect on bycatch species: 

Decrease of 26-32%

Effect on target catch: 

Maintained or increased

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Thorny skate

Species: 

Amblyraja radiata

Type: 

Fish

Distribution: 

Northeast and Northwest Atlantic

Population: 

Decreasing

Bycatch Threat: 

Trawls, dredges

IUCN Status: 

Vulnerable

Data from the Northwest Atlantic suggests that the thorny skate began declining in the early 1980s and accelerated in the early 1990s (Burgess et al 2005). In US waters, dredging for scallops also poses a risk (Packer et al 2003). Additionally, a targeted fishery for the species emerged in Canada in order to meet a growing European demand for skate wings (Kulka et al 2009). Bycatch in Canadian waters occurs on the Scotian Shelf, though landings do not equal those of the targeted fishery (Kulka et al 2009).

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