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

Study Type
Field study in the wild
Location
Western Mediterannean
Target catch
Norway lobster (Nephrops norvegicus), greater forkbeard (Phycis blennoides)
Effect on bycatch species
blackmouth catshark (Galeus melastomus)-bigger individuals escaped ahead of the grid, but smaller individuals did not
Effect on target catch
reduced catch of greater forkbeard and Norway lobster, but impact was more significant for greater forkbeard
Bycatch species
Sharks
Reduction technique
Excluder devices
Fishing Gear
Trawls

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

Study Type
Field study in the wild
Location
Western Mediterannean
Target catch
Norway lobster (Nephrops norvegicus), greater forkbeard (Phycis blennoides)
Effect on bycatch species
blackmouth catshark (Galeus melastomus)-bigger individuals escaped ahead of the grid, but smaller individuals did not
Effect on target catch
reduced catch of greater forkbeard and Norway lobster, but impact was more significant for greater forkbeard
Bycatch species
Sharks
Reduction technique
Excluder devices
Fishing Gear
Trawls

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
bony fishes and crustaceans
Effect on bycatch species
Shark Excluder Device (SED) was effective in reducing elasmobranch bycatch
Effect on target catch
SED had no effect on mantis shrimp (Squilla mantis), but did reduce some target bony fish species catch
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
bony fishes and crustaceans
Effect on bycatch species
Shark Excluder Device (SED) was effective in reducing elasmobranch bycatch
Effect on target catch
SED had no effect on mantis shrimp (Squilla mantis), but did reduce some target bony fish species catch
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
bony fishes and crustaceans
Effect on bycatch species
Shark Excluder Device (SED) was effective in reducing elasmobranch bycatch
Effect on target catch
SED had no effect on mantis shrimp (Squilla mantis), but did reduce some target bony fish species catch
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Trawls

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
Red mullet (Mullus barbatus), European hake (Merluccius merluccius), mantis shrimp
Effect on bycatch species
Flexgrid effectiveness in reducing elasmobranch catch was inconclusive (small sample size)
Effect on target catch
no effect on target bony fish and mantis shrimp catches
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Traps

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
Red mullet (Mullus barbatus), European hake (Merluccius merluccius), mantis shrimp
Effect on bycatch species
Flexgrid effectiveness in reducing elasmobranch catch was inconclusive (small sample size)
Effect on target catch
no effect on target bony fish and mantis shrimp catches
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Traps

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Study Type
Field study in the wild
Location
Adriatic Sea
Target catch
Red mullet (Mullus barbatus), European hake (Merluccius merluccius), mantis shrimp
Effect on bycatch species
Flexgrid effectiveness in reducing elasmobranch catch was inconclusive (small sample size)
Effect on target catch
no effect on target bony fish and mantis shrimp catches
Bycatch species
Elasmobranchs
Reduction technique
Excluder devices
Fishing Gear
Traps

Buoys with looming eyes deter seaducks and could potentially reduce seabird bycatch in gillnets

Study Type
Field study in the wild
Location
Küdema Bay, island of Saaremaa, Estonia
Target catch
n/a
Effect on bycatch species
reduced long-tailed duck bycatch by 20–30% within a 50 m radius
Effect on target catch
not measured, but assumed to be minimal as this is an above-water technique that does not alter fishing methods
Bycatch species
Seabirds
Reduction technique
Visual deterrents
Fishing Gear
Gillnets

Buoys with looming eyes deter seaducks and could potentially reduce seabird bycatch in gillnets

Study Type
Field study in the wild
Location
Küdema Bay, island of Saaremaa, Estonia
Target catch
n/a
Effect on bycatch species
reduced long-tailed duck bycatch by 20–30% within a 50 m radius
Effect on target catch
not measured, but assumed to be minimal as this is an above-water technique that does not alter fishing methods
Bycatch species
Seabirds
Reduction technique
Visual deterrents
Fishing Gear
Gillnets

Buoys with looming eyes deter seaducks and could potentially reduce seabird bycatch in gillnets

Study Type
Field study in the wild
Location
Küdema Bay, island of Saaremaa, Estonia
Target catch
n/a
Effect on bycatch species
reduced long-tailed duck bycatch by 20–30% within a 50 m radius
Effect on target catch
not measured, but assumed to be minimal as this is an above-water technique that does not alter fishing methods
Bycatch species
Seabirds
Reduction technique
Visual deterrents
Fishing Gear
Gillnets

Illuminating gillnets to save seabirds and the potential for multi-taxa bycatch mitigation

Study Type
Field study in the wild
Location
Sechura Bay, Peru
Target catch
fish: (Paralichtys spp.), guitarfish (Rhinobatos planiceps), rays (superorder Batoidea
Effect on bycatch species
significant reduction (85.1% for guanay cormorants (Phalacrocorax bougainvillii))
Effect on target catch
none
Bycatch species
Seabirds
Reduction technique
Visual deterrents
Fishing Gear
Gillnets

Illuminating gillnets to save seabirds and the potential for multi-taxa bycatch mitigation

Study Type
Field study in the wild
Location
Sechura Bay, Peru
Target catch
fish: (Paralichtys spp.), guitarfish (Rhinobatos planiceps), rays (superorder Batoidea
Effect on bycatch species
significant reduction (85.1% for guanay cormorants (Phalacrocorax bougainvillii))
Effect on target catch
none
Bycatch species
Seabirds
Reduction technique
Visual deterrents
Fishing Gear
Gillnets
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