Unanswered Forum Topics

Evaluating the efficacy of various types of guarding nets in minimizing bycatch in a Mediterranean trammel net fishery

Submitted by allykristan on

This study examined the effectiveness of various sizes of guarding nets to reduce bycatch (specifically crustaceans) in cuttlefish trammel net fisheries. All nets did siginificantly reduce crustacean capture, notably spider crabs, but only the smaller mesh guarding net (20mm instead of 40mm) had no significant impact on target cuttlefish catch. However, guardnets may benefit fishers overall by avoiding later delays in disentangling bycatch and damage to gear. 

 

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Evaluating the efficacy of various types of guarding nets in minimizing bycatch in a Mediterranean trammel net fishery

Submitted by allykristan on

This study examined the effectiveness of various sizes of guarding nets to reduce bycatch (specifically crustaceans) in cuttlefish trammel net fisheries. All nets did siginificantly reduce crustacean capture, notably spider crabs, but only the smaller mesh guarding net (20mm instead of 40mm) had no significant impact on target cuttlefish catch. However, guardnets may benefit fishers overall by avoiding later delays in disentangling bycatch and damage to gear. 

 

Read More

Evaluating the efficacy of various types of guarding nets in minimizing bycatch in a Mediterranean trammel net fishery

Submitted by allykristan on

This study examined the effectiveness of various sizes of guarding nets to reduce bycatch (specifically crustaceans) in cuttlefish trammel net fisheries. All nets did siginificantly reduce crustacean capture, notably spider crabs, but only the smaller mesh guarding net (20mm instead of 40mm) had no significant impact on target cuttlefish catch. However, guardnets may benefit fishers overall by avoiding later delays in disentangling bycatch and damage to gear. 

 

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Effects of hook size on the catch variation, size selectivity, and bycatch of the bottom set longline fisheries targeting nemipterid fishes in the Philippines

Study Type
Field study in the wild
Location
Philippines
Target catch
fish (nemipterid)
Effect on bycatch species
larger hook sizes yielded less bycatch
Effect on target catch
smaller hooks yieled higher catch by count and weight, but larger hooks yielded larger individual target fish
Reduction technique
Fishing Gear

Effects of hook size on the catch variation, size selectivity, and bycatch of the bottom set longline fisheries targeting nemipterid fishes in the Philippines

Study Type
Field study in the wild
Location
Philippines
Target catch
fish (nemipterid)
Effect on bycatch species
larger hook sizes yielded less bycatch
Effect on target catch
smaller hooks yieled higher catch by count and weight, but larger hooks yielded larger individual target fish
Reduction technique
Fishing Gear

Effects of hook size on the catch variation, size selectivity, and bycatch of the bottom set longline fisheries targeting nemipterid fishes in the Philippines

Submitted by allykristan on

This study investigated 11 different longline hook sizes to increase catch of nemipterid fisheries  while reducing bycatch in the Phillippines. The largest hook demonstrated the lowest catch in count and weight, but did catch larger individual fish. Middle-sized hooks led to higher target catch, but also higher bycatch. The authors suggest that larger hooks would increase individual catch sizes and reduce bycatch, and that regulation of hook sizes is essential for for sustainable fishery management.

 

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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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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

Submitted by allykristan on

This study tested the use of an excluder grid with 90mm bar spacing to reduce bycatch of blackmouth catshark (Galeus melastomus) in  demersal trawl fisheries in the Mediterannean. The 90mm excluder grid was not very efficient in reducing blackmouth catshark bycatch because only the larger individuals were excluded, and the target catches of greater forkbeard fish (Phycis blennoides) and (to a lesser extent) Norwegian lobster (N. norvegicus) was reduced.

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

Submitted by allykristan on

This study tested the use of an excluder grid with 90mm bar spacing to reduce bycatch of blackmouth catshark (Galeus melastomus) in  demersal trawl fisheries in the Mediterannean. The 90mm excluder grid was not very efficient in reducing blackmouth catshark bycatch because only the larger individuals were excluded, and the target catches of greater forkbeard fish (Phycis blennoides) and (to a lesser extent) Norwegian lobster (N. norvegicus) was reduced.

Read More

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

Submitted by allykristan on

This study tested the use of an excluder grid with 90mm bar spacing to reduce bycatch of blackmouth catshark (Galeus melastomus) in  demersal trawl fisheries in the Mediterannean. The 90mm excluder grid was not very efficient in reducing blackmouth catshark bycatch because only the larger individuals were excluded, and the target catches of greater forkbeard fish (Phycis blennoides) and (to a lesser extent) Norwegian lobster (N. norvegicus) was reduced.

Read More

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

Submitted by allykristan on

This study tested the use of an excluder grid with 90mm bar spacing to reduce bycatch of blackmouth catshark (Galeus melastomus) in  demersal trawl fisheries in the Mediterannean. The 90mm excluder grid was not very efficient in reducing blackmouth catshark bycatch because only the larger individuals were excluded, and the target catches of greater forkbeard fish (Phycis blennoides) and (to a lesser extent) Norwegian lobster (N. norvegicus) was reduced.

Read More

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

Submitted by allykristan on

This study tested the use of an excluder grid with 90mm bar spacing to reduce bycatch of blackmouth catshark (Galeus melastomus) in  demersal trawl fisheries in the Mediterannean. The 90mm excluder grid was not very efficient in reducing blackmouth catshark bycatch because only the larger individuals were excluded, and the target catches of greater forkbeard fish (Phycis blennoides) and (to a lesser extent) Norwegian lobster (N. norvegicus) was reduced.

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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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear

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
Reduction technique
Fishing Gear