Unanswered Forum Topics

An interview-based investigation of marine megafauna bycatch in the northern South China Sea

Submitted by allykristan on

This study investigated bycatch events in the northern South China Sea through interviews of fishers. The majority of interviewed fishers reported an estimated 7,464 annual bycatch events, with sea turtles encountered most commonly followed by Indo-Pacific finless porpoises, whale sharks, and Indo-Pacific humpback dolphins. The gear most associated with bycatch were gillnets, trawl nets, and seine nets. Modeling suggests that bycatch may be influenced by distance from the coast and water depth for marine mammals and sea turtles, but by administrative region for whale sharks.

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Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Study Type
Field study in the wild
Location
North Sea
Target catch
Norway pout (Trisopterus esmarkii)
Effect on bycatch species
bycatch was significantly reduced (in weight) for nine whitefish species
Effect on target catch
no significant difference in target catch (weight)
Bycatch species
Reduction technique
Fishing Gear

Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Study Type
Field study in the wild
Location
North Sea
Target catch
Norway pout (Trisopterus esmarkii)
Effect on bycatch species
bycatch was significantly reduced (in weight) for nine whitefish species
Effect on target catch
no significant difference in target catch (weight)
Bycatch species
Reduction technique
Fishing Gear

Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Study Type
Field study in the wild
Location
North Sea
Target catch
Norway pout (Trisopterus esmarkii)
Effect on bycatch species
bycatch was significantly reduced (in weight) for nine whitefish species
Effect on target catch
no significant difference in target catch (weight)
Bycatch species
Reduction technique
Fishing Gear

Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Submitted by allykristan on

Through fishing trials conducted in the North Sea, this study compared the bycatch reduction capacity in the Norway pout (Trisopterus esmarkii) small-meshed trawl fishery between trawls fitted with a standard sorting grid and trawls fitted with a new, more flexible system called the 'Excluder". The trawls fitted with the Excluder significantly reduced the bycatch (in weight) of nine whitefish species: blue whiting, mackerel, horse mackerel, herring, haddock, whiting, cod, European hake, and greater argentine.

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Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Submitted by allykristan on

Through fishing trials conducted in the North Sea, this study compared the bycatch reduction capacity in the Norway pout (Trisopterus esmarkii) small-meshed trawl fishery between trawls fitted with a standard sorting grid and trawls fitted with a new, more flexible system called the 'Excluder". The trawls fitted with the Excluder significantly reduced the bycatch (in weight) of nine whitefish species: blue whiting, mackerel, horse mackerel, herring, haddock, whiting, cod, European hake, and greater argentine.

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Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Submitted by allykristan on

Through fishing trials conducted in the North Sea, this study compared the bycatch reduction capacity in the Norway pout (Trisopterus esmarkii) small-meshed trawl fishery between trawls fitted with a standard sorting grid and trawls fitted with a new, more flexible system called the 'Excluder". The trawls fitted with the Excluder significantly reduced the bycatch (in weight) of nine whitefish species: blue whiting, mackerel, horse mackerel, herring, haddock, whiting, cod, European hake, and greater argentine.

Read More

Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Submitted by allykristan on

Through fishing trials conducted in the North Sea, this study compared the bycatch reduction capacity in the Norway pout (Trisopterus esmarkii) small-meshed trawl fishery between trawls fitted with a standard sorting grid and trawls fitted with a new, more flexible system called the 'Excluder". The trawls fitted with the Excluder significantly reduced the bycatch (in weight) of nine whitefish species: blue whiting, mackerel, horse mackerel, herring, haddock, whiting, cod, European hake, and greater argentine.

Read More

Improved bycatch reduction in the mixed demersal trawl fishery for Norway pout (Trisopterus esmarkii)

Submitted by allykristan on

Through fishing trials conducted in the North Sea, this study compared the bycatch reduction capacity in the Norway pout (Trisopterus esmarkii) small-meshed trawl fishery between trawls fitted with a standard sorting grid and trawls fitted with a new, more flexible system called the 'Excluder". The trawls fitted with the Excluder significantly reduced the bycatch (in weight) of nine whitefish species: blue whiting, mackerel, horse mackerel, herring, haddock, whiting, cod, European hake, and greater argentine.

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Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Study Type
Field study in the wild
Location
Ólafsvík, Iceland
Target catch
Atlantic cod (Gadus morhua)
Effect on bycatch species
increase; LED-equipped nets caught significantly MORE seabirds
Effect on target catch
slight but statistically insignificant reduction in fish catches
Bycatch species
Reduction technique
Fishing Gear

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Study Type
Field study in the wild
Location
Ólafsvík, Iceland
Target catch
Atlantic cod (Gadus morhua)
Effect on bycatch species
increase; LED-equipped nets caught significantly MORE seabirds
Effect on target catch
slight but statistically insignificant reduction in fish catches
Bycatch species
Reduction technique
Fishing Gear

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Study Type
Field study in the wild
Location
Ólafsvík, Iceland
Target catch
Atlantic cod (Gadus morhua)
Effect on bycatch species
increase; LED-equipped nets caught significantly MORE seabirds
Effect on target catch
slight but statistically insignificant reduction in fish catches
Bycatch species
Reduction technique
Fishing Gear

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Submitted by allykristan on

 The present study tested LED lights in paired trials of a commercial gillnet fishery targeting Atlantic cod (Gadus morhua) in Iceland, due to previous studies that suggest attaching LED lights to gillnets to reduce seabird bycatch. The LED-equipped sets actually caught significantly more seabirds (mainly northern gannets and northern fulmars), and slightly (but statistically insignificant) reduced fish catch. While the use of LED lights on gillnets may reduce bycatch of some species, some bird species appear to be attracted to the lights.

 

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Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Submitted by allykristan on

 The present study tested LED lights in paired trials of a commercial gillnet fishery targeting Atlantic cod (Gadus morhua) in Iceland, due to previous studies that suggest attaching LED lights to gillnets to reduce seabird bycatch. The LED-equipped sets actually caught significantly more seabirds (mainly northern gannets and northern fulmars), and slightly (but statistically insignificant) reduced fish catch. While the use of LED lights on gillnets may reduce bycatch of some species, some bird species appear to be attracted to the lights.

 

Read More

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Submitted by allykristan on

 The present study tested LED lights in paired trials of a commercial gillnet fishery targeting Atlantic cod (Gadus morhua) in Iceland, due to previous studies that suggest attaching LED lights to gillnets to reduce seabird bycatch. The LED-equipped sets actually caught significantly more seabirds (mainly northern gannets and northern fulmars), and slightly (but statistically insignificant) reduced fish catch. While the use of LED lights on gillnets may reduce bycatch of some species, some bird species appear to be attracted to the lights.

 

Read More

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Submitted by allykristan on

 The present study tested LED lights in paired trials of a commercial gillnet fishery targeting Atlantic cod (Gadus morhua) in Iceland, due to previous studies that suggest attaching LED lights to gillnets to reduce seabird bycatch. The LED-equipped sets actually caught significantly more seabirds (mainly northern gannets and northern fulmars), and slightly (but statistically insignificant) reduced fish catch. While the use of LED lights on gillnets may reduce bycatch of some species, some bird species appear to be attracted to the lights.

 

Read More

Increase in bycatch rates of plunge- and surface- feeding seabirds observed while setting and hauling bottom set gillnets equipped with LED lights

Submitted by allykristan on

 The present study tested LED lights in paired trials of a commercial gillnet fishery targeting Atlantic cod (Gadus morhua) in Iceland, due to previous studies that suggest attaching LED lights to gillnets to reduce seabird bycatch. The LED-equipped sets actually caught significantly more seabirds (mainly northern gannets and northern fulmars), and slightly (but statistically insignificant) reduced fish catch. While the use of LED lights on gillnets may reduce bycatch of some species, some bird species appear to be attracted to the lights.

 

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Global prevalence of setting longlines at dawn highlights bycatch risk for threatened albatross

Submitted by allykristan on

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

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Global prevalence of setting longlines at dawn highlights bycatch risk for threatened albatross

Submitted by allykristan on

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

Read More