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Displaying 61 - 70 of 561
Location Gear Catch Technique Bycatch species Type Results
Location

Atlantic and Gulf of Mexico

Gear
Trawls
Catch shrimp Technique
Excluder devices
Bycatch species Sea Turtles Type Field study in the wild Results
Summary: Turtle Excluder Devices reduce sea turtle bycatch in the Atlantic and Gulf of Mexico shrimp trawl fishery.
Effect on Bycatch: Reduced bycatch
Reference:
Renaud, M., J. Nance, E. Scott-Denton, and G.R. Gitschlag, 1997 , Incidental capture of sea turtles in shrimp trawls with and without TEDs in U.S. Atlantic and Gulf Waters
Location

New Zealand

Gear
Trawls
Catch Hoki Technique Bycatch species Pinnipeds Type Field study in the wild Results
Summary:

Acoustic Harassment Devices were not found to be effective in deterring New Zealand fur seals (Arctocephalus forsteri) from mid-water trawls in the New Zealand hoki fishery. Sea Lion Escape Devices are undergoing testing in New Zealand˙s hoki trawl fishery (for fur seals) and the squid trawl fishery (for Hookers˙s sea lion). Preliminary results indicate squid and fish loss via the escape hatch was minimal; in the hoki fishery, fish loss was confined to fast swimming species, including jack mackerel and warehou.

Effect on Bycatch: Did not deter fur seals
Reference:
Stewardson, C.L. and M.W. Cawthorn, 2004 , Technologies to reduce seal-fisheries interactions and mortalities
Location

New Zealand

Gear
Trawls
Catch Hoki Technique
Excluder devices
Bycatch species Pinnipeds Type Field study in the wild Results
Summary:

Acoustic Harassment Devices were not found to be effective in deterring New Zealand fur seals (Arctocephalus forsteri) from mid-water trawls in the New Zealand hoki fishery. Sea Lion Escape Devices are undergoing testing in New Zealand˙s hoki trawl fishery (for fur seals) and the squid trawl fishery (for Hookers˙s sea lion). Preliminary results indicate squid and fish loss via the escape hatch was minimal; in the hoki fishery, fish loss was confined to fast swimming species, including jack mackerel and warehou.

Reference:
Stewardson, C.L. and M.W. Cawthorn, 2004 , Technologies to reduce seal-fisheries interactions and mortalities
Location

Atlantic

Gear
Hooks-and-Lines
Catch Swordfish and tuna Technique
Circle hooks
Bycatch species Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) Type Field study in the wild Results
Summary: Circle hooks significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in Atlantic longline fisheries. Swordfish catch decreased when circle hooks were baited with squid but increased when baited with mackerel. Tuna catch increased when circle hooks were baited with squid but decreased when baited with mackerel.
Effect on Bycatch: Reduced bycatch
Reference:
Watson, J.W., D. Foster, S. Epperly, and A. Shah, 2004 , Experiments in the Western Atlantic Northeast Distant Waters to Evaluate Sea Turtle Mitigation Measures in the Pelagic Longline Fishery. Report on Experiments Conducted in 2001-2003
Location

Azores

Gear
Hooks-and-Lines
Catch Swordfish and blue shark Technique
Circle hooks
Bycatch species Caretta caretta (Loggerhead turtle) Type Field study in the wild Results
Summary:

Circle hooks (non-offset 16/0 and 18/0) did not significantly reduce the number of loggerhead sea turtles (Caretta caretta) caught in the Azores longline swordfish and blue shark fishery when compared with non-offset and offset 9/0 J hooks. Use of circle hooks decreased the rate of throat hooking in loggerhead sea turtles. Circle hooks (non-offset 16/0 and 18/0) caught significantly more blue sharks than J hooks in the Azores longline swordfish and blue shark fisheries. 

Effect on Bycatch: Did not reduce bycatch; reduced rate of throat hooking
Reference:
Bolton, A. and K. Bjorndal, 2003 , Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 2
Location

Azores

Gear
Hooks-and-Lines
Catch Swordfish and blue shark Technique
Circle hooks
Bycatch species Caretta caretta (Loggerhead turtle) Type Field study in the wild Results
Summary:

There was no significant difference in the number of loggerhead sea turtles caught in the Azores longline swordfish and blue shark fishery between straight 16/0, offset 16/0, and offset 18/0 circle hooks. Circle hooks decreased the rate of throat hooking in loggerhead sea turtles caught in the Azores longline swordfish and blue shark fishery. Straight 16/0 circle hooks caught the most blue sharks in the Azores longline swordfish and blue shark fishery, followed by offset 18/0 circle hooks. Offset 16/0 circle hooks caught the fewest blue sharks.

Effect on Bycatch: Decreased throat hooking
Reference:
Bolton, A. and K. Bjorndal, 2004 , Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 3
Location

Azores

Gear
Hooks-and-Lines
Catch Swordfish and blue shark Technique
Circle hooks
Bycatch species Caretta caretta (Loggerhead turtle) Type Field study in the wild Results
Summary:

Japanese tuna hook 3.6mm S/S caught significantly more loggerhead sea turtles than non-offset 16/0 and 18/0 circle hooks and caught more turtles in the throat than the circle hooks in the Azores longline swordfish and blue shark fishery. Non-offset 18/0 circle hooks caught fewer loggerhead sea turtles than non-offset 16/0 circle hooks in the Azores longline swordfish and blue shark fishery. There was no significant difference in the number of blue sharks caught on non-offset 16/0 and 18/0 circle hooks in the Azores longline swordfish and blue shark fishery.

Effect on Bycatch: Non-offset 16/0 and 18/0 circle hooks caught fewer turtles than Japanese tuna hook. Non-offset 18/0 circle hooks caught fewer turtles than non-offset 16/0
Reference:
Bolton, A. and K. Bjorndal, 2005 , Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 4
Location

Azores

Gear
Hooks-and-Lines
Catch Swordfish and blue shark Technique
Circle hooks
Bycatch species Sea Turtles Type Field study in the wild Results
Summary:

Circle hooks (non-offset 16/0 and 18/0) caught significantly more blue sharks than J hooks in the Azores longline swordfish and blue shark fisheries.

Reference:
Bolten, A. and K. Bjorndal, 2002 , Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores
Location

Atlantic

Gear
Hooks-and-Lines
Catch Swordfish and tuna Technique
Dyed bait
Bycatch species Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) Type Field study in the wild Results
Summary: Blue-dyed bait does not significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea)sea turtle captures in the western Atlantic longline fishery.
Effect on Bycatch: Did not reduce bycatch
Reference:
Watson, J., D. Foster, S. Epperly, and A. Shah, 2002 , Experiments in the Western Atlantic Northeast Distant Waters to Evaluate Sea Turtle Mitigation Measures in the Pelagic Longline Fishery. Report on Experiments Conducted in 2001
Location

Canada

Gear
Gillnets
Catch Multiple species Technique
Metal oxide/barium sulfate nets
Bycatch species Small Cetaceans (maximum length < 7.5 meters), Phocoena phocoena (Harbor porpoise), Seabirds Type Field study in the wild Results
Summary: Metal oxide nets containing barium sulphate (that increased their acoustic reflectivity and probably also their stiffness) reduced the bycatch of harbor porpoise (Phocoena phocoena) in an eastern Canada demersal gillnet fishery. No difference in catch of commercial fish species, including cod, pollock, haddock, and spiny dogfish, was observed between the nylon and barium sulphate nets. Metal oxide nets reduced the bycatch of greater shearwater (Puffinus gravis) in an eastern Canada demersal gillnet fishery, probably by increasing the visibility of the blue-dyed nets to the birds.
Effect on Bycatch: Reduced harbor porpoise bycatch
Reference:
Trippel, E.A., N.L. Holy, D.L. Palka, T.D. Shepherd, G.D. Melvin, and J.M. Terhune, 2003 , Nylon barium sulphate gillnet reduces porpoise and seabird mortality

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Trawls

Trawls are cone-shaped nets with two, four, or more panels, ending in a bag. They are towed at midwater or near the bottom, and held open horizontally by heavy doors (otter trawls), by beams, or by the tension created by lines connecting the net to two separate vessels (pair trawls). The net opening is sustained vertically by floats and weights. Fish size and species is controlled by mesh size; pelagic, demersal, and benthic fish can be targeted.

Read More

Excluder devices

These can consist of a grid of metal bars or mesh placed usually within the neck of a trawl that has an opening for escape at either the top or bottom. Examples include “skylights” which consist of a mesh opening located at the top of the codend. ”Skylights” can be combined with guiding funnels that create visual and tactile stimuli to direct finfish towards the “skylight” escape sections.


Read More

Trawls

Trawls are cone-shaped nets with two, four, or more panels, ending in a bag. They are towed at midwater or near the bottom, and held open horizontally by heavy doors (otter trawls), by beams, or by the tension created by lines connecting the net to two separate vessels (pair trawls). The net opening is sustained vertically by floats and weights. Fish size and species is controlled by mesh size; pelagic, demersal, and benthic fish can be targeted.

Read More

Trawls

Trawls are cone-shaped nets with two, four, or more panels, ending in a bag. They are towed at midwater or near the bottom, and held open horizontally by heavy doors (otter trawls), by beams, or by the tension created by lines connecting the net to two separate vessels (pair trawls). The net opening is sustained vertically by floats and weights. Fish size and species is controlled by mesh size; pelagic, demersal, and benthic fish can be targeted.

Read More

Excluder devices

These can consist of a grid of metal bars or mesh placed usually within the neck of a trawl that has an opening for escape at either the top or bottom. Examples include “skylights” which consist of a mesh opening located at the top of the codend. ”Skylights” can be combined with guiding funnels that create visual and tactile stimuli to direct finfish towards the “skylight” escape sections.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear.


Read More

Hooks-and-Lines

Fish are attracted to hooks-and-lines by natural or artificial bair placed on a hook, which captures the fish when it bites the bait. One or multiple lines may be used to catch pelagic, demersal, or benthic species. Different line and hook types are used depending on the target species.

Read More

Dyed bait

Bait dyed blue to reduce its visibility to non-target species such as seabirds hovering around longlines as baited hooks are deployed (Watson et al. 2002).


Read More

Gillnets

Gillnets are single, double, or triple layers of net suspended vertically in the water column. The top of the net is connected to floats (headrope), while the bottom is weighted (footrope). Adjustment of the floats and weights allows gillnets to be positioned at varying depth, depending on the target species. Gillnets are generally deployed in large numbers and trap fish either by entangling the gills or by entangling all or part of the fish body. Variation in net mesh size allows fishermen to control the size of their catch.


Read More

Metal oxide/barium sulfate nets

Nylon nets infused with barium sulfate or other metal compounds that have acoustical detection features for reducing small cetacean bycatch. These may reduce small cetacean and sea turtle bycatch by increasing the likelihood that these animals would “bounce” off the netting.


Read More