Excluder devices

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. Large animals that strike the bar exit through the opening, while the smaller target species pass through the bars and are captured in the net. Examples of excluder devices in trawls are the Nordmore grid, the Turtle Excluder Device (TED), and the Sea Lion Excluder Device (SLED). A sea turtle excluder chain mat is used in the Northwest Atlantic scallop dredge fishery. A new modification to pound nets may reduce sea turtle bycatch by replacing the upper two-thirds of the leader netting with vertical ropes spaced wide enough apart to let sea turtles swim through without becoming entangled (DeAlteris et al., 2005).

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Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

JT 1 design did not prevent capture of sea turtles

Effect on target catch: 

Caught 6.6% more tiger prawns and 10.5% more endeavour prawns than standard net

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Downward facing TEDs reduced large sponge catches by 95.9%

Effect on target catch: 

Reduced the proportion of soft and damaged prawns by 63.2% and reduced catches of tiger prawns by 6.3%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Upward facing TED's reduced large sponge catches by 81.6%

Effect on target catch: 

Reduced the proportion of soft and damaged prawns by 35.8% and reduced catches of tiger prawns by 6.3%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Reduced ray catches by 17.7%

Effect on target catch: 

Reduced the proportion of soft and damaged prawns by 41.6% and reduced catches of tiger prawns by 6.5%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Reduced shark catches by 36.3%

Effect on target catch: 

Reduced the proportion of soft and damaged prawns by 41.6% and reduced catches of tiger prawns by 6.5%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Downward facing TEDs reduced sea turtle catches by 100%

Effect on target catch: 

Reduced the proportion of soft and damaged prawns by 63.2% and reduced catches of tiger prawns by 6.3%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Reduced the number of sea snakes caught by 87% when the Popeye Fishbox was placed 70 meshes from codend (no analysis was done when the device was placed 100 meshes from codend draw strings)

Effect on target catch: 

Did not significantly reduce the catch of prawns

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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