Electromagnetic deterrents

Electromagnetic fields created in the vicinity of a fishing activity to deter interaction of non-target species with fishing gear, bait, or target species. The main prize of the 2006 Smart Gear competition run by the World Wildlife Fund was for a magnetic shark deterrent to be tested on pelagic longlines. Polet et al. (2005) describe evaluations of an "electro-trawl" in which electric charges stimulated shrimp into moving upward from the sea floor into the path of the trawl mouth. In this approach, the space between the groundrope and the benthos might be increased without reducing target catch levels but decreasing the contact the trawl might have with some non-target benthic invertebrates and groundfish.

Determining the safety range of electrical pulses for two benthic invertebrates: brown shrimp (Crangon crangon L.) and ragworm (Alitta virens S.)

Hooks equipped with magnets can increase catches of blue shark (Prionace glauca) by longline fishery

Study Type: 

wild

Location: 

NE Atlantic

Target catch: 

Tuna and blue sharks

Effect on bycatch species: 

Magnets increased and did not decrease blue shark catch rates. Larger magnets had a stronger effect.

Effect on target catch: 

None reported

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Field Study

Study Type: 

lab

Location: 

Macduff Marine Aquarium, UK

Target catch: 

n/a

Effect on bycatch species: 

Species significantly avoided magnets

Effect on target catch: 

n/a

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Field Study 798

Study Type: 

wild

Location: 

Scotian Shelf

Target catch: 

Swordfish

Effect on bycatch species: 

No effect

Effect on target catch: 

Significantly reduced on hooks treated with control lead (56%) and Nd/Pr (48%)

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