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. Experimental results show that they can be effective in reducing the bycatch of harbor porpoise and greater shearwater (Trippel et al., 2003), though it has not been ascertained if this is due to their acoustic reflectivity or increased stiffness over conventional gillnets.

Reduction of harbor porpoise (Phocoena phocoena) bycatch by iron-oxide gillnets

Study Type: 

wild

Location: 

Danish North Sea

Target catch: 

Cod

Effect on bycatch species: 

Reduced harbour porpoise bycatch

Effect on target catch: 

Reduced by 30%

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Analysis and mitigation of cetacean bycatch in UK fisheries

Study Type: 

wild

Location: 

Scotland

Target catch: 

Trout

Effect on bycatch species: 

Increased bycatch

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Reduction technique: 

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Target strength of a nylon monofilament and an acoustically enhanced gillnet: predictions of biosonar detection ranges

Study Type: 

wild

Location: 

Captivity

Target catch: 

Trout

Effect on bycatch species: 

Increased detectability

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Nylon barium sulphate gillnet reduces porpoise and seabird mortality

Study Type: 

wild

Location: 

Canada

Target catch: 

Multiple species

Effect on bycatch species: 

Reduced harbor porpoise bycatch

Effect on target catch: 

No difference in catch

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