Invertebrates

Mitigating the bycatch of giant cuttlefish Sepia apama and blue swimmer crabs Portunus armatus in an Australian penaeid-trawl fishery

Study Type: 

wild

Location: 

Spencer Gulf

Target catch: 

King prawn

Effect on bycatch species: 

Reduced capture of giant cuttlefish and blue swimmer crabs by 30-50%

Effect on target catch: 

Catch of target species was not affected

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Bycatch reduction devices (BRDs) to reduce the incidental catch of cuttlefish in the Spencer Gulf prawn fishery

Study Type: 

wild

Location: 

Spencer Gulf

Target catch: 

Prawn

Effect on bycatch species: 

Small and large grids reduced number and weight of cuttlefish and crabs

Effect on target catch: 

Small grid caught less prawns compared to large grid and control nets

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Field Study 844

Study Type: 

wild

Location: 

Venezuela

Target catch: 

shrimp

Effect on bycatch species: 

Decrease of 26-32%

Effect on target catch: 

Maintained or increased

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Field Study 804

Study Type: 

wild

Location: 

North Sea

Target catch: 

Plaice and sole

Effect on bycatch species: 

Significantly fewer invertebrates; no difference in undersized plaice; significantly fewer undersized sole

Effect on target catch: 

Significantly fewer plaice and sole

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Field Study 736

Study Type: 

wild

Location: 

Isle of Man

Target catch: 

Queen scallop

Effect on bycatch species: 

There was no significant difference in the abundance of bycatch between the traditional and new "Newhaven" dredge design.

Effect on target catch: 

The new "Newhaven" dredge caught significantly more queen scallops than the traditional dredge.

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Corals, Sponges, and Other Benthic Invertebrates

Species: 

Corals, Sponges, and Other Benthic Invertebrates
Photo: David Obura
Photo: David Obura

Type: 

Invertebrate

Distribution: 

Wordwide, in suitable habitats

Population: 

Variable, but largely unknown

Bycatch Threat: 

Bottom trawls, dredges, gillnets

IUCN Status: 

Unknown

Non-target benthic invertebrates are caught as bycatch in huge volumes, but precise numbers are not available.

Field Study 371

Study Type: 

wild

Location: 

Izmir Bay, Turkey

Target catch: 

Prawns

Effect on bycatch species: 

Trial 1, experimental net caught 44% fewer crabs and mantis shrimp and 49% fewer murex than control net. Trial 2, experimental net 1 caught 66% fewer crabs, 27% fewer mantis shrimp and 32% fewer murex, while experiemnetal net 2 caught 51% fewer crabs,

Effect on target catch: 

Trial 1, experimental net 1 caught 17% fewer prawns than the control net. Trial 2, experimental net 2 caught 2% fewer prawns than the control net.

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Field Study 326

Study Type: 

wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Little effect

Effect on target catch: 

Little effect

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Field Study 325

Study Type: 

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%

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