Bony Fishes

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Cumulative selectivity benefits of increasing mesh size and using escape gaps in Australian Portunus armatus traps

Study Type: 

Field study in the wild

Location: 

Southeastern Australia

Target catch: 

Blue swimmer crab (P. armatus)

Effect on bycatch species: 

87% reduction in yellowfin bream, 84% reduction in undersized crab

Effect on target catch: 

No effect

Article: 

Cumulative selectivity benefits of increasing mesh size and using escape gaps in Australian Portunus armatus traps

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Increasing the Selectivity of the Stone Crab Menippe mercenaria Trap by the Addition of a Cull Ring

Study Type: 

Field study in the wild

Location: 

Florida, USA

Target catch: 

Stone crab (Menippe mercenaria)

Effect on bycatch species: 

Decreased catch of bycatch species and pre-recruit stone crabs

Effect on target catch: 

No effect

Article: 

Increasing the Selectivity of the Stone Crab Menippe mercenaria Trap by the Addition of a Cull Ring

Bycatch species: 

Reduction technique: 

Fishing Gear: 

The efficiency of sieve‐panels for bycatch separation in Nephrops trawls

Study Type: 

Field study in the wild

Location: 

Skagerrak, Norway

Target catch: 

Norway lobster (Nephrops norvegicus)

Effect on bycatch species: 

Bycatch of roundfish and flatfish was low

Effect on target catch: 

Optimal catch size of large Nephrops was too low for commercial use

Article: 

The efficiency of sieve‐panels for bycatch separation in Nephrops trawls

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Using vertical distribution to separate fish from crustaceans in a mixed species trawl fishery

Study Type: 

Field study in the wild

Location: 

Skagerrak, Norway

Target catch: 

Norway lobster (Nephrops norvegicus)

Effect on bycatch species: 

The majority of fish were separated successfully into the upper compartment

Effect on target catch: 

Not tested

Article: 

Using vertical distribution to separate fish from crustaceans in a mixed species trawl fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

The effects of hook and bait sizes on size selectivity and capture efficiency in Icelandic longline fisheries

Study Type: 

Field study in the wild

Location: 

Iceland

Target catch: 

Large bait decreased haddock catch and caught more large species except ling. Larger hooks lowered catch efficiency but had minimal effect in size selectivity

Effect on target catch: 

Large bait increased catch of large fish of all target species except for ling, and reduce catch of haddock. Increasing hook size decreased capture efficiency for all target fish species.Large bait decreased catch of small fish

Article: 

The effects of hook and bait sizes on size selectivity and capture efficiency in Icelandic longline fisheries

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Unique improved selective fishing traps with adjustable escape gaps for effective fisheries management

Study Type: 

Field study in the wild

Location: 

Lagos, Epe Lagoons, Nigeria

Target catch: 

Bony fish

Effect on bycatch species: 

Reduced catch of undersized fish

Effect on target catch: 

Not reported

Article: 

Unique improved selective fishing traps with adjustable escape gaps for effective fisheries management

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Optimizing mesh size with escape gaps in a dual-species portunid-trap fishery

Study Type: 

Field study in the wild

Location: 

Southeastern Australia

Target catch: 

giant mud crabs (Scylla serrata), blue swimmer crabs (Portunus armatus)

Effect on bycatch species: 

91-mm traps retained significantly fewer (by 42%) undersized P. armatus and A. australis. In the second experiment, fewer undersized S. serrata, P. armatus, and A. australis were retained in all larger meshed traps, and in all traps with escape gaps.

Effect on target catch: 

No effect

Article: 

Optimizing mesh size with escape gaps in a dual-species portunid-trap fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Release efficiency and selectivity of four different square mesh panel configurations in the Basque mixed bottom trawl fishery

Study Type: 

Field study in the wild

Location: 

Bay of Biscay

Target catch: 

hake (Merluccius merluccius), megrim (Lepidorhombus, spp.), and anglerfish (Lophius spp.)

Effect on bycatch species: 

Increasing panel size increased escapes of blue whiting

Effect on target catch: 

Placing the square mesh panel lower in. the trawl net panel increased escape of undersized hake

Article: 

Release efficiency and selectivity of four different square mesh panel configurations in the Basque mixed bottom trawl fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Escapement patterns of red mullet, sole, horse mackerel and hake facing two trawl selective devices

Study Type: 

Field study in the wild

Location: 

Bay of Biscay

Target catch: 

Norway lobster (Nephrops norvegicus), demersal fish

Effect on bycatch species: 

Horse mackerel and hake escaped through the two devices tested. More sole were caught in the SMBRD than with standard gear. T90 mesh resulted in increased escape of red mullet.

Effect on target catch: 

Generally unaffected

Bycatch species: 

Reduction technique: 

Fishing Gear: 

The efficacy of illumination to reduce bycatch of eulachon and groundfishes before trawl capture in the eastern North Pacific ocean shrimp fishery

Study Type: 

Field study in the wild

Location: 

Oregon, USA

Target catch: 

Ocean shrimp (Pandalus jordani)

Effect on bycatch species: 

Illumination reduced bycatch of eulachon (Thaleichthys pacificus) and yellowtail rockfish (Sebastes flavidus), but did not result in significant changes in the bycatch of other rockfish (Sebastes spp.) and flatfish

Effect on target catch: 

No change in average catch efficiency or length-dependent catch efficiency.

Article: 

The efficacy of illumination to reduce bycatch of eulachon and groundfishes before trawl capture in the eastern North Pacific ocean shrimp fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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