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4 Panel Cod-end
By constructing a 4 panel cod-end, it allows the cod-end to remain more open and increases the flow of water, allowing the fish more space to swim. -
Acoustic deterrents
An acoustic deterrent is a device that emits pulses of high frequency sound to deter cetaceans from approaching fishing gear. -
Amity Net Grid
The amity net grid is a selective device designed to separate nephrops from fish. -
Benthic Panel
A benthic panel is a small panel of square mesh or large diamond mesh inserted in the bottom panel of a trawl. -
Benthos Release Panel
A Benthos or Benthic release panel is a panel of larger diamond mesh or square mesh netting fitted into the lower panel of a trawl. -
Box Trawl
A selective box trawl is made up of 4 panels of netting with these 4 panels carried right down to a 4 panel cod-end. -
Cefas Net Grid
The Cefas Net Grid is a selective device designed to separate nephrops from fish. -
Coverless Trawls
A coverless trawl has the top panel of the net cut back so that the headline and footrope are of similar length. -
Diamond Mesh Size
Most fishing gear is made of netting with diamond shaped meshes, this gives the gear flexibility and a certain amount of stretch. -
Eliminator Trawl
The eliminator trawl is a standard demersal trawl with very large diamond meshes in the wings and forward part of the trawl. -
Escape Gaps
Escape gaps are usually flat pieces of rigid plastic with a rectangular hole in that is fitted into pots and traps to release small shellfish -
F-Cap. (Faithlie Cod Avoidance Panel)
The F-CAP was developed to release cod from a nephrops trawl. -
Fish Stimulation
Fish stimulation being used as a selective device is still a relatively new concept. It is being trialled using a light, sound or electric pulses. -
Gear Operation
This is where there is a complete change of fishing gear or the way the fishing gear is operated to change the catch composition. -
Gear Size
Reducing the physical size of the whole gear or just part of the gear to reduce unwanted by-catch and be able to handle the gear more efficiently. -
Headline Height
A trawl or static net where the gear has been redesigned to keep the headline (top of the net) low to prevent the capture of high swimming species. -
Inclined Netting Grids
An inclined netting grid is a panel of netting fitted inside a trawl and set at an angle. -
Number of Dredges
In some scallop dredge fisheries the number of dredges used is regulated to ensure fishing effort remains within manageable limits. -
Off Bottom Trawl
This is a trawl that, by the way it is rigged and towed, swims clear of the seabed but close enough to target some of the demersal species. -
Ring Size
The ring size of scallop dredges can be used as a selectivity measure to release scallops below a certain size. -
SELTRA Box - Diamond mesh
The SELTRA box is a four panel extension section with a top panel of either large diamond mesh or large square mesh to encourage small fish to escape. -
SELTRA Box - Square mesh panel
The SELTRA box is a four panel extension section with a top panel of either large diamond mesh or large square mesh to encourage small fish to escape. -
Separator panels
A separator panel is a horizontal panel of netting designed to divide the trawl into two sections one above the other. -
Sep-Nep codend
The Sep-Nep is an inclined panel of diamond netting to sieve the nephrops into the lower chamber and direct the fish into the upper chamber. -
Sort X grid
The Sort X grid was developed in Norway as a measure to reduce the numbers of small fish being caught when targeting cod in the Barents Sea. -
Square Mesh Cod-ends
This is one of the most effective escape devices available for the release of small undersized round fish. -
Square Mesh Panels
The square mesh panel is one of the most common used and well known selective devices. -
T90 Cod-ends
In this design the cod-end mesh is turned through 90 degrees into T90 configuration. -
Towing speed
In some situations a change in towing speed can dramatically change the composition of the catch. -
Inclined Separator Panels
An inclined separator panel separates the catch into the bottom living and the higher swimming species and directs them into two separate cod-ends.