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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. -
Technical Information