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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.

Selective device
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.

Selective device
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.

Selective device
Separator panels

A separator panel is a horizontal panel of netting designed to divide the trawl into two sections one above the other.

Selective device
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.

Selective device
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.

Selective device
Square Mesh Cod-ends

This is one of the most effective escape devices available for the release of small undersized round fish.

Selective device
Square Mesh Panels

The square mesh panel is one of the most common used and well known selective devices.

Selective device
T90 Cod-ends

In this design the cod-end mesh is turned through 90 degrees into T90 configuration.

Selective device
Towing speed

In some situations a change in towing speed can dramatically change the composition of the catch.

Selective device
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.

Selective device
Technical Information

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