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Organisms which at the harvestable stage, are either immobile on or under the seabed, or are unable to move except in constant physical contact with the seabed or the subsoil.
Square Mesh Panel. A method of improving selection by providing an escape route in the body of the trawl. The diamond mesh in a trawl tends to close when under tension, SMPs incorporated into the extension in this way, can be kept more open over a larger area, and the positioning of these panels can be varied to optimise the escape of juvenile fish.
Spawning Stock Biomass. See stock.