area swept
In reference to a demersal trawl, it is the area of the sea floor over which the net is dragged during its operation, and is estimated by multiplying the width of the net mouth by the distance the net is dragged. From data on the densities of fish caught in a unit area swept, an estimate of the biomass in that part of the sea can be obtained.

Fisheries — dictionary. . 2004.

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