using large-scale nets.

Selectivity

Gillnets are a series of panels of meshes with a weighted "foot rope" along the bottom, and a headline, to which floats are attached. By altering the ratio of floats to weights, buoyancy changes, and the net can therefore be set to fish at any depth in the water column. In commercial fisheries, the meshes of a gillnet are uniform in size and shape. Fish smaller than the mesh of the net pass through unhindered, while those too large to push their heads through the meshes as far as their gills

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