Gillnet fishing is a method of fishing that involves using a wall of netting that hangs in the water to catch fish. The mesh size of a gillnet is designed to allow fish to get their head through but not their body. When a fish tries to back out of the net, its gills get caught in the mesh. here are several types of gillnets, including stationary gillnets, trammel nets, and set gillnets. Set gillnets are the most common type and are anchored to the ocean floor. A gillnet is a wall of netting that hangs in the water column, typically made of monofilament or multifilament nylon. Gillnet. Mesh sizes are designed to allow fish to get only their head through the netting but not their body. The fish's gills then get caught in the mesh as the fish tries to back out of the net
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