A trawl fishing vessel is a type of fishing boat that uses a large, cone-shaped net called a trawl to catch fish. The net is dragged through the water or along the ocean floor behind the boat, catching fish as it goes. Trawlers can vary in size and design, but typically have a large deck area for working with the net, winches and cables to tow the net, and storage areas for the catch. Trawlers can be further classified based on the type of net, number of nets, and where it's being used in the water