Bóias, net buoys

Trawling is a method of fishing that involves pulling a fishing net through the water behind one or more boats. The net used for trawling is called a trawl net. The method requires bag nets to be towed through the water to catch different species of fish or sometimes a target species.
The boats used for trawling are called trawlers or trawlers. Trawlers range in size from small open boats with engines up to 30 hp (22kW) to large factory boats with over 10,000hp (7.5 MW).