A trawler is a fishing boat designed for the purpose of operating a trawl, a type of fishing net that is dragged along the underneath of the sea (or sometimes above the bottom at a specified depth).
A trawler can also refer to a cruising trawler which is a recreational boat as it resembles a fishing trawler.
Modern "rock hopper" nets have heavy rubber wheels that allow the net move slowly over rough ocean bottoms without tearing on rocks.
Sailing trawlers can trawl at depths of 55-75 metres, but modern trawlers can often trawl to 900 metres. Sizes of modern trawlers vary from 2,500 to 3,000 tons.
Fishing trawler,made up of wood was invented in Brixham(in England) in 19th century, which is the largest port in the South-West .