The term 'ONE WITH NET GAINS' can be solved by the six-letter word 'SEINER'. A seiner is a type of fishing boat used to catch fish in a NET. It is typically used for salmon fishing in the North Pacific and is also known as a purse seine. The boat is equipped WITH a large NET that is deployed around a school of fish, which is then drawn closed at the bottom like a purse. This method of fishing is very effective and results in NET gains for the fisherman.