That is because fishing has multiple other factors. For one, it is a major component of certain towns and villages, so while it isn't important to big cities, it is on the smaller scale in particular areas. It keeps harbours open and is also a draw for tourists, so I would say it has different implications than, say, shoe manufacturing.

The British chocolate industry was a major employer in some places but has been decimated. British chocolate was certainly not the best in the world but it was better than what it has been turned into in the last few years, thanks to palm oil, international take overs etc.