The UK’s share of the overall EU fishing catch grew between 2004 and 2014. In 2004 the UK had the fourth largest catch of any EU country at 652,000 tonnes, by 2014 this had grown to 752,000 tonnes and the second largest catch of any country in the EU.
Oh, so British fishing isn't in decline? Great news. Problem solved. Point to random figures off some random site, and ignore actual fishermen who were protesting as we built up to the referendum.

I'm literally going to bed. I'll give those figures the benefit of the doubt for now and dig tomorrow, What I'd ask now is this... how much of the EU's marine territory is British? How much is our share relative to this figure? If we cut loose, will our fishing haul go up, or down? Then you can tell me if there's anything to be gained for the fishing industry in the UK by leaving the EU.