Particularly the leave campaign, under international law every country is allowed to control 200 miles off their coast for fishing/oil etc. Being in the EU means we have to open our fishing waters to the entire EU & other nations are given a quota of our fish.
The UK has 70% of all EU fishing stocks but we are only given 13% of the catch by the EU, we are effectively giving away billions of pounds of resources to other EU nations. If we leave the EU we would regain control of our fishing waters, this means we could create thousands of jobs, billions in tax income & create UK industry particularly in UK coastal areas. Iceland, Greenland & Norway refused to join the EU because of the issue of fishing & refused to give their fishing waters away