I am not sure about deep fishing. What I know is that a license for fishing, or fishing permit, acts as a mechanism used to control fishing
A fishing license is basically a mechanism to control fishing.  My husband and daughter went to fish at the beach in Florida and we did have to have a salt-water fishing license on top of their fresh-water one.
I love fishing I just wish I could be better at it There are different techniques such as spearing, netting, angling and trapping - do you do any of those? No i just do angling but my dad has used a net in the past! I see, did you know that there are a lot of fish farmers and fishermen out there ? According to statistics there are about 38 million I had no idea they had that many! Is it true for deep sea fishing you need a special licenses .
A fishing license (US), fishing licence or fishing permit is a regulatory or legal mechanism to control fishing.