Who can fish commercially, who can buy and sell first-sale fish, how to report sales information.
If you want to fish commercially and sell your fish you may be subject to regulations depending on your fishing method. If you are fishing recreationally or using a charter vessel you are also subject restrictions on selling your catch.
If you want to purchase fish you may need to register and submit sales information to the fisheries authority. The Marine Management Organisation (MMO) registers buyers and sellers operating in England.