The UK Government has introduced to the UK House of Commons the Fisheries Bill (Bill 278), its first reading being held 25 October 2018. As summarized in the Explanatory Notes (para. 1), “[t]he Fisheries Bill (the Bill) will provide the legal framework for the United Kingdom to operate as an independent coastal state under the United Nations Convention on the Law of the Sea 1982 (UNCLOS) after the UK has left the European Union (EU) and the Common Fisheries Policy (the CFP)”.
For more information see the Fisheries Bill (as introduced), Explanatory Notes, Delegated Powers Memorandum and press release.