OSLO/COPENHAGEN—Norway, Britain, and the European Union have reached a trilateral deal on catch limits for jointly managed North Sea fish stocks following the UK’s exit from the EU, the three parties said on Tuesday. The new trilateral deal, covering common North Sea fishing quotas for cod, haddock, plaice, whiting, herring, and saithe, is the first step toward ending legal havoc in key fishing waters since Britain completed its exit from the EU on Dec. 31. British Fisheries Minister Victoria Prentis said that while the new accord covers common North Sea quotas, bilateral talks were underway with the EU, Norway, and the Faroe Islands to confirm access arrangements and fish quota exchanges. British, Danish, German, Swedish, and French vessels all catch fish in the Norwegian part of the North Sea, home to some of the richest fishing stocks in Europe. Norway had sought a trilateral pact with Britain and the EU …