As a recreational angler planning to fish in Swedish rivers that flow into the sea, I need to understand the main purpose of the fishing regulations for these areas and identify which authority issues them. Please provide this information.
Navigate to 'Fiske i vattendrag' (Fishing in watercourses) from the homepage. Identify the main purpose of the regulations for fishing in watercourses emptying into the sea. Identify the regulatory authority responsible for these regulations.
State that the main purpose of the regulations for fishing in watercourses emptying into the sea is primarily to regulate fishing for migratory species like salmon, trout, and eel. State that the primary regulatory authority for these regulations is Havs- och vattenmyndigheten (Swedish Agency for Marine and Water Management) and their regulations (FIFS 2004:37).