Laws and regulations managing angling vary greatly, often regionally, within countries. These commonly include permits (licences), closed periods (seasons) where specific species are unavailable for harvest, restrictions on gear types, and quotas.
Laws generally prohibit catching fish with hooks other than in the mouth (foul hooking, “snagging” or “jagging”[2]) or the use of nets other than as an aid in landing a captured fish. Some species, such as bait fish, may be taken with nets, and a few for food. Sometimes, (non-sport) fish are considered of lesser value and it may be permissible to take them by methods like snagging, bow and arrow, or spear. None of these techniques fall under the definition of angling since they do not rely upon the use of a hook and line.

Fishing seasons
Fishing seasons are set by countries or localities to indicate what kinds of fish may be caught during sport fishing (also known as angling) for a certain period of time. Fishing seasons are enforced to maintain ecological balance and to protect species of fish during their spawning period during which they are easier to catch.

Slot limits
Slot limits are put in action to help protect certain fish in given area. They generally require anglers to release captured fish if they fall within a given size range, allowing anglers to keep only smaller or larger fish.[3][4] Slot Limits vary from lake to lake depending on what local officials believe would produce the best outcome for managing fish populations.