Selective harvest means that you keep what you will use and release the remainder of your catch unharmed. If a fish that is legal is bleeding from the gills or showing signs of undue stress, kill it and keep it as part of your bag limit. Because of size or bag limits, you may not be able to keep some fish that you think may die. Use tackle and lures that minimize the chance of injury to fish if you intend to release your catch. Avoid using bait if you are catching too many fish.
Fish usually take bait more deeply than lures or flies.
As you near the number of fish you can use and you want to keep fishing, switch to less effective tackle.