With Trout I usually catch and release so most of the time I reach down with my releaser (Ketchum Release, Runje Releaser, etc) and flick the fish loose without removing from the water or touching. With some of the other fish such as Bass or Catfish, I lip them by grabbing their prominent lip and cradle thier bellies with the other hand while the rod goes underarm. With some such as Carp, I use a net while with most Saltwater I use a Boga Grip to avoid teeth, spines and gill plates.