I beg to differ with Mr. Cook.
The idea of catch and release is a "feel good" thing but it often results in the death of the fish that is released - more often than not in fact. For example some fish (bass, trout, etc, will virtually inhale the hook and it will lodge deep in the fish and cause a great deal of internal damage as the fish is reeled in. Even if the angler does not lift the fish out of the water (and most do for the photo op, etc) the fish is often still mortally wounded. In general, even if the fish is just hooked in the mouth, if an angler lifts the fish out of the water, it is not going to be a successful catch and release.
In other species, for example the mythical trout in the clear mountain stream, the fish may expend so much energy being caught that even if not injured by the hook it starts a slow downhill decline ending in death as that clear moutain stream is the aquatic version of a desert and the fish is living on the edge already. The stress and energy expended in getting caught draws on reserves the fish cannot afford to spare.
Once a fish ends up in a live well or a creel, it is as good as dead, but again many fishermen will cull their catch to stay at the limit while turning smaller fish loose as they catch larger ones, resulting in the death of each and every one of them. When I worked as a GF&P officer, I would frequently find the bottom littered with dead fish that were victims of "catch and release" fishing. I am not a believer in catch and release as a mangement tool unless it is done with unbarbed hooks by fishermen properly trained in how to do it correctly. And as part of the management strategy you still need to assume a fair level of mortality when you are deciding how much fishing pressure can be sustained and/or how much restocking needs to occur.
In that regard spearfishing is just a lot more honest, you know when you take aim that you are going to kill it, so there are none of the warm and fuzzy catch and release fantasies that result hook and line fishermen killing far more than the legal limit.
That said, back in the day when large carp were common, I used to see large (20-40 lbs) carp with multiple scars up high on the back (above the vital organs) from old spearfishing wounds by divers who would spear them then release them. Some fish can be a lot tougher than they look when it is a flesh would rather than an internal injury.