The fish can swim away appearing healthy only to later perish. This is critical, after landing your catch this is proven to be the most effective way to quickly remove the hook, and quickly returning the fish to the water. It also makes it easier to get the hook out of the fisherman should things not go as planned. I think you'll find that if you keep a tight line and contact with the fish, you will not lose fish as a result of barbless hooks. You may also find that you get deeper hook penetration without the barb.
Single hooks are also a good idea.
Through the years I've used single hooks on all my spinning lures and have noticed no difference in the ability to hook fish. I do know that single hooks cause far less damage to the fish, greatly increasing their chances for a clean release and their survival. With a little practice and a good pair of forceps you can with a twist of the wrist remove a barbless hook without touching the fish or removing it from the water. If using a landing net the soft mesh bag type is the way to go, with the new rubber net type being better yet. The hard nylon nets will harm fish, and should be avoided.