Taupo is known a one of the world fly fishing Meccas. It is a natural fishery of rainbow and brown trout.  With lots of spawning tributaries and back country rivers to choose from, fly fishing is also a great way to experience some of the beautiful scenery on offer and walk some river tracks.  You can not buy trout to eat in any restaurant - the only way to taste it is to catch it yourself.  Or as do most - catch and release and enjoy watching it swim away.