Have you ever been to Fly fishing, when you use fly to catch a fish?
No, I've personally never been a fan of fishing. Haven't watched or tried anything since I was little.
It can be done in fresh or salt water. I prefer fresh water, Nature is more beautiful near rivers and lakes. 
Nature is indeed very beautiful. Very calming in those areas.  
I was fishing in St. Johns River last year, it is the longest river in the U.S. state of Florida
Only place I've ever tried fishing(When I was little) was at the Hillsborough State park
Fly fishing
Fly fishing is an angling method that uses a light-weight lure -- called an artificial fly -- to catch fish. The fly is cast using a fly rod, reel, and specialized weighted line. The light weight requires casting techniques significantly different from other forms of casting. The flies may resemble natural invertebrates, baitfish, or other food organisms.
Fly fishing can be done in fresh or salt water. North Americans usually distinguish freshwater fishing between cold-water species (trout, salmon, steelhead)
Centerpin fishing
Centerpin fishing, also called float fishing or center pin fishing, is a fishing technique which uses a centerpin rod, a centerpin reel, and Roe, or an artificial fly. The method is used for steelhead fishing in fresh water, and is currently popular with freshwater salmon anglers who drift floats downstream.
References.
- Gross WH (2008) "Steelhead & Salmon: Use the Secrets of the Pros to Catch More and Bigger Fish" Lyons Press Series.
- McClane AJ and Gardner K