I'm relatively new to fly fishing and started to read a book called "Streamer-Fly Fishing", it's an older book put out in 1991. Reading thru it, I learned a lot about streamer fishing, how streamers are fished and if done correctly it'll catch some nice fish. It mentioned that young fish start off by feeding on insects and then transition over to bait fish and sculpins which streamers attempt to imitate. It also stated that once fish transitioned over to bait fish and sculpins that it allowed the fish to grow much larger as a result. The book also gave me the impression that some fishermen are fishing streamers exclusively. I wanted to find out how others feel about streamers and if there are some people that fish streamers exclusively or only as a supplement along with dry flies. Can streamers be productively used year round or just seasonally when the hatch is off..?