There’s no question that fly fishing’s premier method for taking squaretails (brook trout) is with a floating fly line and the fly box classic, a dry fly. A gorgeous brook trout like this one can be caught using sinking fly line to dredge the bottom of a pond. Go deep with sinking fly lines (high-density lines) and tie on either a streamer or a nymph. Sure, there are a few stuffy souls out there who pontificate that the use of sinking fly lines is not really fly fishing. Geez, there’s still a fly rod, fly line and a fly involved.