Allan, depending on size, a bead head nymph will catch many different types of fish. I use them for both trout and bluegills all the time. Last summer, I would put a beadhead "birds nest" variation I came up with 1.5 to 2 feet under an indicator (fly fishing term for bobber) and drift it along a weed edge for bluegills. I even caught a few bass up to about 3 pounds doing that!