Woolly Worm Black - Worm. The Black Woolly Worm has such deadly capabilities that it can feel like you are cheating, this fly is as dangerous to fish as is dynamite. This fly is the benchmark to all buggers and leeches, and the results it provides demonstrates this completely. The Wooly Worm Black can be used to catch every freshwater fish imaginable, going from pan fish like the blue gill and small and large mouth bass, to carp and catfish, and obviously trout and salmon absolutely adore this fly.