The Bitch Creek is a great stonefly pattern that can be effective throughout the world on trout rivers. This pattern looks remarkably similar to most stoneflies found in trout rivers. This nymph can produce quality fish all year long but the spring and fall months seem to be the best. The Bitch Creek is a great prospecting trout fly as well, so when in doubt tie one on and get fishing. An all-around great fly for trout fisherman to have.