To fish a bucktail jig in saltwater, cast it out and let it sink to the desired depth. Then, retrieve it with a steady and jigging motion, keeping it near the bottom. Vary the speed and depth of your retrieve to imitate the movement of prey and attract strikes from fish. Bucktail jigs are effective for a variety of species such as striped bass, flounder, and bluefish. Experiment with different colors and sizes to find the most successful combination for your fishing conditions. Remember to use a suitable rod and reel setup for saltwater fishing and always check local regulations for size limits and catch restrictions.