Yes. Freshwater and saltwater fly fishing can be done on the same rod. But you'll need to replace the freshwater hooks with saltwater hooks and lines, and you may want to add some backing to your reel. Fly fishing rods designed for saltwater are typically made of different materials than regular fishing rods, and they have been specifically designed to resist corrosion and handle the higher levels of drag that salt water can cause. However, if you are using a regular fishing rod in salt water, it is important to make sure it is properly seasoned beforehand.