Seafood questions ask about cooking or culinary treatment of fish and shellfish, or other foods harvested from lakes, rivers, and oceans.
A wide variety of foods are harvested from the waters of the world, including fish, shellfish, and various kelps and other vegetables. Questions about any of these should be tagged as seafood.
Appropriate questions will ask about how to prepare (clean, cut, or process) or cook these types of food items, or how to improve or fix dishes based on these foods.
Depending on the specific food being asked about, and additional tag such as fish or shellfish may also be appropriate.