Sand launce, also known as sand eel, needlefish, or sand lance, is a small, slender fish commonly found in coastal waters. These fish play an important role in the ecosystem as a key food source for many larger fish, birds, and marine mammals. Sand launce are also popular bait fish for recreational fishing. Other synonyms for sand launce include sandeel, lancefish, greater sandeel, Atlantic sand eel, and Ammodytidae. These names refer to the elongated, needle-like shape and sandy coloration of the fish, as well as its membership in the family Ammodytidae. Sand launce are a fascinating and important part of the marine environment, and their many synonyms reflect their varied uses and importance.