Myxine, also known as hagfish, is an eel-shaped jawless fish that is usually found in deep ocean waters. Synonyms for myxine include slime eels, sea rats, and snot eels, due to their slimy secretions when threatened. They are also referred to as blind eels because of their lack of eyes, and blood eels because they secrete a protein similar to haemoglobin that turns the surrounding water into a slimy substance when cut. Hagfish, their more commonly used name, originates from the Old Norse word "hakkefisk", which translates to "hook fish". Despite their unappealing traits, hagfish have been used for various purposes including food, leather products, and biomedical research.