Ocean fishes are a diverse group of aquatic creatures that inhabit the world's oceans. Cods, which have four letters, are a type of fish found in the Atlantic and Arctic Oceans. They are an important food source for many cultures and are also commercially fished. Cods are usually found near the bottom of the ocean and can grow up to six feet in length. They have a thick, slimy skin and are characterized by their large mouths and two dorsal fins.