Sea fish are a diverse group of aquatic creatures that inhabit the world's oceans. HALIBUT, a flatfish found in the North Atlantic and Pacific Oceans, is a popular sea fish with seven letters. DORY, a small, blue-colored fish found in the Indian and Pacific Oceans, has four letters. BASS, a type of freshwater and saltwater fish found in temperate climates, also has four letters. Lastly, boce, a type of eel found in the Mediterranean Sea, also has four letters.