👉 A medusan is a type of fish that belongs to the family Loricariidae. This family includes several species, including the Medusa fish (Carcharhinus medusae), which has been described as a deep-sea predator. Medusans are typically found in the ocean depths between 300 and 2,500 meters (10,000 to 8,900 feet) and are known for their distinctive coloration.