Nocturnal fish, such as the BIGEYE, are fish that are active during the night and sleep during the day. BIGEYE is a type of nocturnal fish that is found in tropical and subtropical waters around the world. It is a deep-sea fish that can reach lengths of up to 60 cm and is characterized by its large eyes, which help it to see in the dark. BIGEYE is an important commercial species, with its flesh being used for human consumption and its oil being used for industrial purposes.