Massive school of striped catfish congregate on a sandy ocean floor, forming a dense, dark mass that contrasts with the light blue water and white sand, creating a captivating underwater scene

ocean underwater seabed sand school fish catfish striped catfish marine life aquatic nature wildlife ecosystem habitat congregation gathering abundance density contrast pattern stripes movement swarm shoal aggregation behavior instinct survival natural light clarity depth perspective tranquility serenity beauty wonder awe diversity marine ecosystem aquatic environment underwater world fish species catfish behavior schooling behavior underwater landscape seascape marine biology zoology red sea