An 18-foot long oarfish washed ashore at Catalina Island over the weekend. It took 15 adults to carry it up the beach to get a better look. Catalina Island Marine Institute instructors say it appears the fish died naturally. Biologists say the giant oarfish is the longest bony fish species, topping at around 56 feet. They are also thought to be responsible for sea serpent sightings throughout history.