Gigantic tubeworms and mussels thrive in densities of up to 65 pounds per square foot around vents. The oarfish, Regalecus glesne, is the longest bony fish in the world. Green turtles can migrate more than 1,400 miles to lay their eggs. A group of herring is called a seige. A group of jelly fish is called a smack.
Many fish can change sex during the course of their lives.
Others, especially rare deep-sea fish, have both male and female sex organs. Oils from the orange roughy, Hoplostethus atlanticus, a deep-sea fish from New Zealand, are used in making shampoo. Bluefin tuna, Thunnus thynnus, are among the largest and fastest marine fish. An adult may weigh 1,500 pounds and swim up to 55 miles per hour. Since the architecture and chemistry of coral are very close to human bone, coral has been used to replace bone grafts in helping human bones to heal quickly and cleanly.