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Dead sabre fish. Close-up of the eyes of two dead sabre fish, or ribbon fish (Trichiurus lepturus). Two old fishing boats are seen in the background. Sabre fish inhabit deep coastal waters and estuaries. They feed on other fish, crustaceans, squid and plankton. They may reach a length of up to 150 centimetres. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR. JOHN BRACKENBURY)