The IUCN also lists ten fish subspecies as endangered. Sue Flood/The Image Bank/Getty Images. Swordfish feed on a variety of fish and invertebrates such as squid. They tend to migrate a great deal in order to find food and to be able to stay in warmer areas of water. It is possible but for now swordfish are not listed as an endangered species. The Swordfish is found in oceans around the world. Swordfish reach sexual maturity between 5-6 years of age and live up to 9 years. Swordfish Distribution. To reduce the risk of mercury contamination, avoid eating swordfish, shark, tilefish and king mackerel altogether. The report by the International Union for Conservation of Nature lists 32,000 species as threatened with extinction, including the European hamster and North Atlantic right whale. Swordfish are elongated, round-bodied, and lose all teeth and scales by adulthood. Of the subpopulations of fishes evaluated by the IUCN, 24 species subpopulations have been assessed as endangered. Swordfish, known scientifically as Xiphias gladius, are not endangered. Swordfish have been observed spawning in the Atlantic ocean at 75 m deep. Most swordfish are caught with longlines, which have high bycatch of juvenile billfish, sea turtles, seabirds and sharks. 01 of 06. They capture their prey by slashing their bills back and forth, stunning or injuring the prey in the process. Swordfish is not listed as an endangered species. 4.2% of all evaluated fish species are listed as endangered. Swordfish live for about 9 years. They are a popular sport fish of the billfish category, though elusive. As of September 2016, the International Union for Conservation of Nature (IUCN) lists 643 endangered fish species. Limit your intake of white tuna (also known as albacore) to less than 6 ounces per week. Swordfish are caught on longlines that also catch endangered wildlife, such as turtles, seabirds, whales and dolphins. Here is a list of some especially endangered seafood along with some sustainable alternatives. There are some exceptions noted, as well, in which an otherwise threatened fish is being caught sustainably somewhere. Although the U.S. has imposed strict regulations in the Pacific to reduce bycatch of endangered sea turtles, foreign fleets are not subject to these restrictions, and there is no international management for swordfish in the Pacific. Swordfish (Xiphias gladius), also known as broadbills in some countries, are large, highly migratory, predatory fish characterized by a long, flat, pointed bill. The majority of them though are found in the Pacific Ocean. Little is known about the reproductive behavior of swordfish except that spawning tends to occur in warmer waters year round and during the spring and summer months in cooler regions. Bluefin Tuna . 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