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Tiger sharks migrate like birds

created on: 10.06.2015 | by: Jürgen Oeder | Category(s): News, Umwelt

The tracked sharks followed the same migration pattern each year and returned to almost the same small area in the Caribbean each time. There, the males will find female tiger sharks and mate. But why they travel so far north is still an open question. – May be it is just food. Tiger sharks are coastal species – wrong! They migrate like birds and undertake round-trip journeys longer than 7,500 kilometers long every year as a new satellite tagging study proves. The study, reported in the June 9 issue of the journal Scientific Reports, reveals previously unknown migration patterns between two different regions, the coral reefs of the Caribbean where adult male tiger sharks spent the winter and the open waters of the mid-North Atlantic in the summer. Furthermore, the predators reliably returned to the same wintering areas each year, as the three-year satellite tagging shows Migrating tiger sharks are returning to almost the same area. Courtesy Nova SouthEastern Univeristy The tags the scientists attached to tiger sharks near Bermuda lasted up to three years. One shark named Harry, traveled more than 44,000 kilometers in this time. The tracked sharks followed the same migration pattern each year and returned to  the same approximate small area in the Caribbean each time. There, the males find female tiger sharks and mate. But why they travel so far north is still an open question. Maybe it is just for feeding. The migration pattern, similar to that of white sharks in the northern Pacific, might be helpful for conservation. Tiger sharks nearly have the status of threatened, because they are targeted for the soup fin trade. You can find more about the biology of sharks in my e-book, available as an app. See: www.ultimatefishingbooks.com Source: James S. E. Lea, Bradley M. Wetherbee et al: Repeated, long-distance migrations by a philopatric predator targeting highly contrasting ecosystems, in: Scientific Reports 5,