Fattened livers prep white sharks for extreme migrations

Reserves enable long journey from California to Hawaii and back

By Susan Milius, 17:06 PM July 16, 2013

A white shark’s big fat liver, which can plump up to more than a quarter of an animal’s body weight, turns out to be the fuel tank for extreme migrations.

White sharks (Carcharodon carcharias) in the eastern Pacific take a springtime swim from California to Hawaii and return in late summer. A one-way, 4,000-kilometer trip takes about a month.

By combining data from two kinds of tracking tags attached to the animals, an unusual analysis shows that sharks fatten up for the demands of migration mu...

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