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New study finds extreme longevity in white sharks
Date:1/9/2014

Great white sharkstop predators throughout the world's oceangrow much slower and live significantly longer than previously thought, according to a new study led by the Woods Hole Oceanographic Institution (WHOI).

In the first successful radiocarbon age validation study for adult white sharks, researchers analyzed vertebrae from four females and four males from the northwestern Atlantic Ocean. Age estimates were up to 73 years old for the largest male and 40 years old for the largest female.

"Our results dramatically extend the maximum age and longevity of white sharks compared to earlier studies," said Li Ling Hamady, MIT/WHOI Joint Program student and lead author of the study published in PLOS ONE. "Understanding longevity of the species, growth rate, age at sexual maturity, and differences in growth between males and females are especially important for sustainable management and conservation efforts."

Age determination in fish relies primarily on analyzing growth increments in mineralized tissue, such as otoliths (ear bones), vertebrae, and fin rays. These grow throughout a fish's life, adding annual rings, similar to growth rings in trees.

Estimating age in white sharks can be challenging. While vertebrae are constructed of layers of tissue, laid down sequentially over an individual's lifetime, the alternating light/dark banding patterns can be narrow and less distinct than in other species, and the bands don't necessarily signify annual growth.

"Traditionally, ageing sharks has relied on the assumption that band pairs are annual. In many cases this has been proven correct for part or all of a species life, however in more and more cases this is being disproven," said coauthor Lisa Natanson, a fisheries biologist at NOAA's Northeast Fisheries Science Center (NEFSC) lab in Narragansett, R.I.

In previous studies, which assumed annual deposition of growth bands, the oldest white shark individuals
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media@whoi.edu
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Woods Hole Oceanographic Institution
Source:Eurekalert

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