Great white sharks are a species that is listed as “vulnerable” by the World Conservation Union, and it seems their population is decreasing. However, it is unclear how many sharks there actually are.
Researchers trying to discern how many sharks live in the waters near California had to stay on boats in the Pacific, luring sharks close with a seal-shaped decoy so that they could take photos. They identified specific sharks by the shape of their dorsal fin. Out of 321 photos, they found 131 unique sharks; they used “statistical methods” to determine that there are around 219 of the sharks in that region.
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