Whale sharks bigger than we thought, can live to 130 years old
Whale sharks, the largest of the shark species, can travel the ocean for up to 130 years and can grow as long as 61 feet.
That’s according to a recently released study by researchers at Nova Southeastern University’s Guy Harvey Research Institute and the Maldives Whale Shark Research Programme, a non-profit whale shark research group.
The study, published online this month in the Marine and Freshwater Research Journal, followed free-swimming sharks who returned to the same area every one to two years in the South Ari Atoll, Maldives over a 10-year period
The research found that whale sharks can grow as long as 61.7 feet on average — “longer and bigger than previously believed.” The measurements were based on 186 encounters with 44 sharks that were measured visually and with laser and tape. Previously, whale sharks were generally believed to be 40 feet long or more.
“What makes this a novel approach is that we took repeated noninvasive underwater measurements of live sharks over the course of a decade,” said Cameron Perry, one of the study’s authors and a former graduate student at NSU in Davie.
“Up to now, such aging and growth research has required obtaining vertebrae from dead whale sharks and counting growth rings, analogous to counting tree rings, to determine age,” Perry added. “Our work shows that we can obtain age and growth information without relying on dead sharks captured in fisheries. That is a big deal.”
Researchers said they were able to recognize the returning sharks because of their unique patterns of spots.
Whale sharks are plankton-eaters and can weigh about 20 tons. The gentle giants are generally harmless to humans who have spotted them on occasion off the coasts of South Florida.