It takes a long time before sharks sleep with the fishes
SHARKS and rays live a lot longer than thought, some twice as long as previously estimated, according to a Queensland study.dy.
Dr Alastairr Harry, of Jamess Cook University,y, researched 53 3 different popu- lations of sharks s and rays and discovered that a grey nurse shark k can live up to 40 0 years – twice as s long as had been estimated.ti td
“And the age of New Zealand porbeagle sharks had been underestimated by an average of 22 years,” he said. “Across the cases I studied, age was underestimated by an average of 18 years and up to 34 years in one instance.” Scientists usua ally measure a sh shark’s age by countingc the rings in their vertebrae. Dr Harry said thatth errors in calculationsc appearedp to have occurredo due to growthg rings ceasingceasin to form or becoming unreliable beyond a certain size or age. Age calculation is important for the management of marine resources.
ACTION: Jaiden Johnstone and Tia Boyd-Long settle in; and (left) Brisbane’s grand old Regent Theatre. Picture: Peter Wallis