This video says about itself:
17 July 2018
You’re probably familiar with the great white shark, but how much do you know about these other big sharks: blacktip, tiger, sand tiger, Galapagos, and whale? Those are just five of roughly 500 shark species found in our oceans. And they’re doing their part to keep the oceans healthy by keeping fish populations in check.
Band pairs in shark vertebrae have been used for decades to estimate shark age, of practical use in conserving overfished sharks and managing the remaining shark fisheries. However, recent research demonstrates that previous methods used to determine the age of sharks have underestimated those ages, particularly in older sharks: here.