Researchers in Canada found out that overfishing caused sharks and rays to drop by 71% since 1970

“More than three-quarters of all species are at risk of extinction” A study found that sharks and stingrays in the world's seas have plunged by 71% since 1970 due to overfishing. It was also pointed out that more than three-quarters of all shark and stingray species are at risk of extinction. A research team led by Professor Nick Dulby from the Department of Biological Sciences at Simon Fraser University in Canada (SFU) measured the relative populations of 18 shark and stingray species from 1970 to 2018, and evaluated the risk of extinction of a total of 31 species, published in the scientific journal Nature. did. According to Nature and foreign media, there have been several studies showing that sharks and rays are decreasing, but most were limited to specific sea areas, and none showed the overall flow like this. The research team analyzed using the Earth Life Index (LPI) and the Red List Index (RLI), two measures that have been used to check the implementation of the'Aichi ...