The origin of this story Appeared in The Guardian And is part of Climate desk Collaboration.
One-third of the shark and ray species are on the verge of extinction, according to an eight-year scientific study.
“Overfishing coal mines have sharks and rays. If I tell you that three-quarters of the tropical and subtropical coastal species are endangered, just imagine the David Attenborough range where 75 percent of its predators are gone. If sharks are declining, fishing is a serious problem, ”said Nicholas Dulvi, lead author at Simon Fraser University in Canada.
“The entire ocean ecosystem” and food security are at risk, said Dulvi, a former co-chair of the International Union for Conservation of Nature’s (IUCN) shark expert group.
According to a Sept. 6 paper in the journal, the number of shark, ray, and chimera species known as the “Chondrichian fish” facing the “global extinction crisis” has doubled in less than a decade. Current Biology.
The rays are the most dangerous, with 41 percent of the 611 species being studied as endangered; Of the 536 shark species, 36 percent are endangered; And 9 percent of the 52 species of Chimera.
Dulvi said: “Our study reveals an increasingly grim reality that these species are now one of the most endangered vertebrates, second only to the endangers they face after amphibians.”
“These fish, especially sharks and the widespread depletion of rays, endanger the entire ocean ecosystems and food security for many countries around the world,” he said.
This assessment is the second to be done since 2014, and it came after a study in January found that sharks and reptiles had lost more than 70 percent of their population in the last 50 years, before widespread species such as hammerhead sharks became extinct.
Sharks, rays and chimeras are susceptible to overfishing as they grow slowly and produce little young. It is estimated that 100 million sharks are killed by humans each year, increasing their slow reproductive capacity. The authors said that ond industrial fishing was a “key threat” to Chondrichyan, either in combination with manual or other fishing.
Most sharks and rays are taken “inadvertently”, but they can be an “unofficial target” in many fisheries, the report said, and are retained for food and animal feed. Habitat loss and degradation, climate crisis and pollution combination overfishing, the authors said.
Species in tropical and subtropical waters are disproportionately endangered, especially in countries such as Indonesia and India, experts have found, because of the high demand of large coastal populations associated with most unregulated fishing, often due to high demand for high value products.
According to the report, Chondrichthyans have survived at least five mass extinctions in their 420 million year history. But, at least three species are now seriously endangered and possibly extinct. The Java Stingary has not been recorded since 1868, the Red Sea torpedo ray since 1898, and the lost shark of the South China Sea since 1934. Their disappearance will be the first time in the world that marine species have become extinct.
Colin Simpfendorf, an assistant professor at James Cook University in Queensland, Australia, said: Remain powered by
“As a result, we fear that we will soon confirm that one or more of these species have led to extinction from overfishing – the first of the most worrying for marine fish.” “We will work to make this study a turning point in efforts to prevent further reversible damage and secure long-term sustainability.”