A Third of the Spaniards of Shark and Ray Could Cope with Extinction
A third of the shark and brother -in -law species are on the verge of extinction until almost extinct, according to an eight -year scientific study.
“Sharks and rays are the canary of the overfished coal mine. If I tell you that three-quarters of tropical and subtropical coastal species are endangered, just imagine a David Attenborough series that lost 75 percent of its predators. If sharks are declining, there is a serious problem with fishing, ”said lead author of the paper Nicholas Dulvy, of Simon Fraser University in Canada.
The health of “entire marine ecosystems” and food security are at stake, said Dulvy, who is a co-chairman of the shark specialist group at International Union for Conservation of Nature (IUCN).
The number of shark, ray, and chimaera species, known as chondrichthyan fish, facing “a global crisis” has more than doubled in less than a decade, according to the newspaper published on Sept. 6 in the journal. Current Biology.
Rays were the most endangered, with 41 percent of the 611 species studied being at risk; 36 percent of the 536 shark species are endangered; and 9 percent of the 52 chimaera species.
Dulvy says: “Our study reveals an even more dire reality, that these species now make up one of the most endangered vertebrate lines, second only to amphibians in the dangers they confronted. “
“Widespread depletion of fish, especially sharks and rays, threatens the health of the entire marine ecosystem and food security for many countries around the world,” he said.
The assessment is the second to be implemented since 2014, and it comes after a January study found The shark and ray populations have fallen by more than 70 percent in the past 50 years, which once had widespread species such as the hammerhead shark facing extinction.
Sharks, rays, and chimaera are vulnerable to overfishing because they grow slowly and have few children. It’s done estimated that 100 million sharks are killed by humans each year, underscoring their slow breeding capacity. Fishing is a “significant threat” to chondrichthyans, alone or in combination with other fishing, according to the authors.
Most sharks and rays are taken “unintentionally,” but they can be “unofficial targets” in many fisheries, the report said, and kept for food and animal feed. Habitat loss and degradation, the climate crisis, and overfishing are pollution, the authors say.
Disproportionately endangered species in tropical and subtropical waters, especially countries such as Indonesia and India, experts have found, are due to very high demand from large coastal populations along with the majority that do not ‘ y fisheries regulation, which is often driven by the demand for higher value products such as fins.
Chondrichthyans have survived at least five killings in their 420 million -year history, the report agreed. However, at least three species are now endangered and possibly extinct. The Java stingaree has not been recorded since 1868, the Red Sea torpedo ray from 1898, and the extinct shark in the South China Sea has not been seen since 1934. Their extinction is the first time in the world that marine species have disappeared. that is due to overfishing.
Colin Simpfendorfer, an adjunct professor at James Cook University in Queensland, Australia, says: that remains poor management, despite countless commitments to improve.
“As a result, we fear that we will soon be able to confirm that one or more of these species have been displaced by overfishing – one that has previously disturbed marine fish,” he said. “We will work to make this study a point in efforts to avoid any irreversible loss and ensure sustainable continuity.”