TECHNOLOGY

One-third of shark and ray species may face extinction


This story is basically To be published Guardian And part of it Climate desk Collaboration.

Eight years of scientific research have shown that one-third of sharks and rays are close to extinction.

“Sharks and rays are canaries in extra fishing coal mines. If I were to tell you that three-quarters of tropical and subtropical coastal species are threatened, just imagine that 75 percent of the David Attenborough series of predators are gone. If sharks are declining, there is a serious problem with fishing, ”said Nicholas Dulvi, lead author of the paper at Simon Fraser University in Canada.

“The health and food security of the entire oceanic ecosystem is at stake,” said Dulvi, a former vice president of the sharks expert group at the International Union for Conservation of Nature (IUCN).

The number of shark, ray and chimera species, known as chondrichian fish, has more than doubled in less than a decade, according to a September 6 study published in the journal Current Biology.

The ray is most endangered as the Ays11 species is at 411 percent risk; Of the 536 shark species, 36 percent are at risk; And 9 percent of the 52 chimera species.

Dulvi said: “Our research reveals an increasingly frightening reality that these species are now one of the most endangered vertebrates, second only to amphibians in their endangerment.”

“The massive depletion of these fish, especially sharks and beetles, threatens the health of the entire marine ecosystem and the food security of many countries around the world,” he said.

The second was evaluated from 2014 to 2014, and a study in January found that sharks and rabbits have become more than 100 percent extinct in the last 50 years, before widespread species such as hammerhead sharks became extinct.

Sharks, rabbits and chimpanzees are at risk for overfishing because they grow slowly and few babies are born. It is estimated that 100 million sharks are killed by humans each year, overshadowing their slow reproductive capacity. The author says the artist fishing was a “major threat” to the Chandrichathians, either by themselves or in conjunction with other fishermen.

Most sharks and rabbits are taken “unintentionally”, but in many fisheries these can be “unofficial targets,” the report said, and it has been retained for food and animal feed. Habitat loss and degradation, climate crisis, and pollution compound excess fishing, the authors say.

Species are unequally threatened in tropical and subtropical waters, especially in countries such as Indonesia and India, experts say, because much of the demand for large coastal populations is combined with uncontrolled fish farming, often driven by high-value commodity demand.

The Chandrichthians have survived at least five mass extinctions in their 420 million-year history, the report said. But, at least three species are now critically endangered and possibly extinct. The Java Stingari has not been recorded since 1868, the Red Sea torpedo ray since 1898, and the lost shark in the South China Sea since 1934. For the first time in their disappearing world, marine species have become extinct because of overfishing

Colin Simpendfer, an assistant professor at James Cook University in Queensland, Australia, said:

“As a result, we fear that we will soon confirm that one or more of these species have become extinct due to overfishing – a first of deep concern for marine fish.” “We will work to make this study a turning point in efforts to prevent further irreversible damage and maintain long-term sustainability.”



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