More than a third of shark species threatened with extinction


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Excessive fishing and climate change are primary causes, researchers conclude

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According to the International Union for Conservation of Nature (IUCN), more than a third of the world’s sharks and rays are at risk of extinction.

In a report released earlier this month, the group said the damage is mainly due to over-fishing and compounded by ocean pollution and climate change.


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“Today’s IUCN Red List update also includes a comprehensive re-evaluation of the world’s shark and ray species, revealing that 37% are now at risk of extinction, indicating that most of the world’s oceans lack effective management measures. Is,” the report said. “All threatened shark and ray species are extirpated, 31% affected by further habitat loss and degradation and 10% by climate change.”

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“We are pleased to see the re-evaluation of sharks and rays,” said Ameer Nick Lughadha, senior research leader in conservation assessment and analysis at the Royal Botanic Gardens, Kew. “Comprehensive re-evaluation of ecologically important groups is critical to maintaining the Red List’s value as a barometer of life. We note the striking similarity between shark and ray statistics and recent estimates for plants: in 5 About 2% are threatened with extinction and habitat loss. Loss and degradation present a more immediate threat than climate change.”

The IUCN Red List of Threatened Species includes 138,374 species, of which 38,543 are on the verge of extinction.

The update was preceded by new research published in the journal current biology who c. analyzed about 1,200 species ofhondrichthis, a group of fish including sharks and rays, 32% of which were considered “vulnerable”, “endangered” or “critically endangered”.

“This figure rises to more than a third (37.5%) if lack of data According to the IUCN SSC Shark Expert Group, the species is considered threatened in the same proportion as it has been assessed Said in a post after the news.

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“This second global assessment of chondrichthian fishes found twice the species found in the first analysis in 2014 (181). Chondrichthians now rank second among vertebrates (after amphibians) in terms of extinction risk. “

Chondrichthyes have lived on Earth for hundreds of millions of years and three species have not been observed in nature for several decades, According to Smithsonian Magazine.

That said, the species is known to be highly susceptible to overfishing because they grow slowly and produce few offspring and pollution and habitat degradation are major risks.

The IUCN’s shark group said climate change currently affects 10.2% of threatened Chondrichthyes.

“The tropics host incredible shark and ray diversity, but many of these naturally vulnerable species have been heavily fished by a wide range of fisheries for more than a century, with little need for improvement. remains under poor management despite countless commitments,” Colin Simpfendorfer, assistant professor at James Cook University, said in a statement. “As a result, we fear that we will soon confirm that one or more of these species has been driven to extinction by overfishing, which previously poses a serious threat to marine fish. The study will serve to make a turning point in efforts to prevent further irreversible harm and secure long-term sustainability.”

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