Researchers analyzed records dating back to the 1970s to track 18 species that dwell on the high seas, and found that their populations had dropped by 71.1 percent overall.
Researchers have been observing serious declines in oceanic and coastal shark populations around the Atlantic Ocean and in the waters off of South Africa and Australia for decades.Over the past half-century, oceanic sharks and rays have diminished around the globe, an international team of scientistsThe researchers analyzed records dating back to the 1970s to track 18 species that dwell on the high seas, and found that their populations had dropped by 71.1 percent overall.
Researchers have been observing serious declines in oceanic and coastal shark populations around the Atlantic Ocean and in the waters off of South Africa and Australia for decades. To investigate how sharks have been doing around the globe, Pacoureau and his colleagues pored over scientific papers, government reports, and other records and examined how the populations of different shark and ray species have changed over time.
For all 31 species, the Red List indicated that overfishing was the biggest threat . Since 1970, catch rates have tripled for sharks and rays. Additionally, more sharks and rays are kept after being captured to meet the growing demand for their fins. Pacoureau and his team estimate that, since 1970, sharks and rays have faced an 18-fold increase in relative fishing pressure, which measures changes in catch rates relative to the number of fish remaining.
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