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Oceanic sharks and rays have declined by over 70% 28 Jan 202128 January 2021 Last updated at 06:58 Getty Images The number of oceanic sharks and rays worldwide has fallen by 71% since 1970, according to a report by a team of scientists from around the world. Their study finds that more than three-quarters of these oceanic species are now threatened with extinction and over the past 50 years fishing pressure has doubled and shark and ray catches have tripled. The team assessed the risk of extinction for all 31 species of ocean shark and rays. Of the 31 oceanic species, 24 are now threatened with extinction and three shark species (the oceanic whitetip shark, and the scalloped and great hammerhead sharks) have declined so sharply that they are now classified as critically endangered.

Sonja fordhamNicholas dulvyNathan pacoureauShark advocates internationalSimon fraser universityGreat hammerheadOceanic whitetip sharkGreat white sharksNorthwest atlanticசோஞ்சா ஃபார்டம்சுறா வக்கீல்கள் சர்வதேசசிமோன் ஃப்ரேசர் பல்கலைக்கழகம்நன்று சுத்தியல்நன்று வெள்ளை சுறாக்கள்வடமேற்கு அட்லாண்டிக்