Fished for their meat and liver oil, many remarkable deep-water sharks and rays now face extinction

Fri, 5 Apr 2024 19:19:58 +1100

Andrew Pam <xanni [at] glasswings.com.au>

Andrew Pam
<https://theconversation.com/fished-for-their-meat-and-liver-oil-many-remarkable-deep-water-sharks-and-rays-now-face-extinction-224230>

"The deep ocean, beyond 200 metres of depth, is the largest and one of the most
complex environments on the planet. It covers 84% of the world’s ocean area and
98% of its volume – and it is home to a great diversity of species.

Yet it remains among the least studied places on Earth, with no comprehensive
assessments of the state of deep-water biodiversity and no policy-relevant
indicators to guide the taking of species targeted by fisheries.

This also applies specifically to deep-water sharks and rays, even though these
species make up nearly half of the recognised diversity of all cartilaginous
fishes (sharks, rays, and chimaeras) we know today.

Our research highlights how our growing impact on the deep ocean raises the
threat to these species.

Using the International Union for Conservation of Nature Red List of Threatened
Species, we show that the number of threatened deep-water sharks and rays has
more than doubled between 1980 and 2005, following the emergence and expansion
of deep-water fishing.

We estimate one in seven species (14%) are threatened with extinction."

Cheers,
       *** Xanni ***
--
mailto:xanni@xanadu.net               Andrew Pam
http://xanadu.com.au/                 Chief Scientist, Xanadu
https://glasswings.com.au/            Partner, Glass Wings
https://sericyb.com.au/               Manager, Serious Cybernetics

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