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Tag: sawfish conservation

Critically Endangered sawfish are spinning in circles until they die. What the heck is going on?

Posted on May 29, 2024May 29, 2024 By David Shiffman
Critically Endangered sawfish are spinning in circles until they die. What the heck is going on?
Conservation, Science

An epidemic of spinning disease is killing these Critically Endangered animals in a horrifying way. I spoke to experts to help understand what’s going on and what’s being done to help. A dead sawfish is unloaded by the Florida Fish and Wildlife Conservation Commission in preparation for a necropsy. Image courtesy Florida Fish and Wildlife … Read More “Critically Endangered sawfish are spinning in circles until they die. What the heck is going on?” »

First systematic threat analysis reveals that 1/4 of sharks, rays, and chimaeras are threatened with extinction

Posted on January 21, 2014 By David Shiffman
Conservation, Science

It took a team of over 300 scientists nearly two decades, but the first systematic analysis of the conservation status of chondrichthyans (sharks, rays and chimaeras) has been completed. The results, published today (open access) in a paper titled “Extinction risk and conservation of the world’s sharks and rays,” are chilling.

“Our unprecedented analysis shows that sharks and their relatives – which make up one of the earth’s oldest and most ecologically diverse groups of animals  —  are facing an alarmingly elevated risk of extinction,” said Dr. Nick Dulvy, IUCN SSG Co-Chair and Professor at Simon Fraser University in British Columbia.

As of the writing of this paper, the IUCN Shark Specialist Group recognized 1,041 species of chondrichthyans. However,  a new species is described, on average, every two or three weeks! Out of these 1,041 species of chondrichthyans, approximately one in four are considered “Threatened” by IUCN Red List criteria;  113 species are Vulnerable, 43 are Endangered, and 25 species are Critically Endangered. 487 species are considered Data Deficient, but the IUCN Shark Specialist Group estimates that 68 of them are likely to be Threatened as well! Most alarmingly, only 23% of known chondrichthyan species are considered Least Concern, the lowest percentage out of any group of vertebrates on land or sea!

A hierarchy of IUCN Red List categories. Note that "Threatened" includes Vulnerable, Endangered, and Critically Endangered
A hierarchy of IUCN Red List categories. Note that “Threatened” includes Vulnerable, Endangered, and Critically Endangered

One of the two main factors influencing Threatened status is the size of the animal. Larger bodied species are sensitive to overfishing because they typically have a life history with slow growth, late age at maturity, and relatively few offspring. Additionally, living in coastal habitats (in other words, close to humans) makes a species more likely to be Threatened.

Read More “First systematic threat analysis reveals that 1/4 of sharks, rays, and chimaeras are threatened with extinction” »

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