Shark scientist since 1986. Passionate about sharks and rays, and their conservation and management. Lapsed academic.
Colin Simpfendorfer
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The sandbar shark is so boring even the triangles it forms with its fins are obtuse. #YawnShark @whysharksmatter.bsky.social
New paper is out 🔓!
We reconstructed the 145-myr diversity of sharks & rays using deep learning, unveiling hidden patterns:
- modern diversity levels by the Cretaceous 📈
- small decline in the K/Pg 🤏
- a peak in the Eocene 🌄
- a long-term decline towards the present �
www.cell.com/current-biol...
Great 🧵on 🦈 trends by @nickdulvy.bsky.social 👇🏼
Recent Grads! We are hiring six Fish Biologist-Survey positions across multiple duty stations.
Applications are due by April 20, 2026. For more detailed information on responsibilities and how to apply: www.fisheries.noaa.gov/careers-more...
New online! Bending back the curve of shark and ray biodiversity loss
In Issue 13, get the latest on our IUCN Red List assessments: what we’ve covered so far and where we’re heading next to strengthen the global picture for sharks, rays, and chimaeras.
Read issue 13 here: www.iucnssg.org/shark-news.h...
Or view online: 784f07501.flowpaper.com/IUCNSSCSSGSh...
onlinelibrary.wiley.com/doi/10.1002/...
Gaps in catch limits, compliance, and enforcement mean fishing mortality stays high even where policies exist.
Where management is complete, risk is lower and recovery is possible.
@hollieboothie.bsky.social
@sharkcolin.bsky.social
Read the paper here: rdcu.be/eZ9n9
Decline is not inevitable.
Where fishing mortality has been reduced — through catch limits, retention bans, or spatial protection — shark and ray populations are stabilizing or recovering.
Recoveries documented for wide-ranging and restricted-range species @charlie-huveneers.bsky.social
We don’t need new frameworks — we need to connect and implement the ones we have.
Fisheries management, trade rules, compliance, and demand must align to reduce fishing mortality at scale.
Implementation is the bottleneck.
@hollieboothie.bsky.social
@sharkcolin.bsky.social
Tobey Curtis 🦈
Catalina Pimiento 🆓🇵🇸
NOAA Fisheries
🌊Markus Knigge🐟
IUCN SSC Shark Specialist Group
Nature Reviews Biodiversity
Alec BM Moore
Nick Dulvy
Nick Dulvy
Nick Dulvy
Nature Reviews Biodiversity, Published online: 22 January 2026; doi:10.1038/s44358-025-00120-2Global shark and ray populations have declined sharply, driven by expanding fisheries and inequitable gaps in catch, trade and distribution data. This Review assesses global status, highlights drivers of decline, and outlines the regulatory, market-based and conservation actions needed to reduce mortality and reverse shark and ray biodiversity loss.
New paper out today in @natrevbiodiv.nature.com by the #GlobalSharkTrends team: Bending back the curve of shark & ray biodiversity loss;
Read the paper here: rdcu.be/eZ9n9
@sfu.ca
@sfubiosciences.bsky.social
@earth2ocean.bsky.social
