Antarctic icefish rewired their skulls to win an evolutionary arms race
Peer-Reviewed Publication
Updates every hour. Last Updated: 7-Oct-2025 01:11 ET (7-Oct-2025 05:11 GMT/UTC)
Antarctica’s Southern Ocean is one of the most demanding places on Earth when it comes to survival. Its waters plunge below freezing, long periods of darkness restrict growth and feeding, and food webs shift with relentless climate swings. Yet one group of fish — the notothenioids, or Antarctic icefish — not only survived here but flourished. From a single ancestor tens of millions of years ago, they evolved into dozens of species. Some cruise near the surface, others prowl the seafloor, and still others dart through the open water. A new study led by Rice University, published in the Proceedings of the National Academy of Sciences, reveals the secret behind this success: Icefish reorganized their skulls in ways that unlocked new feeding strategies and ecological opportunities.
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