Warming Antarctic waters come with a cost for the normally ‘robust’ rockcod

By Cody Mello-Klein February 20, 2026
Notothenia coriiceps (Bullhead notothen) sitting on rocks and surrounded by soft corals in an aquarium tank

Around 10 million years ago, Antarctica’s Southern Ocean started to get so cold that it scared away most fish in the region. Among the fish that stayed were what are now known as black rockcod, part of a famously sturdy family of Antarctic fish. 

But the black rockcod’s future could also now be in jeopardy as Southern Ocean temperatures are projected to shift in the opposite direction due to climate change. Researchers recently found that black rockcod raised in warmer waters hatched faster, smaller and with birth defects that could seriously impact their ability to survive in Antarctic waters.

Read more at Northeastern Global News

Courtesy of Bill Detrich

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