Science

Ancient fish bones reveal how Arctic cod species survived the last ice age

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Briefings

A new study from Stockholm University, published in October 2026, concludes that the glacial Arctic Ocean served as a breeding ground for marine fish evolution during the last ice age. Researchers analyzed small fish bones recovered from deep-sea sediments aboard the Swedish icebreaker Oden, revealing that cold adaptation evolved in these fish populations rather than in terrestrial environments.

Key points

• Researchers analyzed small fish bones recovered from deep-sea sediments aboard the Swedish icebreaker Oden.
• The study concludes that cold adaptation evolved in marine fish populations during the last ice age.

Context

This research challenges the traditional view that the glacial Arctic Ocean was a barren ice desert, instead identifying it as a critical breeding ground for marine fish evolution. The findings, published in October 2026, provide new insights into how Arctic ecosystems adapted to changing climates.

Limitations

The evidence is limited to small fish bones recovered from deep-sea sediments during an expedition aboard the Swedish icebreaker Oden. The study does not provide data on specific fish species, exact dates of adaptation, or quantitative measurements of cold adaptation rates.

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