Blue marlin blues: Loss of dissolved oxygen in oceans squeezes billfish habitat

This is a blue marlin with a PSAT (Popoff Satellite Archival Transmitting) tag used to monitor horizontal and vertical habitat use in a new study The science behind counting fish in the ocean to measure their abundance has never been simple. A new scientific paper in Nature Climate Change shows that expanding 'ocean dead zones' (areas of low oxygen) driven in part by climate change makes that science even more complex.

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