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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

As the world's oceans heat up, salmon are migrating earlier.

Plankton are shifting their range.

But warmer water temperatures also mean warmer fish and faster running metabolisms.

Fish that in water of higher temperature have a higher metabolic rate, meaning they have to consume more oxygen.

Daniel Polly, a fisheries scientist at the University of British Columbia.

Because essentially the whole metabolism, all the chemical reaction in your body are accelerated.

So how about growing bigger gills to allow for more oxygen intake? Polly did the

physiological math on that and concluded that bigger gills just won't do the job, because he says

gills, being relatively two-dimensional, simply can't keep up with the three-dimensional

growth of the rest of a fish's body. Instead, Polly's calculations suggest that to feed their increasing

need for oxygen, fish of all kinds may actually shrink as a result of climate change. With decreased

supply, they'll need to lower demand. The studies in the journal Global Change Biology.

One more detail bears mentioning, and that is that warmer water also holds less dissolved oxygen.

So the two effects, the increased demand and the lowered supply, are working toward making the fish smaller.

Which means future fishermen might find a lot of lower value small fry in their nets.

Thanks for listening.

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