Highlighted moments
They put pairs of fish in a contraption that's the marine equivalent of a treadmill.
“Fish that migrate over great distances maintain a Goldilocks pace as they go. It's fast enough to get them where they want to go in a reasonable time. But it's not so fast that they're worn out by the swim or can't mount a quick burst if they face danger.”
“if one member of a pair was faster than the other, it didn't just pull away. Instead, it slowed down to stay with its companion.”
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