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A little wonder, every day

A cavefish clock depends on experimental conditions

Документальне фото печерної риби Phreatichthys andruzzii; не часовий ряд клітинного репортера / Documentary cavefish photograph; not a cellular-reporter time series. Credit: Hectonichus; CC BY-SA 3.0. https://creativecommons.org/licenses/by-sa/3.0 Source: https://commons.wikimedia.org/?curid=41742666

Документальне фото печерної риби Phreatichthys andruzzii; не часовий ряд клітинного репортера / Documentary cavefish photograph; not a cellular-reporter time series. Credit: Hectonichus; CC BY-SA 3.0. https://creativecommons.org/licenses/by-sa/3.0 Source: https://commons.wikimedia.org/?curid=41742666

Listen to fact0:00 / —

In a 2011 study, the cellular clock of blind cavefish Phreatichthys andruzzii had a period near 47 hours at 22 °C after a specific synchronizing pulse. At 25 °C it was about 43 hours, and at 29 °C about 38. Thus “the fish lives by a fixed 47-hour day” overstates a result dependent on temperature and experimental procedure.