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Circadian clocks in a blind fish

Harlequinmania

By Harlequinmania,
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Harlequinmania

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Do animals that have evolved underground, completely isolated from the day-night cycle, still "know" what time it is? Does a normal circadian clock persist during evolution under constant darkness? A new study tackles these questions by investigating a species of cavefish which has lived for 2 million years beneath the Somalian desert, finding that it has an unusual circadian clock; it ticks with a period of up to 47 hours, and is completely blind.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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