Hi Warr/Reaper/Wee-Man -
This book says that fish actually has a built-in clock, as well as direction senor (based upon light direction, light strength/intensity, coloration, etc) that they use to determine which side is up or down, and what season it is, when it is time to breed, what the tides are, etc....
(And no - it is not their swimming bladder Reaper).
OOOOOPS! , must have had too many
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