Cross-Section of Salmon Otolith (IMAGE)
Caption
A slice of an ear bone, or otolith, from a juvenile winter-run Chinook salmon. The otolith measures about the size of the eye of a needle, with daily growth increments that resemble tree rings indicating when the fish hatched. White circles indicate where an ion microprobe measured oxygen isotopes to reconstruct temperatures the fish experienced just before emerging from their gravel nests, called redds.
Credit
George Whitman/UC Davis Center for Watershed Sciences
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Credit: George Whitman/UC Davis Center for Watershed Sciences
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