NOAA Ocean Explorer: Estuary to the Abyss

This is the otolith (ear bone) of an American barrelfish. The structure contains rings, similar to the rings of a tree. By making a very thin section of a fish's otolith, and counting the rings, we can determine its age.

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Estuary to the Abyss

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http://oceanexplorer.noaa.gov/explorations/04etta/background/barrelfish/media/barrelfish_otolith.html