Scientists are able to determine the age of a fish by counting the number of
yearly deposits of bone on the otoliths (ear bones) of fish. Otoliths of the
pollock - a codlike fish - are being removed in a study of the growth of the
species.
Image ID: fish7984, NOAA's Historic Fisheries Collection Credit: NOAA Central Library Historical Fisheries Collection; P. 97 of "Our Changing Fisheries" 1970 Centenary NMFS centenary volume
