Optical comparator being used for enumeration of invertebrate organisms in connection with in situ behavior studies. This instrument, which can project images on a 12-inch screen, is also used for training plankton sorters in identification of fish eggs and larvae.

Image ID: fish5591, NOAA's Historic Fisheries Collection
Location: California, La Jolla Laboratory
Photo Date: 1965 Circa
Credit: NOAA Central Library Historical Fisheries Collection

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