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![Optical comparator being used for enumeration of invertebrate organisms inconnection with in situ behavior studies fish5591.jpg Optical comparator being used for enumeration of invertebrate organisms inconnection with in situ behavior studies](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish5591.jpg?itok=8mbqSY6I)
Description
Optical comparator being used for enumeration of invertebrate organisms inconnection with in situ behavior studies. This instrument, which can projectimages on a 12-inch screen, is also used for training plankton sorters inidentification of fish eggs and larvae. (Image credit: NOAA Central Library Historical Fisheries Collection)