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Density and color enhancement of photograph of fish school and contrail byPhilco Ford for BCF. To enhance readability of original photograph, whichconceals many details, each subtle tone is assigned a color. This and otheradvanced techniques makes it possible to identify fish schools, changes in plant life in water, water depths, and polluted areas. See images fish7971 and 7972. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 442 of Our Changing Fisheries 1970 Centenary NMFS centenary volume)