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Pumping alewives from the hold of a Lake Michigan trawler. This low-value fishwill be reduced to meal and oil. Alewives migrated in from the Atlantic Oceanand have become the leading species in quantity taken from Great Lakes waters.Catches of high-value fish have declined seriously. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 330 of Our Changing Fisheries 1970 Centenary NMFS centenary volume)