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On board a BCF research vessel, fishery biologists are measuring fish and taking blood samples for stock analysis. Each species of fish or shellfish iscomposed of stocks or subpopulations, which may differ slightly in structure,physiology, or rate of growth. Information on stocks enables biologists todetermine the sustainable yield of each stock. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 91 of Our Changing Fisheries 1970 Centenary NMFS centenary volume | Artwork by Bob Hines)