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Image Number D3158-1 At the University of Wisconsin-Milwaukee School of Freshwater Sciences, ARS fish physiologist Brian Shepherd (left), animal caretaker Timothy Paul (middle), and student Eric Vang collect data from male and female yellow perch as part of research to genetically improve the fish.  Photo by Robert Colletta.  640 pixels wide: (d3158-1.jpg)   Please visit our Image Gallery


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