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KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Light microscopy of the beating heart of a fry of a roach (Rutilus rutilus). When the fry have just hatched they are transparent, allowing internal structures to be seen. Blood is seen entering the heart from lower right and being pumped out at upper left. The dark spots are pigment cells that will eventually cover the fish's skin. The roach is a common freshwater and brackish water fish found throughout Europe and western Asia. This specimen was collected from the Grand Canal, County Kildare, Republic of Ireland.
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