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KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Light microscopy of the tail 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 flowing down to the tail then back up to the heart. The dark spots are pigment cells that will eventually cover the fish's skin. The vertebral column is seen above the blood vessels. 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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