These fish are the 13th and 14th generations of "space MEDAKA".
(rice fish / at Akashi Municipal Planetarium, japan.)
They are the posterity of four medakas which flew the universe by space shuttle Columbia in July, 1994. Ms. Chiaki Mukai was one of seven crews of Columbia and she was the first Japanese astronaut as a woman.
Please excuse about this photograph that my digital camera reflected in!!