In 1994, Japanese killifish, Medaka (Oryzias latipes) mated, laid eggs, and had babies in space. This was the first successful mating behavior carried out in space by vertebrate animals. Recently, the author has edited a video tape, which contains the video images of the fish mating, development of eggs, swimming behavior of baby fish in space, and also scenes of various preparatory experiments on the ground. The video tape is available, without any charge when requested to the author (K. Ijiri). This paper explains for each scene of the video tape.