The Japanese Space Agency, or JAXA, will install a new aquatic node on the International Space Station today to study the effects of microgravity on fish and aquatic organisms. According to Universe Today,
This is not the first time fish have been part of a space mission. Versions of the AQH flew on space shuttle missions STS-47, STS-65, and STS-90. The current system’s design upgrades are based on lessons learned from these missions.
You can read more about the planned experiements and the Medaka fish that will become the astronauts’ new friends at http://www.universetoday.com/96475/fish-in-space-space-station-gets-an-aquarium/
I wonder if they plan to name the fish…