Japan Aerospace Exploration Agency (JAXA) has set up an Aquatic Habitat aboard the International Space Station. Researchers will use the facility to look at how microgravity impacts marine life (bone degradation, radiation etc). More on NASA…
They are using the Medaka (Oryzias latipes, also known as Japanese killifish) – a small, freshwater fish – as a start. Next mission – send a kitteh to the space station ;)