Fish in zero-g

On ESA's 31st parabolic flight campaign, students from the University of Lund, Sweden, recorded the motion of four fish under various lighting conditions - from above, from below, from the side and without any light.

Under microgravity the fish tended to align themselves so that the light came from above. When there was no light, the fish used pressure sensors on their body to align themselves with respect to rods installed in the aquarium.

(Photo: ESA)