In 1975, NASA carried killifish into orbit; the weightless fish began swimming in loops, yet their embryos developed without detectable abnormalities

A 1975 NASA mission studied killifish to understand weightlessness effects on the human body. Juvenile fish swam in loops upon reaching orbit, showing disorientation in zero gravity. These fingerlings gradually adjusted their swimming patterns over several days in space. Meanwhile, developing embryos showed no behavioral disturbances or abnormalities during the flight. This early experiment continues to inform space biology research today.
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