Medaka fish kept in semi-natural outdoor environments experience reproductive clocks that are significantly out of sync with those kept in laboratory conditions, ovulating approximately 3.5 hours earlier.
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https://www.sflorg.com/2026/05/phgy05202601.html
Lab Fish Reproductive Cycles Off by Hours

OMU research shows medaka fish in semi-natural settings ovulate 3.5 hours earlier than in labs, highlighting risks in lab-based biological studies.