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The original was posted on /r/todayilearned by /u/Double-decker_trams on 2025-05-08 08:58:23+00:00.

Original Title: TIL when fins are removed from Great White Sharks or Whale Sharks and are thrown back into water still alive, they die because they suffocate. If they don’t swim they stop receiving oxygen, since no water is being pushed through their gills (they can’t pump water through their gills themselves).