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Collective motion of self-sustained swarming flows has recently provided examples of small-scale turbulence arising where viscous effects are dominant. We report the first observation of universal enstrophy cascade in concentrated swarming sperm consistent with a body of evidence built from various independent measurements. We found a well-defined k −3 power-law decay of a velocity field power spectrum and relative dispersion of small beads consistent with theoretical predictions in 2Dfatcat:q2hrlrpe5vcwzpovqez66rdl2i