That seems early, to me, for the LMB spawn, but if that's what you've experienced, then so be it.
I wonder what the actual effect would be on LMB or Bluegill, spawn wise, from an electroshock survey. The fish are incapacitated for only a few minutes, so I would think they would only be affected if they were actually dropping the milt or inseminating the eggs.
However, maybe the electricity would so something to the eggs.
Would be good to hear from an expert on this one.