Only causes temporary stunning yes. In the case of Trinity Western they shocked it to remove the invasive species (mainly Largemouth and Pumpkinseed) in addition to doing counts...however the shocking was not very effective which is why it's surprising to me that NB has absolutely nothing milling about in the shallows. I'm hoping I was just there on an "off" day but I went out Bass-ing again last night at one of my more regular haunts and it was Sunfish and Bass galore.