I have (2) 4' high by 4' dia. pens I built out of pvc and palstic netting. I built them several years ago and kept herring in them in Lake Assawomsett. They last only ok in the lake. Water doesn't move enough. Salt will give you better results or moving fresh water. I would love to get rid of them both. No need for them now. I can send you a photo if you would like. Paul
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