It isnt a lot but i never had one exept after a few days of heavy fishing, i see some so it wasnt expected. one thing I was thinking it might have been was, there is a lot of fish shallow on beds ect and it got very cold over night way into the high 30's and the pond cooled a lot in a very short time so i was thinking maybe this on top of stressed fish, or the overfeeding and at night the o2 level drop since there is a ton of alge and weeds. Hopefully its over.
