rcn

I suspect that with the recent hard freezes we have had and the fact that this stressed already stressed fish (transport/new environment/predators/etc) you were bound to have a few morts. 9 out of 3160 is not bad. Don't think it is the oak. Friend with a much smaller pond also had some morts with the rapid weather change. Check the temp of your pond, I will almost guarantee that its cold enough to shut down the supplemental feeding. Also sent you a pm