What is the water source for this pond/stream? Will it be cold enough for trout? Having built a couple of lined stream/ponds, they are very fun for the family. Not sure just how much biomass you will be able to support in such a small BOW without some serious effort... If you can keep the water cool enough, I'd stick with trout. I doubt much of anything else will do well if the water stays cold enough for trout anyways...