I put in my pond 100 perch a couple of months ago and have not seen them, even as I feed my minnows every day. My pond is full of minnows so I suspect they are feeding on them. I have lots of Red Wing blackbirds living in the cattails of my pond and perhaps they eat my numerous tadpoles. Since I let my pond grow spatterdock lilies I to know they eat lots of bugs and spiders that live in the spatterdock.