I know from my experience that when the water temp gets in the 80s the yellow perch just about disappear or it seams. They are there they just do not need to eat.

The blue heron will come on the full moon and will train to the feeder too. When the feeder gos off the heron will be there ready to pick off what fish he can.

I wonder how many fish one could eat. Most all the fish they eat do seam quite small. The blue heron will barf in the pond to chum the small minnows in to eat more. I have seen live minnows barfed into the pond and shore by these buggers.

[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.