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I have seen tadpoles eat goldfish eggs, so I expect koi eggs would be eaten also. I get small frogs in my lily pond, but not in the koi pond. The koi eat frog tadpoles (but not toad tadpoles) and they eat small tree frogs that get in the pond to spawn. I never see large adult frogs around the koi pond, but I do not think the koi would go after them because too large. I think the currents deter the adult frogs. They prefer the quiet water of the lily pond.
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