My concern with oak trees is tannin from the leaves, acorns and bark entering the water. I don't know if that is a problem with pin oaks.
I think it all depends on the amount of tannin and/or the amount of water in the pond. I'll get enough water in my pond from the surrounding Oak forest to drop visibility from 6'-7' to approx. 24" just due from the tannins in the water. Haven't had a fishkill (yet). The forest is made of mostly Pin Oaks, due to the seasonal flooding it gets. It's considered a "Wooded Wetland". I have White Oaks, Hickories and Sugar Maples growing too, but that is on the higher ground. The woods could be flooded for 2-5 months in the Spring if it is a wet Spring.
