Originally Posted By: teehjaeh57
I've heard some folks warn about the tannins in certain wood harming their fish [was it oak or walnut - I don't recall] so please be careful and check around first before you use the oak unless you already know it's safe.


It is the juglone from black walnut nuts, bark, and leaves that is toxic to fish. To the best of my knowledge, the tannins from hardwoods like oak and birch are not harmful. I've dropped a number of hardwood trees into the edge of my pond. They work great. Because of their size they don't move. The cedars and pines I've put in needed to be anchored, otherwise they move around.

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