Ah so a dive in my local lake may be required...
Actually my cottage is on a very small lake in Northern Ontario (attached to a slighlty bigger lake be a series of canals so we have very little pollution). There is a fallen tree that's been under my dock for ages. I don't belive it provides much refuge to local fish because it's so large, in one peice and there are many other better spots close to it (including under my dock which is a hot-spot & great fishing

).
In removing a chunk of this tree - would I be able to use it in a fish tank? (probably not going to happen - I don't like touching mushy things

- but hypothetically). It's been there for at least 10 years, completely sumberged so it may just fall apart if I tried to move it, but it would be possible to burn/boil it because of huge fire-pit (we have a COTTAGE not a summer home

).
There are probably also some smaller peices I could find around my dock of sticks & such. I couldn't tell you what trees we have

. Kinda a mixture of northern ontario species all around the lake

a bit of everything.
I'm still not sure I would really want to remove anything from a lake though - for the most part fish hide under large natural rock caves & because the lake is so small it doesn't support alot of predatory fish so they just kinda swim around where they want (for instance we had a HUGE lake bass spawn swimming around the shallow end of our dock all summer). Is beach wood better for collection?
I was so tempted to take one of those bass-babies home

maybe next year...
Nes.