Have searched forum for negatives on using cedar (juniper) trees for structure and have not seen any. Yet in NE Texas there is a belief, rumor or myth that cedars give off noxious gasses when decomposing that will kill fish, etc, etc. Can anyone fill me in on real facts. Thanks.

Theres not a whole lot of difference between cedar trees and christmas trees. I put christmas trees in my pond every year. You can wait and see what others have to say but I think there fine.

Bobby, I use cedar trees often and have for more than 25 years. I have yet to see any dead fish from their use. At the same time, I don't put them in small ponds. I use them to enhance or create structure in larger lakes.
I don't know of scientific studies or literature that confirms or negates any of the wives tales.
That's my thoughts.

I have used a lot of cedar and other xmas trees and never had any problems.

I've used both large and small cedars in my one acre ponds. No problems with cedars but I will never again use green oaks. I killed off my pond for 2 years due to the tannins in post oaks.