I found this airline tubing stained with methylene blue just 5 yards away from the river where I was hiking. I find it difficult to come to any other conclusion than aquarium fish were dumped in the river. I've said it a thousand times, I'll say it again. NEVER dump aquarium fish into the wild. The spread of exotic fish and of exotic diseases will lead to the end of the availability of fish for the hobby. There is no way to tell how the introduction of a species to an environment will impact it. If you can't keep your fish, euthanize them, find another home for them, or don't buy fish that you can't keep.

