Eric, there are no BG in the pond that I am aware of. Also, there is nothing above or below my pond that would allow BG or any other type of fish to get into the pond during a high water event. Anything other than what I stocked would had to have been introduced via a bucket or by bird, both of which I find very unlikely. I do have a heron that flies between my pond and another small one over the hill by the school, but I would be skeptical if the other pond had anything other than frogs in it.
Vertical stripes are not that usual for RES, here are a few examples from my photobucket library.
