I wonder how healthy a stream would be,or if it would be worth fishing if it couldn't sustain wild birds?
Don't lose sight of the fact that these pellet eating fish aren't the most wary creatures, y'all flock down here to catch them because they are easy to catch, and provide a lot of fun. I'm sure Mr. and Mrs Heron, whether Blue White, Lesser, or Bittern, along with their neighbors the Bald eagles come here because the fish are easy to catch and tasty.
Come to think of it some humans come for exactly the same reason.