My best guess on the mystery fish would be a Goldfish or Koi, people who don't own toilets or don't want to make their kids cry when they get too lazy to keep a fish, let em go there and all long the creek, some people even use Goldfish as bait. Both are illegal and not ethical. Goldfish and Koi are almost identical to Carp, they are just bread for color, all can live in almost any waters and are nearly impossible to remove from any waterway. They are responsible for killing native fish eggs and lowering water quality when present.
Not sure why I don't like carp, they sure are fun to catch!
(will steps off soapbox)
Not sure why I don't like carp, they sure are fun to catch!
(will steps off soapbox)