sorry about the poor pic and bad link.
i hope this link to a youtube video works better.
still not a very good example to ask for id.
the thing is, there is a small pond next to the one in the video that used to
be a duck wadding pond. before i ever put fish into the system, the two larger dark
fish showed up in the spring. likely from some duckweed i grabbed from a
nearby pond the summer before. maybe they are carp?
https://youtu.be/FwtPlk6_e78