I am trying to catch my pond fish to bring them in for the winter. I have caught all but two, a black moor and a small koi. There is a little shelf built into the pond for fish to hide and keep out of the sun during the summer. This is where these two fish are hiding. Today, I drained the pond leaving enough water for them to survive. I tried to encourage them to come out by using aquarium tubing to disturb them. The water, of course, became very dirty and I could not see if even if them ventured out. It is getting cold and they seem to be hunkering down. Any suggestions on how to catch them?