With the old pond another thing I did not like was netting fish with the long handle nets with the steep deep sides. It seemed like you were always leaning out over the pond and many times I would just run a board over to stand on but inevitably they would always swim to the other side... so out comes the net to the other side ...and again ... and again....
So this is my solution: I found a piece of high cascade granite that has a pretty nice shape and fairly flat textured top. I removed some material from the forward sides and front at about a 45 deg angle to lighten for counterbalance and the polished it up with 50 grit to smooth out the bottom so as to minimize and damage done by jumping/bumping koi. I then slotted the rock to fit over and be mortared to the block wall when filled. It will be one block higher than the top course so actually will not be submerged but just above the water. It came out at 34" long by 16" wide with about 16" extending over the wall and about 220 pounds (bathroom scale) so 2 people should be able to lift it over and set it on the block. I am really happy with the way it turned out and as an added bonus it might be a nice place to view/watch/feed from.
Lester