That appears to be a copper nose bream.
The Copper nosed bream will spawn once per month where I am.
What you are looking at COULD BE the results of , after spawning.
Often times both male and females will appear run down or have concave bellies after a spawn.
If you have coppernose bream then you probably have plenty of food in your pond. The Copper nose bream WILL cannibalize. I have seen it with my own two eyes. They will swallow anything they can get in their mouth.
My pond, which I stocked only about 5 months ago with copper nose bream is teaming with infants. I am 100% positive that these infants are not the same fish I stocked.
The fish I stocked were a max size of 2.5 inches for the larger ones. Most were an inch to 1.5 inches.
I was mad as hell when I found this casualty. I wanted to put gasoline on that bird and light him on fire. Regurgitated the fish as I ran out to scare him away.
This Bream measured 6.5 inches and is healthy as can be. And beautiful.