Koi possibly ate a rock
I have a pond with 2 koi and a few small common goldfish. I've had these kois for almost 4 years now, and they've grown a lot (got them when they were about 4 inches and now just over 12 inches.
I have rocks in the plant area in one section of the pond. Early, I noticed a rock stuck in one of the koi's mouths (unable to close, stuck open) and let it get it out, which was unsuccessful. I used a net to scoop it out and I THINK as I was trying to scoop him out, the net forced and pushed the rock in, but I gently checked with my finger and didn't feel anything. I'm pretty sure he just swallowed that rock, but he's not on his side or anything but just opening and closing his mouth nonstop ( I usually see this happen only after feeding, so I'm guessing he swallowed that rock). After an hour, still swimming and mouth opening and closing, not eating as the others eat. Is there anything I could do in my situation? Has anyone encountered a similar situation? It's probably deep in his stomach now....
Thanks in advance!! - really don't want the worst to happen since I've watched it grow over the years.