Not much of a temp change than what you have add in STL. Bit cooler the last few days.
RC: none of the above. If it was an oxygen problem wouldn't I have issues with my bigger fish?
My big fish are doing ok, its just these small ones. I could see some still gasping. These are BG correct?
Well you said you saw one large fish out in the middle?? Do you know what was wrong with it yet? Was it out there piping for air? You may see more if it's a D.O. problem. Are these smaller fish near by where you treated the willow? If so it could be from the round up. Maybe some got in the water? Like I said no expert here just throwing out ideas of what it could be? Have you had a lot of rain as of late? Maybe something washed in from the water shed or washed off your willow tree and into the pond??
P.S. Yes those look like BG to me!
