Who were the fish from ? How long had they been out of the hatchery (in truck)? Doubt it is your water but rather stressed fish. Glad they will replace - a good sign.
Alabama fish and pond. I just emailed them and asked if I should be seeing this kinds of numbers daily. They said no and took the responsibility whether it was really theirs or not. If it was sick fish on delivery then that is fine by me, but if there is something wrong with my pond, then I need to get it taken cared of before I put the bass in in June.
The fish truck said they would be at the store for 2:30. I got there a bit earlier and they were already there so i don't think they were there long. Within 30min of paying for fish, bagging them and the drive home, the bags were in the pond in the shade acclimating for 15 min. The fish truck may have had close to an hour drive to the feed store.
