As I recall, the experts have given us some guidelines on how close you want water temps between transport bag and pond before you release. Thinking it was 10F? Maybe it was 5F.
I have done a 3 hr drive and a 1 hr drive to stock- from the actual hatchery, not a truck. both loaded the bags with pure O2 and rubber banded and both in cool weather. The 3 hr drive had some fish that were pretty lethargic by the time they got to the pond. Some still very vigorous. I hurried the tempering just to get them into high O2 water again. Lost a couple dozen fish out of the bag and chalked it up as part of the deal. The 1 hr drive stocking was very smooth. Lost a single BG.
