I was told the bream and bass would be the same size. Bream 2 to 3 inches and bass 2 to 2 1/4 inches. I've also read that a pond should be stocked as soon as it has water in it. I think you are right about the temp. but I was also told by a hatchery that bream and bass could be stocked any time of the year.
Thanks Chris for your reply.