yea they could have been froze but i ant never seen a 14 to 15 ft deep hole freeze all the way through but it could have i dont think the pond rowled over on you thats just were there ant any air in the pond were the fish would have been could not help you out man sorry to here you lost all your fish it will be hard to get as many as you did inless you have alot of time and or a guy or two to help you out with it