Not sure about your first question but as far as spawning I didn't think mine would have a chance of spawning in my small 1/3 acre pond but I did put several hollowed out logs about 10 ft long that the carpenter ants got to and I know that they did spawn last year cause I cought a 8 or 9 inch channel cat the other day and all the other cats were stocked over 3 years ago and all are 3-4 pounds up to about 8-9 pounds that we are catching. I also used some duct work that was 1 ft by 4' and about six ft long sections that I removed from the house during remodeling.

Bob