DD :

Here is the link where the discussion started. It is a very interesting thread.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=20;t=002198

A rolling spawn in BG is where an adult BG spawns only once each year but where the entire BG spawn occurs over an extended time period say 2 mths. Dave is studying if that is what occurs in far north ponds rather than the multi-spawn (adult BG each spawning several times a year on distinct times like full moons in may,june etc.)that have been observed in the deep south. If I did not describe that correctly then please correct me. ewest

PS : DD I always knew you were special -- you got 3 replys to your question in 4 mins. even if they are not all exactly the same. \:D Good one Theo \:\) .