Cecil: I did not stock any fish. I am working with fish that were already there when I bought the place. Thanks to all for the responses to the initial question. Many times I have also observed the counterclockwise swimming of the bg mentioned in one of the previous post. This past weekend when I was at the pond, a weekend getaway at the moment, the colony I was observing went from 22, 100% occupied nests to only 6 occupied nests. This change happened sometime between 8-1-05 and 8-4-05. There was one pair of bg in the largest diameter nest over this past weekend and they were doing the counterclockwise swim routine. The other 5 nests were not following suit. Usually when I have observed the counterclockwise routine they would all do it at the same time.

I have looked at picures of bg trying to identify the ones I have as pure or hybrids and am having much difficulty. Is there one main characteristic of the hybrid that is a dead on identifier? If not maybe I can post a picture of one for the help of the forum. What a great site! Thanks again to all!