EWEST,

Cannibals...that seems like a very good possibility also. The GG's really do attack small minnows. The trap did catch some small Gambusia, so I doubt it is too small to catch GG offspring. Maybe they are very late spawners compared to regular BG?

I'll continue the trapping as the summer goes along and report results. The thesis of the experiemnt is to evaluate the growth, aggressiveness, and sustainability of the GG's in a small pond. The trapping is part of the evaluation of the sustainability and nothing more. I'll continue to trap during the summer and report results...as well as continue to measure and report on the growth and aggressiveness.