As an aside on this topic, I vaguely remember reading somewhere that deer in the wild vary the sex of offspring based on food availability. IIRC, when food was plentiful, the does would have more males, but when food got scarce, more females would be born. I assume this has to do with the amount of growth either sex has to do in order to be successful a reproducing. When there is less food, a female has a better chance of reaching maturity and reproducing, because she does not have to be as large to win the right to mate. Could something similar has influenced the apistos sex distribution? Jon -- Jon Wright Jon.Wright@DropShip.org ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader