>>Lack of vigor tends to be a byproduct of line-breeding, which somehow gives weaker genes an advantage in gaining distribution within a population.<< Mother Nature is not as finicky about Euthinasia as we fish keepers. Weeker genes are nuturally selected against in the wild as they tend to promote characteristics the result in natural culling, either from disease, as food for other fish, or an inability to breed or a disadvantage in breeding competition. Ma Nature only uses a freezer in the high and low latitudes! ;-) Bill Vannerson McHenry, IL http://ourworld.compuserve.com/homepages/william_vannerson ------------------------------------------------------------------------- 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. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!