Many thanks Mike Jacques Mike & Diane Wise a écrit: > Jacques, > > In general, this is correct. Lower pH values produce more Pelvicachromis males. However > each species or form has a different pH value where you produce equal numbers of males > and females. The Common Krib (Pv. pulcher) has a 50/50 ratio at around pH 7. The Giant > Krib (Pv. sp. aff. pulcher) has a 50/50 ratio at around 6.3. At this same pH (6.3) you > get 75%+ male Pv. pulcher. The secret to getting the proper ratio of males and females > depends upon finding each species' preferred pH value. > ------------------------------------------------------------------------- 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"!