Jean-Mark, The caudal fin us useful only on mature females. A better method is to see if the fish has abdominal stripes. A. cacatuoides females show zig zag abdominal stripes. A. agassizii females have none. I doubt that the two species will interbreed. Mike Wise Szalies Jean-Marc wrote: > What's the best way to differenciate those females ? > Would those interbreed (a male agazis with a female cacatoo by example) ? > > BTW: > Rams should learn to read, I got a couple that lay eggs on a stone, not in > gravel... another couple prefered gravel in the same tank. > Guppys should reads books too, they would know that at pH<6 and very soft > water, they should not give me so much childrens, they are WAY much more > productive than my other tanks (high hardness). And it's incredible to see > that rams don't even try to eat those childrens ! > > ------------------------------------------------------------------------- > 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"! ------------------------------------------------------------------------- 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"!