Thanx, not easy to see the tails, I'll try your method. Those are juveniles except one cac. (btw, she has "rounds" (ocelles in french) on the tail) I still had a fem cac. and I bought a new couple (couldn't just get the male alone) and a couple agazis. Meaning is not to interbreed, but as they're in the same tank (they seem happy, from 3 weeks, no agressivity) it's good to know... Seems there's only 2 femalles now. I'd find "logic" that Mss Cac1 killed Miss Cac2 and let Mss Aga alone, but I try to check... > -----Original Message----- > From: Mike & Diane Wise [SMTP:apistowise@bewellnet.com] > > 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) > ? > > > ------------------------------------------------------------------------- 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"!