http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=my-males-swordtails-gave-birth-#1 I have 5 male swordtails ,I know that they are males because they have that sharp part that seems like a sword. Those sword tails are also big like females are and they have a visible black spot on there bellies ,all that at the same time and today one of them gave birth . What is going on? acutirostre 2011-11-12 http://forum.aqua-fish.net/?topic=my-males-swordtails-gave-birth-#2 Well, at least one of them is a female . If you uploaded some pictures it would help. jan 2011-11-14