The photo opposite clearly shows why X. helleri is known as the swordtail. A
very lively fish, it can leap out of the aquarium, and the male is sometimes truculent.
Females do not have the "sword." The female can produce up to 200 fry and exhibits
behavior very rare among fish and indeed all other animals: after one or two spawnings,
she can undergo a spontaneous sex reversal, and function in all respects like a
male! Size: 15 cm.
Gold variety. Size: 15 cm.
Wagtail variety. Size: 15 cm.