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Xiphophorus helleri
 

Xiphophorus helleri

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.

Xiphophorus helleri

Wagtail variety. Size: 15 cm.

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ЗЛАТОПОЛЬСКИЙ Савелий Соломонович (1855-85) , член Исполкома "Народной воли". Участник покушений на Александра II, в 1881 руководитель военной организации "Народная воля". В 1883 приговорен к вечной каторге. Умер в Шлиссельбургской крепости.