Viviparous fishes

Viviparous fishes, perhaps, the most widespread inhabitants of aquariums, appealing an amateur by the variety of forms and paints. They are able to live and propagate oneself even in the small aquariums. The fries of these fishes develop into the maternal organisms. They are born approximately after the tridtsatidnevnoy pregnancy, although this term can considerably vary, depending on the type of fishes and temperature of water which they are contained in. New-born fishes are enough large and immediately after birth can feed on shallow tsiklopami, that considerably simplifies their rearing, on comparison from molodyu of ikromechushih fishes. Smart, well developed molod of viviparous fishes, barely born, is able to be rescued from danger in the jungles of submarine vegetation and among supernatant aquarium of richchii. Thanks to this the fries of even shallow kinds contrive to be saved and successfully grow in the general aquariums even. However females from which expect to get the valuable posterity, better to transplant in the separate aquariums or banks, where the temperature 24—26 is supported °S. Peregrev over the indicated temperature is undesirable, because stimulates the premature appearance on light of still underdeveloped fries, and sometimes even caviars. Transplant most females for throwing of fries shortly to before their appearance. Time of transplanting is fixed taking into account the date of previous birth of molodi, and at some experience determine on the belly and darkening of ripening caviar which examines with x-rays by the dark patch on the stomach of females before anal plavnikom becoming round. And mnogoplodnih and comparatively tender females of visokoplavnichnih mollineziy better to transplant in the separate aquarium beforehand. It is possible in advance to delete from them other fishes, because these fishes sometimes badly carry transplantation especially combining with the change of water. Males of viviparous fishes are to be easily distinguished from females on form anal plavnika. It serves at them as a kopulyativnogo organ and is convolute in the prolate tube, while at females it wide, uploshenniy. Besides this females of viviparous fishes considerably larger than males, and through scale on the skin of belly the ripening caviar darkles before the anal opening. At the young females the still unimpregnated caviar is translucent as a small rather yellow spot, at adult impregnated — spot larger and more dark, and the belly becomes considerably thicker. Curiously, that some givorodki can repeatedly throw the fries being by isolated from males. As a result of the single coupling there is a simultaneous impregnation of good number ikrinok of at them, the development of which passes with the latent stage, thus the fries appear by portions as though.