. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. Fig. 232. Mollienisia latipinna This is one of the most attractive of the fishes from Southeastern United States and Mexico. After many efforts we were fortunate enough to photograph the male in his- courting regalia. The dorsal fin ordinarily is- not so highly raised but appears as in Fig 234. The female is of the same species but nearly black in color, a natural freak which occurs once in several million specimens. Breeders have mated black specimens together until now a fairly pure stra
. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. Fig. 232. Mollienisia latipinna This is one of the most attractive of the fishes from Southeastern United States and Mexico. After many efforts we were fortunate enough to photograph the male in his- courting regalia. The dorsal fin ordinarily is- not so highly raised but appears as in Fig 234. The female is of the same species but nearly black in color, a natural freak which occurs once in several million specimens. Breeders have mated black specimens together until now a fairly pure strain of blacks has been established. The young are born alive. Breeding habits, page 242 (No. 18). These are principally marine fishes but live fairly well in fresh water. The author suspects they do best in a brackish water aquarium, and that if kept in fresh water they should, every few months, be given the progressive salt treatment described on page 83. Most of the live-bearing species mature early and breed before reaching full size, at ages from three to six months. Although fertilization takes place in the same general manner as in warm-blooded animals, and the young are developed within the body of the female, still it is not a true process of gestation. There is no connection between the embryo and the circulatory system of the mother. The eggs merely develop and hatch within her body and are dropped when fully formed. The period of development is very variable, depending on the species to some extent, but more upon temperature. We believe the time varies from about six weeks to six months, the shorter time being more usual. It has been noticed that a change of water is liable to bring about a delivery when the young ars about ready to appear, which can be judged by the development of a large dark spot near the vent of the female, as in figures 235, 236 and 239. Figures 232 to 241 are all viviparous or live-bearing species. 253. Please note that these images are extracte
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