Title: Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects
Identifier: cu31924000386668 (find matches)
Year: 1921 (1920s)
Authors: Innes, William T. (William Thornton), 1874-1969
Subjects: Aquariums; Goldfish
Publisher: Philadelphia, Innes
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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Fig. 6j. Molliciicsia pctciisis (Life si:i'l There are two nther forms of Mollienesia used largely in the aquarium, ,1/. latipiiiiia and .1/. z'clifera, the principal external differences being in the size of the dorsal hn. The aliove shows the handsomest and rarest variety. The male has the extraordinary dorsal development, but the fin is only held fully erect in moments of excitement, at which time he is strikingly beautiful. Darwin, in "The Descent of Man," refers to this fish on account of the great difference in appearance between the male and female. The young are born alive. Those shown in illustration are alxiut twelve weeks old. MoUienesias are naturally salt or brackish water fishes. They become fairly well acclimated to fresh water, but do not stand much disturb- ing after once being settled in an aquarium. Slightly brackish water suits them better. Specimens bred In captivity seldom attain the highest development of the dorsal fin. Figures 65 to 71 all have their young born alive. .\s the male reaches the breed- -"-- -â¢â " the anal fin develops into an organ of intromission. This easily distin- guishe the sexes. See pages 257 (B 9) and 260 (N 2). 80

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