. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. Fig. 9 Single Tail Fig. 9A Tripod Tail Fig. 10 Web Tail Fig. 11 Double Tail Evolution of Double Tail or Fantail Goldfish The origin of those weird telescopic-eyed goldfishes has been the subject of a number of fanciful theories, but there can be little doubt that the strain was produced by selective breeding from the individ- uals which showed more or less bulging eyes. This would be the cor- rect scientific theory, and a recent discovery helps confirm it. The goldfish belo
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. Fig. 9 Single Tail Fig. 9A Tripod Tail Fig. 10 Web Tail Fig. 11 Double Tail Evolution of Double Tail or Fantail Goldfish The origin of those weird telescopic-eyed goldfishes has been the subject of a number of fanciful theories, but there can be little doubt that the strain was produced by selective breeding from the individ- uals which showed more or less bulging eyes. This would be the cor- rect scientific theory, and a recent discovery helps confirm it. The goldfish belongs in the same family as the minnows (Cyprinoids), and a minnow has been found in Nature with enormous and perfectly developed telescopic eyes, proving that the break is a natural one that might be expected to occur occasionally, and from which a strain of the same kind could be established, especially in a subject so readily bred as the goldfish. The specimen referred to is not a case of the disease called "pop-eyes," common to the sunfish and others. The eyes are purely telescopic and have been so determined by Henry W. Fowler, an ichthyologist of world repute who has specialized on the Cyprinoids. The accompanying photographic reproduction of the fish is convinc- ing, but the preserved specimen can be seen at the Academy of Nat- ural Sciences of Philadelphia. In life the fish was shown in a number of local aquarium society exhibitions. By careful selective breeding, types have become fairly well fixed, but the goldfish has a strong tendency to revert far back to ancestral types, in form as well as color, often to the annoyance of the breeder. One of the most interesting things about a spawning of goldfishes is the tremendous variety in the color. In a lot of a thousand young scaleless fishes there may not be two alike, and none may resemble either parent. That this is not ahvays so is a self-evident fact, else selective breeding would be without results. The accom
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