. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. Fig. 146 Fig. 147 Tripod Tail Web Tail Evolution of Double Tail or Fantail Goldfish Fig. 148 Double Tail edge instead of being completely divided. From these early "breaks" have been developed the fully divided tails, double anal fins, et cetera. The origin of those weird telescopic-eyed goldfish has been the sub- ject of a number of fanciful theories, but there can be little doubt that the strain was produced by selective breeding from the individuals which showed more or less b
. The complete aquarium book; the care and breeding of goldfish and tropical fishes. Aquariums; Goldfish. Fig. 146 Fig. 147 Tripod Tail Web Tail Evolution of Double Tail or Fantail Goldfish Fig. 148 Double Tail edge instead of being completely divided. From these early "breaks" have been developed the fully divided tails, double anal fins, et cetera. The origin of those weird telescopic-eyed goldfish has been the sub- ject of a number of fanciful theories, but there can be little doubt that the strain was produced by selective breeding from the individuals which showed more or less bulging eyes. This would be the correct scientific theory, and a recent discovery helps confirm it. The goldfish belongs in the same family as the minnows (Cyprinidce), 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 estab- lished, especially in a subject so readily bred as the goldfish. The speci- men 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 Cyprinidce. Fig. 167, an actual life photo- graph of the fish is convincing, but the preserved specimen can be seen at the Academy of Natural 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 goldfish 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. T
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