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Celestial Eye
Breed of goldfish / From Wikipedia, the free encyclopedia
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The celestial eye goldfish or Choutengan[1] is a double-tailed breed of fancy goldfish that possesses a distinctive pair of telescope eyes, in which the eyeballs are turned vertically and the pupils appear to be gazing skyward.[2]
Upon hatching of celestial fry, the young fishes' eyes are positioned normally but gradually enlarge, such as with the telescope eye goldfish. However, the telescope-eye still gazes laterally; the celestial goldfish's pupils will shift to a near-vertical (at times, "cross-eyed") gaze within a six-month period after hatching, as the eyeballs are repositioned and the pupils are centered on the top of the head.[3]
This process is entirely governed by genetics; early sources perpetuated the myth that the fish were bred in and contained within narrow-necked clay jars, with the eyes mutating upwards in search of what limited light they could receive.[4]