File:California fish and game (19892765503).jpg

English: The specimen of Symphurus atricauda at the top of the photograph is the first reported instance of reversal for the species. The center individual shows the normal sinistral condition. The bottom individual is the second reported incidence of ambicoloration for the species.

Title: California fish and game
Identifier: californiafishga67_1cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
66 CALIFORNIA FISH AND GAME A dextral 5. atricauda was briefly mentioned by Mahadeva (1956 unpubl.), but the specimen was undescribed and no data provided. Therefore, I feel that this is the first documented report of reversal for the California tonguefish. Reversal in the Cynglossidae is not common. The first incidence of reversal reported was for S. plagiusa (Linneaus) trapped off Louisiana by Chabanaud (1948). A second reversed S. plagiusa was trawled from Duplin River, Georgia
Text Appearing After Image:
FIGURE 1. The specimen of Symphurus atricauda at the top of the photograph is the first reported instance of reversal for the species. The center individual shows the normal sinistral condition. The bottom individual is the second reported incidence of ambicoloration for the species. (Dahlberg 1979/?). The only other record of reversal in the tonguefishes was a reversed and partially ambicolorate S. diomedianus (Coode and Bean), from the Gulf coast of Florida (Moe 1968). Because both Chabanaud's and Moe's specimens lacked pelvic fins, they hypothesized that reversal may inhibit the development of pelvic fins (Chabanaud 1948, Moe 1968). However, Dahlberg (1970/?) reported that, "The presence of reversed, but otherwise normal pelvic fins in my specimen does not support their conclusion." Normal California tonguefish have only one pelvic fin, and it is found on the left (-eyed) side. In this reversed specimen the pelvic fin was on the right (-eyed) side; the fin was otherwise normal. This also does not support the pelvic fin inhibition theory. There is insufficient evidence at this time to indicate any true connection with the inhibition of pelvic fin development and reversal. Norman (1934) and Dawson (1962) both suggested that the Cynoglossids and Soleids are highly specialized. Work by Dawson (1962), and Haaker and Lane (1973) suggested that the more primitive groups of flatfishes show a higher occurrence of anomalies than those groups which are more specialized. If this were true, Cynoglossids and Soleids would show a lower incidence of anomalies

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