Abstract
AN abnormal pelvic structure in the form of an additional median fin (Fig. 1) was first observed in the powan during field studies on the population of this species of whitefish in Loch Lomond in 1951. Between 1951 and 1953 eighteen fish, representing 1.5 per cent of the total number examined, were found to have this abnormality; its occurrence is independent of sex of the fish or of their regional location in the lake. All these fish were two or more years old, but one specimen reared in the laboratory showed that the structure first appears at the age of about six months.
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GERVERS, F. A Supernumerary Pelvic Fin in the Powan (Coregonus clupeoides Lacépede). Nature 174, 935 (1954). https://doi.org/10.1038/174935a0
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DOI: https://doi.org/10.1038/174935a0
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