Abstract
Daily increments were found in the otoliths of the fallfish Semotilus corporalis from three stream populations in central New York. By counting these increments one can verify annual marks and validate other less precise methods of aging. Results suggested that a false first annulus was observed in the only previous study of fallfish age and growth. Annual growth in length is shown to be linear. All three populations' growth rates were significantly different. Furthermore, the difference among these local populations can account for much of the.variability in the rate of growth exhibited throughout the species' range. It is therefore proposed that the nature of the local habitat, in particular the size of the stream and the density of conspecifics, may be the major determinant of the rate of growth in the fallfish.
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