The weight-length relationship of charr, (Salvelinus willughbii Gunther), in Windermere

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Abstract
The weight-length relationships of several groups of charr, Salvelinus willughbii Günther, in Windermere have been investigated. For mature charr of normal growth no significant differences in the slopes of the weight-length regression lines were found between males and females, nor between spring spawners and autumn spawners; the weight-length relationship of all mature charr of normal growth can be described by the equation y = −1·67 + 2·81 x where y is log weight in g and x is log fork length in cm. The weight-length relationship of immature charr differed very significantly from that of mature charr of normal growth, and can be described by the equation y = −2·36 + 3·27 x. Some mature charr tentatively identified as “dwarfs” by their slow growth differed very significantly in weight-length relationship from mature charr of normal growth. But there were no significant differences between mature “dwarfs” and immature charr of both normal and “dwarf” growth as regards weight-length relationship.

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