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Back-calculated lengths at the last annulus of chub Squalius cephalus across lowland rivers in England, where (A) all data up to age 15 years (n = 2096); and (B) the data used in analyses, where fish were only included to age 10 years due to ageing accuracy concerns above this age (n = 1694), and where the dashed line is the significant relationship between the variables according to linear regression.
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