Abstract
This paper tries to determine the best back‐calculation formula (BCF) for cod otoliths. The cod were tagged individually and measured regularly throughout a 3‐year period. Six different BCFs were compared: (1) Fraser–Lee with an intercept estimated from a linear regression of fish length (L) on otolith length (S), (2) Fraser—Lee with an intercept estimated from a symmetrical regression line of L on S; (3) the ‘body proportional hypothesis’ (BPH) for linear relationship; (4) the ‘scale proportional hypothesis’ (SPH) for linear relationship; (5) the BPH for non‐linear relationship; and (6) the SPH for non‐linear relationship. The ‘body proportional hypothesis’ seems to be more correct than the ‘scale proportional hypothesis’, and the non‐linear BCF seems to give the best results for cod otoliths.
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