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Keywords:

  • fish;
  • growth

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.