Fig. 2. Top: Fish length at age from the re-analysed samples. Age based on old age determination method (narrow boxes) and on the new method applied on the same samples cleared in glycerol (wide boxes). Middle: Fish length at age based on the new method used on frozen-stored samples from surveys in the main adult distribution area in 2006 and 2007. Bottom: Between-reader comparisons of age estimates based on the new method applied on a subsample of the data included in the middle panel. Each box-plots shows the modal, inter-quartile range, main range and outliers.