Vasconcelos et al.: Population identification of Trachurus picturatus in the Northeast Atlantic 
87 
Figure 6 
Mean and standard deviation (SD) of the cumulative variance of 100 har¬ 
monics for 60 randomly selected otoliths of blue jack mackerel (Trachurus 
picturatus) taken from fish sampled in 2015 in the northwest Atlantic Ocean. 
Mean (open squares) and standard deviation (whiskers) values represent the 
accumulated percentage of variance (% accum. var.) explained by the /?th 
harmonic. 
Figure 7 
Mean otolith shape for blue jack mackerel (Trachurus picturatus) sampled in 
2015 from the Madeira archipelago (solid black line), off mainland Portugal 
(solid dark gray line), and the Canary Islands (thin black line). 
13 variables were used. The differences among the 
three areas shown by the MANOVA were also support¬ 
ed by the MANOVA performed on the otolith NEFDs. 
An overall successful classification rate of 73.3% in the 
canonical discriminant analysis was achieved for both 
sexes combined (Table 4). The highest classification 
rate was found for specimens from Peniche with 89.0% 
classification success, whereas specimens from the Ca- 
