192 
Fishery Bulletin 95(2), 1997 
However, if the spatial-temporal features of spawn- 
ing of this species in this area are taken into account, 
the results of Alvarez and Butler ( 1992), cited above, 
cannot be considered to be based on an unbiased sam- 
pling of the 1988 recruitment because they were de- 
rived from two samples only. 
2 - 
8 9 10 11 12 13 14 
Total length (cm) 
Figure 4 
Ageing precision for juveniles of the Atlanto-Iberian sardine Sardina pilchardus within 1-cm length 
ranges. Precision is defined as the standard deviation divided by the mean (CV). 
