The source documents for stock assessment data (Appendix Table 3) for the period 1979–88 were searched for estimates of the values of F max and F 0.1 and those were used for the comparisons. Sometimes several estimates were available for one stock but these were averaged to give a single value.
The estimates of fishing mortality in the fishery were then recalculated to express the calculated F on the same basis as the
reference F, i.e. averaged over similar age groups in the same way.