The centres of gravity of the total fishing effort for the different management regimes (F = 0.1 to F = 0.4 and open access) and smartness values (s = 1–10) are shown in Figure 11. Agglomerative hierarchical clustering (Lukasová, 1979) level three is shaded and the horizontal axis measures the dissimilarities between clusters in terms of squared Euclidian differences.