Fishing densities (boat-meters/km²) :
▄ 0.005 - 0.01
▄ 0.01 - 0.05
▄ 0.05 - 0.1
▄ 0.1 - 0.5
▄ 0.5 - 1
▄ 1 - 5
▄ 5 - 10
▄ 10 - 130
