Many migrating Fraser sockeye (both outbound as young smolts and inbound as mature fish) pass some two-dozen salmon farms in the Broughton Archipelago.

Bighead and silver carp - both native to Asia - have been migrating toward the lakes since escaping from Deep South fish ponds and sewage treatment plants in the 1970s.

Our earliest ancestors learnt how to judge when the seasons would change so that crops should be planted, fish would be plentiful, or when migrating herds would pass some local point.