John West, the UK’s largest seller of tinned tuna, has been ranked bottom of an environmentally-friendly tinned tuna league table published by Greenpeace today, due to the use of destructive fishing methods used to catch its tuna. New research shows that John West tinned tuna is often caught using ‘fish aggregation devices’, or FADs, responsible for wiping out thousands of sharks and turtles every year – including some rare and threatened species.