Greenpeace protests against retailers' seafood sourcing, which began as far back as 2005, are well-publicized.

In the latest, in Spain last week, organizers strung a huge 16-meter inflatable fish skeleton on the front of a Madrid outlet of Auchan-owed retailer Alcampo.

The group protested for more transparency in the chain’s seafood policy.

Greenpeace told IntraFish although it resorts to these measures when dialogue breaks down, it will seek to reward retailers that show a commitment to sustainable seafood and help promote its efforts.

“Sometimes