This increase in numbers could also be due to northern gannets benefiting from the growing activities of deep sea fishing.
en.wikipedia.org When a dive is successful, gannets swallow the fish underwater before surfacing, and never fly with the fish in their bill.
en.wikipedia.org Seabirds covered include the penguins, albatrosses and other petrels, tropicbirds, frigatebirds, gannets, cormorants, pelicans, skuas, gulls and terns, 104 species in all.
en.wikipedia.org Discards generally benefit surface feeders, such as gannets and petrels, to the detriment of pursuit divers like penguins.
en.wikipedia.org Dolphins herd the sardines into the shallows, where they come within reach of the diving gannets.
en.wikipedia.org