All canned tuna used as an ingredient in Sainsbury's own-label products will be caught using the pole-and-line method by the end of this month, the retailer has announced.

Sainsbury's moved cans of standard own-label tuna to pole-and-line in 2009 and is now switching to the method for canned tuna sold in products such as sushi, sandwiches and ready meals.

The rollout of more sustainably sourced tuna products comes ahead of Greenpeace's publication of its latest canned tuna league table next week.