UK upmarket retailer Marks & Spencer (M&S) is launching an interactive map that shows customers and stakeholders where every type of seafood it sells is either caught or farmed.

The map is the first website of its kind from any major UK retailer and includes information on the capture or farming method and sustainability information for every fishery or farm.

A total of 47 different species -- including fish or shellfish used as an ingredient in products like sandwiches, salads and prepared meals -- are plotted on the map as well as 71 fisheries and 29 different sourcing countries.