Agar Supply, New England’s largest independent food distributor, has partnered with Legal Sea Foods to launch a new label that will allow restaurants and supermarkets to track fresh fish all along the supply chain. Legal Sea Foods wholesale division, Nor’Easter, will supply nearly all of the fresh fish marketed under Agar’s “Nautifish’’ brand, including haddock, cod, salmon, and tuna. Nor’Easter will use new technology to create a barcode on each package that will include details such as when the seafood was caught, who caught the product, what region is was caught in and when the seafood was prepared for packaging.