While there is so much salt in fish sauce that it probably never really expires, fermentation continues in the bottle and as a result, the flavor can degrade over a long period of time. Yes, high grade fish sauce is made by aging it for 2 years, so it should get better with age right? Not exactly as those were in controlled conditions. Im looking to order several bottles of Megachef fish sauce, but not so much that some are no longer of quality by the time I use them. Unfortunately, I have to have them imported from Australia as the prices for Megachef here are wayyyy too expensive. I can get them for $8 for the big bottle (700 mL) in Australia vs. $45 here.