Bought a few fish sauces recently - just opened one of the cloudier ones - a viet sauce Sai Gon brand Mam Nem (fish, salt, water). Can't find a pic online. Anyhow, when I just opened it, it spewed all over me and the countertop while I was talking on the phone.....like opening a shaken up coke. Can't do the smell test because, hey, it's fish sauce. I cannot find any compelling reason to not throw it out, unless someone replies "hey, that's normal." If it is still fermenting in the bottle, there's a problem I'm sure.