Most store-bought stock/broth packaging contains some claim like "refrigerate after opening, and use within 7-10 days". My bottle of clam juice makes no claims whatsoever about refrigeration or shelf life. I know it contains some salt, but I doubt it's enough to preserve it indefinitely.
Since it's basically a stock/broth, I assume it would last about as long as an opened container of chicken stock - just long enough for bacteria to establish their own civilization, complete with a "Salmonella Starbucks" on every suspended particle.
Does anyone know for sure? Can I put an opened bottle back in the cabinet? Will it last a week in the fridge? Should I just pour out any unused juice, because it will spoil so quickly?