K, my Nutrition Nazi got back to me and said this....
"Renee,
Tell them to get rid of it, never use it.
Salt will act as a preservative, and a good one, sort of, but, it dehydrates the food.
Fish have a hard time with this, and it will affect the kidneys, they drink salt water, and excrete it thru the gills and urine, adding more salt is bad.
The lovely long chain fatty acids will still break down at the same speed, but the water reduction will hold the fish from smelling for a long period, but its nutritionally unsound.
All in all, give it the flick."
Now, that's enough for me because I trust his expertise in this area, but I will continue to look into some studies to come of with more info for y'all.
If anyone else comes across some interesting reading, post it up!