freshwater shrimp vs saltwater shrimp as food

I was in a local grocery store the other day picking up squid and tilapia for my rays when I noticed "freshwater shrimp" for sale in the freezer section. It is farm raised somewhere in Asia. I have always fed shrimp to my rays but it (the shrimp) has been of the saltwater variety. I recently switched shrimp brands from farmed raised shrimp to a wild caught product from the Gulf of Mexico.
It seems most frozen seafood products (including the freshwater shrimp I mentioned above) contain sodium tripolyphosphate to preserve the product. Would there be any advantage to feeding the freshwater shrimp to my rays rather than the shrimp I currently feed now? They all have added salt.

Brent said:

i dont think there would be any benefit ... also ive noticed the freashwater shrimp are more expensive and tears apart easier making a mess in the tank thats what i dont like about them the ones here are big so the rays shred them up ....

Click to expand...

Thanks. Will stick with the shrimp I feed now.

motoro magic said:

I feed my rays frozen prawns from the supermarket and give them an occasional treat of live river shrimp (brakish water) and they totally destroy the live and will hunt every inch of the tank to make sure there are none left. I dont know if there are any different benefits to feeding fresh water shrimp but i know which my rays prefer.

Click to expand...

I have fed live river shrimp (caught in brackish water too) and the rays really like them. Caught many today at work but didn't bring any home. Next time though.