The River Shrimp is a common name of feeding shrimp. They are found in estuary's and venture up rivers. They need brackish or salt water to survive longer. These shrimps are offered as live food, not as shrimps to keep in your tank for a long period. If you have predatory fish like larger cichlids, channa, puffers, large wild betta, etc. then they are a nutritious food for them and a good bit of fun to chase about. Feeding live River Shrimp is a great way to get any of the larger freshwater or marine fish to feed. The shrimps are safe to feed your fish.
Also many customers feed these shrimps to there various Terrapins / Turtles including Musk Turtles, Map Turtles, Yellow Bellied sliders etc along with various Amphibians such as larger Frogs / Toads and Axolotls etc A portion is between 7 & 10 Shrimps depending on the size Larger towards 7 Smaller towards 10.