"Orange shrimp" in an aquatic context most commonly refers to the Orange Sakura Shrimp, a popular and vibrant variety of the Neocaridina davidi shrimp species. These shrimp are known for their bright orange coloration, peaceful nature, and suitability for planted aquariums. Other orange shrimp varieties, like the Orange Rili Shrimp and Sunkist Orange Shrimp, are also popular choices for freshwater aquariums.