Ninja, Marbled Shrimp
Caridina serratirostris

The Ninja Shrimp can change color as and when they like, color varies from red, orangey-red and black. When stressed, they will usually change to red or orangey-red. The body is irregularly colored and sometimes called "Marbled" shrimps in aquarium shops. Some strains of the Ninja Shrimp have reddish eyes. The origin of the Ninja Shrimp seems to be Japan and it is very popular there, probably due to the association of the name of the shrimp to Japan.