The Amano shrimp ( Caridina multidentata syn. C. japonica ), also called japonica shrimp , is a species of shrimp common in the aquarium hobby. It owes its common name to Takashi Amano, one of the creators of aquascaping.
Caridina multidentata has a translucent, greyish, greenish to brownish body, passing through blue on the upper part of the head, the coloration varying depending on the environment and the diet. Several rows of dark dots ("dots" for males and "lines" for females) run parallel across the body, from head to tail. A lighter, whitish, opaque line runs across the back from head to tail, sometimes highlighted by a darker line on either side.
This shrimp has no claws. Its size varies from about 4 to 5 cm , the males remaining smaller and thinner than the females. The latter have a large cavity formed under the abdomen by the pleopods , where the eggs incubate before the larvae are expelled. In males, pleopods do not form a cavity under the abdomen. (wikipedia)