Caridina japonica is a very popular shrimp among planted aquarium keepers. In the 1980s, the famous Japanese Aquascaper, Takashi Amano, first introduced this algae eating shrimp to his planted aquariums. From then on, the Cardina japonica (recently reclassified to Caridina multidentata) has become known as the Yamato or Amano Shrimp, and is currently a common shrimp species found in planted aquariums.
Caridina multidentata can be found throughout Asia, specifically on the Japanese islands, Ogasawara Islands, Taiwan, Korea, Fiji and Madagascar. Contrary to popular belief that these shrimp live in dense riparian vegetation, Caridina multidentata is actually found in slow flowing areas of rivers and streams, next to larger boulders and rocks.
Caridina multidentata is one of the larger freshwater shrimp available to hobbyists, reaching a maximum length of two inches. It has a translucent/gray coloration with black/reddish spots covering the sides of its body. It does well in a larger variety of water conditions, however it favors water temperatures of 68-75 degrees Fahrenheit.
General Shrimp Care
Caridina multidentata are an extremely fun and useful shrimp to have in your aquarium. They will eat most types of algae including Blackbeard Algae, Green Hair Algae, and Cladophora. However, to be effective algae eaters, Caridina multidentata are best kept in groups of 5 or more per 10 gallon aquarium. Caridina multidentata are docile and can be with kept with fish and other shrimp.
Caridina multidentata are very difficult to breed because the larvae (eggs) will not "hatch" in freshwater. These shrimp will develop eggs in freshwater conditions, however, they require a brackish water (saltwater) environment to "hatch" the eggs. Once hatched the post-larvae, miniature shrimp, are transferred into freshwater where they will develop and grow into living adults. Caridina multidentata will not interbreed with the Red Cherry Shrimp (Neocaridina denticulata sinensis), or Crystal Red shrimp (Caridina cf. cantonensis).
Photo Credit: Leanna Brezina