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Japanese swamp shrimp, Amano shrimp, and the Yamato numa-ebi, all refer to the same great algae eater, Caridina japonica. Without a doubt, Caridina japonica is one of the best algae eaters for a freshwater aquarium. Unfortunately, the distribution of these shrimp is limited to only a handful of Asian countries. Lately many of these great shrimp are showing up in North America.
Description:
Caridina japonica can reach a length of almost 2 inches (5cm) from nose to tail. Body color consists mostly of a light brown opaque color. On the back carapace, there is a tan stripe that runs from the head down to its tail. On the shrimp's side flanks, are a series of broken lateral lines that are a reddish-brown in color. The tail also contain two or more black and white dots.
Diet:
Caridina japonica has been known to eat almost every kind of algae known to the aquarist. But Yamato numa-ebi are finicky when it comes to how much, and of what type of algae to eat. One algae that Yamato numa-ebi do not like, is the dreaded black beard algae. Nevertheless, when they are hungry they will gnaw away at some of it. These shrimp are most active at night, but seem to do a decent job during the day, also. Even if there is an abundance of algae in the tank, I have observed these shrimp taking fish food from the surface of the water. In rare cases,
Caridina japonica has even been known to eat plants. I have witnessed them eat my nice lawn of Riccia, due to the fact that the shrimp I had bought were bagged for two days with nothing to eat. Along with eating some living plants and algae, Yamato numa-ebi will also eat detritus in the form of dead plant leaves and leftover food.
Care:
Japanese swamp shrimp are very tolerant when it comes to water type. Since they come from swamps, they can also tolerate different salinity. Another parameter that is tolerated by these shrimp is pH. Amano, and I, use these shrimp, and our pH is about 6.5 with the use of Aqua Soil. Since
Caridina japonica originate from a swampy/marsh region with brackish condition, I would guess that a pH well above 7 is also fine. These shrimp have been known to live up to three years in captivity. I personally have had one for nearly two years. Two things to point out, the Yamato numa-ebi are very sensitive to ammonia/ammonium, and heavy metals. Heavy metals will interfere with the shrimp's molting process causing them to die. Ammonia and ammonium are just simply poisonous to all living things.
Almost all Cichlids will take a liking to these shrimp, meaning they will eat them. There is only one kind of Cichlid that I know that does not har
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