Yamatonuma shrimp
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Yamatonuma shrimp ( Caridina multidentata ) |
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| Stimpson , 1860 |
The Yamatonuma shrimp ( Caridina multidentata , Japanese 大 和 沼 蝦 , Yamato numaebi , " Yamato freshwater shrimp", syn .: Caridina japonica ), also called Amano shrimp or Japanese freshwater shrimp , belongs to the genus Caridina from the family of freshwater shrimp (Atyidae ). It is very popular in the aquarium hobby.
designation
Caridina multidentata has long been known as Caridina japonica . When it was recognized that this name is an older synonym , the species name was changed in accordance with the International Rules for Zoological Nomenclature to the name Caridina multidentata assigned in the first description , because the first validly published name takes precedence ( priority rule ). Sometimes, however, the outdated designation can still be found (e.g. in retail) today.
Appearance
The body of the Yamatonuma shrimp is slightly translucent. There are points arranged in a line on the sides. Depending on the humic acid content in the water, the shrimp can also take on a slightly reddish brown appearance. The shrimp reaches a maximum length of 5 centimeters (whereby the males usually remain a little smaller). Their lifespan in the aquarium is up to 8 years.
Distribution area and food spectrum
The Yamatonuma shrimp comes from the southern part of central Japan . It lives in rivers there, but the newly hatched larvae are washed into the sea and only migrate back up the rivers when they have reached a length of at least one centimeter. The Yamatonuma shrimp is therefore dependent on seawater for reproduction. Reproductive successes described in the aquarium literature for keeping in freshwater aquariums probably refer to a different but very similar looking species that is native to eastern Taiwan . In their habitat, the Yamatonuma shrimp is omnivorous.
Aquaristics
The keeping of the Yamatonuma shrimp was mainly made known by the Japanese aquarist and photographer Takashi Amano , which is why this type of shrimp is also sold under the name Amano shrimp . Since algae are the main food of shrimp, they are often used to combat algae in the aquarium. The pebbles of the ground, up to about 0.5 mm, are taken up by the shrimp and the algae are eaten off all around. The pelvic panes are not cleaned because they cannot hold on to the glass.
breed
In the case of shrimps, a distinction is made between the primitive and the viviparous, specialized reproductive type. Unlike, for example, the crystal red dwarf shrimp , which belongs to the specialized reproductive type, the Yamatonuma shrimp is assigned to the primitive reproductive type. Finished, small shrimp are not born, but rather small larvae hatch from the eggs and go through various stages of development. It is not possible to breed the Yamatonuma shrimp in a pure freshwater aquarium, as these larvae need salt water to grow into adult shrimp. In the wild, these shrimp are found in freshwater areas. They also release the hatched larvae where they are carried into the sea with the current. There the larvae develop into ready-made shrimp and then migrate back to the freshwater area. The egg-bearing females should be separated into another aquarium as early as possible. After the larvae hatch, the mother animal should be removed from the tank and the water should be salted up so that the larvae have the opportunity to survive the larval stage and the mother animal is not exposed to excessive salt concentrations. After the larvae hatch, the shrimp shed their skin almost every day because the chitin shell does not grow with them. The young shrimps also feed on algae, but can also be fed Artemia nauplii or powdered food. Depending on the feeding and water temperature, they can be converted into fresh water after about 40 days.
Web links
- Caridina multidentata inthe IUCN 2013 Red List of Threatened Species . Posted by: De Grave, S., Shy, J. & Cai, X., 2011. Retrieved January 20, 2014.
Individual evidence
- ↑ crustakrankheiten.de ( Memento from January 3, 2011 in the Internet Archive ): About shrimp breeding