Neocaridina palmata
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Neocaridina palmata , color form "gray-brown marble shrimp " |
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| ( Shen , 1948) |
Neocaridina palmata is a freshwater shrimp species . It comes in four color forms. They are known as "gray-brown marble shrimp", "orange-red nectarine shrimp", "blue Hong Kong shrimp" and "white pearl shrimp". The white color variant is a cultivated form that was sometimes referred to as Neocaridina cf. zhangjiajiensis because itlooks similar to thespecies Neocaridina zhangjiajiensis described by Cai in 1996.
features
Neocaridina palmata is up to 2.8 inches long. The animals can practically not be distinguished from the back shrimp ( Neocaridina davidi ) with the naked eye . The clearly developed internal appendix on the masculine appendix of the endopod as well as the inner branch of the first pair of swimming legs are clearly visible under the microscope and thus enable a distinction. The internal appendix is wedge-shaped at the base and the masculine appendix has many thorns. In the second pair of swimming legs, the internal appendix extends almost to the distal end of the masculine appendix. The endopod is 1.5 to 2.1 times longer than it is wide. There are 12 to 16 thorns on the uropod fold. In the female, the rostrum extends to the distal end and in the male to the middle of the base segment of the antenna pair. The rostrum formula is 2–5 + 8–16 / 2–8.
The term "white pearl shrimp" for the white cultivated form refers to the eggs stored in the body, which look like small white pearls. Due to the slightly transparent body color of the shrimp, the development of the eggs can be easily observed. The eggs are first formed in the neck area of the female animals and later migrate under their belly, where they are carried between the swimming legs. During the repositioning, the eggs are fertilized. The fertilized eggs carried under the belly then ripen for about three to four weeks until the young hatch. It happens that new eggs are clearly visible in the back area, while older eggs are carried under the stomach. White pearl shrimp live up to 2.5 years and can reach a body size of up to 25 millimeters. The first unfertilized eggs can already be seen in not yet fully grown females from the age of 10 to 12 weeks and about 15 mm in length.
Systematics
There are four known subspecies. (As of October 7, 2007)
- Neocaridina palmata bosensis Cai , 1996
- Neocaridina palmata luodianica Liang , 2004
- Neocaridina palmata meridionalis Liang , 2004
- Neocaridina palmata palmata ( Shen , 1948)
Aquaristics
Neocaridina palmata are sometimes kept and bred in aquariums . They are described by the keepers as problem-free animals that are tolerant of various types of food (special shrimp food, leaves of certain tree species) and can be kept at room temperature. Sea almond leaves are reluctant to eat, walnut leaves are eaten within a few days. Dead conspecifics are also preferred to be eaten. They are sensitive to pathogenic microorganisms, which is why regular water changes are necessary, especially on warm days, and the snail population should be kept as small as possible, as these are typical intermediate hosts of the microorganisms.
Web links
- Neocaridina palmata inthe IUCN 2013 Red List of Threatened Species . Posted by: De Grave, S., 2013. Retrieved February 17, 2014.
Individual evidence
- ↑ Andreas Karge, Werner Klotz: Freshwater shrimp from all over the world. 3rd, revised and expanded edition. Dähne, Ettlingen 2013, ISBN 978-3-935175-90-6 , pp. 134-136.
- ↑ Article Neocaridina palmata on crusta-fauna.org ( Memento of the original dated February 22, 2014 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , As of October 7, 2007
