|Wrote by Get63, translated by Logow|
Common names :
Origin : North Africa, Spain, Italy, Corsica.
Historically, this specie is present from North Africa to Southern Europe, but it is expanding its territory thanks to all the new man made water ways. It is now found up to Holland (recorded in 1915 for the first time), also in Austria and in the Danube (1994).
Millet described it for the first time in 1831, by sampling some around Angers, where it was well acclimated.
Reproduction for this specie, implicated a pelagic larval stage -possible in freshwater-, is favourable to the expansion of the geographic zone of this specie, as larva are moved by currents. It also seems that it is capable of fixing itself to ship hulls on which it finds algae suitable for their food and therefore travelling like that.
Water specifications :
- pH : 7 to 8.5
- GH : 5 to 20 with some preference for values above 6
- Temperature : 2 to 30°C (ideal 25°C) / 35.6 to 86°F (ideal 77°F)
Size : maximum 3 cm for males and 4 cm for females with a weight varying from 137 to 250 milligrams
Description : Atyaephyra desmaresti has a long body with a transparent colouration with a few black, green or brown lightly marked ; you can however find a blue based colouration. It also has long antennas and very developed eyes and tinted green. The spike sequence on the rostrum is variable depending on the geographic location where they are sampled : we read that the number of spines on the top side if from 16 to 18 , on the bottom side the number is around 6 and on the lateral sides it goes from 20 to 25 spikes.
Natural habitat : Not present in granitic mountain areas, this shrimp likes rivers and favours them with little current (rivers, canals) , and usually lowland waterways posses and abundant plant cover on their edges which explains that they need a well oxygenated habitat to be maintained.
Behaviour : This calm, gregarious specie will be able to live in a community tank, care must be taken however regarding potential predators, it is best to avoid large fish as cohabitants. Atyaephyra desmaresti is principally a nocturnal shrimp, it is also during the night that moulting is done every 15 to 30 days. e
Life span : 12 to 24 months
Feeding habits : Omnivorous, feeds on mostly algae and decaying matter.
Sexual dismorphism : Female are larger than males and have bigger pleopods under their abdomen to attach their eggs to.
Reproduction : Reproduction is of indirect type, with 8 different larva stages out at sea. This shrimp can carry up to 1500 eggs, during the 20 or 30 days of incubation depending on the temperature. These eggs are between 0.4 and 0.6mm in diameter.
A specific maintenance tank will be necessary to achieve protection from predators for the larva and considering its origins ,a period of hibernation might be necessary to bring reproduction to term. It seems that matting season is situated between April and end of August. The index available on Wirbellose.de specifies the the larva born in June where 6mm long and that at the end of the year, males measured 20mm and females 22mm.
Specificity : This shrimp is difficult to identify due to its chromatic abilities, it is good to also take note that it is found in brackish and fresh water conditions , which shows a great adaptability potential. Concerning any commercial transactions for this shrimp they are for our knowledge inexistent in France.
- D.O.R.I.S. : Atyaephyra desmaresti
- Laboratoire BFE de l’Université de Metz : Atyaephyra desmaresti
- Morphological varation in Atyaephyra desmaresti (Millet, 1831) within and among population over its geographical range, Ch. Anastasiadou and al., Medit. Mar. Sci., 5/2. 2004, 05-14. (pdf)
- Atlas du Dr.Pez : Atyaephyra desmaresti
- Wirbellose : Atyaephyra desmaresti
- Crusta Fauna : index Palaemonetes varians
- Crusta Fauna : Differenciate A. desmaresti and P. varians
Sources (Bibliography) :
- Süßwassergarnelen aus aller Welt, Authors : Andreas Karge & Werner Klotz, p 112