Caridina serratirostris

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Version française
Wrote by Tipic, translated by Logow

Caridina serratirostris
De Man, 1892

Caridina serratirostris Synonyms :

  • Caridina serratirostris serratirostris Fujino, 1972
  • Caridina celebensis Holthuis, 1978

Common names :

  • Caridine serratulée
  • Crevette ninja
  • Ninja-Garnele
  • Ninja Shrimp
  • Marble Shrimp

See taxonomy

Origin : Indo-Pacific region; Madagascar, Philippine, Fiji, Japan, Indonesia, Malaysia, New Caledonia, French Polynesia, (The first descriptions issues thanks to collected specimens from the Lesser Sunda Isles in Indonesia south of Sulawesi)

Water specifications :

  • pH : 7 to 8
  • GH : 10 to 25
  • Temperature : 24 to 27 °C / 75.2 to 82.4 °F

Size :

  • Male : 2 cm
  • Female : 2.3 cm

Caridina serratirostris Description : Characteristic shape of the shrimps belonging to the Caridina genus, medium length rostrum, straight and very spiky. 19 to 26 spikes from which a long segment that comprises 6 to 8 spikes behind the orbits. The origin of the specie’s name comes from; serrati = spiky and rostris = rostrum. The background colouration is very variable and offers a panel of colours going from deep red, pink, orange, red to brown and black with some white or transparent areas. Caridina serratirostris The vernacular name of “Ninja Shrimp” is inspired by Ninja warriors from Japan who presented real aptitudes to been discreet and hide. This shy and small sized shrimp offers a very interesting range of colours.

Behaviour : Excellent gregarious specie that should absolutely live in groups of 6 individuals of the same specie. This very shy shrimp seems to appreciate shadows and dark areas. It will find refuge in nooks and crannies in the rocks or in thick plant like Ceratophyllum demersum , Ceratopteris cornuta or Java moss). This Caridina can be found, in its natural habitat, in turbulent waters, it can therefore be kept in tanks that offer currents and a good water movement. The morphology of this shrimp with its heavy body and short periopods is a good indicator that it lives in rough waters whereas it’s cousin Caridina gracilirostris is more adapted to calm waters.

Life span : around 18 months.

Feeding habits : Omnivorous with a strong vegetarian tendency favouring algae, it spends it’s time collecting algae on the rocks and plants found in its natural habitat. In tanks she doesn’t seem as fond of food as other little shrimps from the same type but will accept normal food without any trouble. A support with Java moss or Aegagropila linnaei will be much appreciated.

Sexual dismorphism : The females are generally larger than the males. On these, the internal appendage on the endopods of the first pairs of pleopods is missing.

Reproduction : This specie uses an indirect type of reproduction that comprises larval stages in salt water conditions. The complete development of the young to integrate benthic life goes through a few metamorphosis. The eggs are abundant and very small (0.35 à 0.5 mm). The protocol used for Caridina multidentata or Caridina gracilirostris is a good base to then adapt to the specific need of Caridina serratirostris.

Caridina serratirostris Specificity : The ninja shrimp has often been mistaken with Caridina celebensis initially described by De Man in 1892, the same publication year as Caridina serratirostris. The distinction between the two species is essentially based on the length of the stylocerite according to De Man’s works. This element varies depending on the populations of Caridina serratirostris and of Caridina celebensis, the distinction between the two species was questioned more than once. An article is being created on Crusta-Fauna to put in evidence the last element validating the status of these two species.

Links :

Works (Scientific litterature) :

  • Freshwater Shrimps of the family Atyidae (Crustacea : Decapoda : Caridea) from Peninsular Malaysia and Singapore, Y. Cai, P.K.L. Ng, S. Choy, The Raffles Bulletin of Zoology 2007 55(2): 277-309
  • Report on collection of freshwater shrimps (Crustacea: Decapoda: Caridea) from the Philippines, with descriptions of four new species, Y. Cai & S. Shokita. The Raffles Bulletin of Zoology, 54 (2) : 245-270.
  • The freshwater and terrestrial Decapod Crustacea of Pulau Tioman, Peninsular Malaysia, Darren C. J. Yeo, Yixiong Cai and Peter K. L. Ng. The Raffles Bulletin of Zoology 1999 Supplement No. 6: 197-244.

Sources (Bibliography) :

  • Sußassergarnelen aus aller Welt, Andreas Karge & Werner Klotz (page 89-90)
  • Atlas des poissons et crustacés de Polynésie Française, P.Keith, E.Vigneux & G. Marquet (page 42-43)
  • Aquarium à la maison N°63 Caridina serratirostris, Text Werner Klotz, photos Chris Lukhaup. Translated in French by B.Fournereau

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