Macrobrachium dayanum

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Wrote by Aquatech, translated by Logow

Macrobrachium dayanum
(Henderson, 1893)

Macrobrachium dayanum
Synonyms :

  • Palaemon dayanus Henderson, 1893

Common names :

  • Kaira river prawn
  • Red dusty
  • Ringelhangarnele
  • Shoko Garnele
  • Crevette chocolat

See taxonomy

Origin : South of India, Bengal gulf, Kaira river.

Carte Macrobrachium dayanum

Water specifications :

  • pH : 6.5 to 7.5
  • GH : 4°
  • KH: 2°
  • Temperature : from 20 to 30°C / 68 to 86 °F

Size :

  • Male : 9 cm
  • Female : 7 cm

détail du 3e segment Description : Characteristic shape of the shrimps belonging to the Macrobrachium genus, massive rostrum in the medium length range and spiked according to the following formula : 1-3+4-8/3-7, the claws are very developed. The colouration goes from light brown to red, with a dark brown half circle at the back of the third segment. The claws are a much more intense brown.

Macrobrachium dayanum sur un cadavre de poisson Behaviour : Aggressive and territorial, they must be kept in groups in tanks with a minimum of 80cm x 30cm in area., on dominant male will quickly take the lead. At the opposite of the type of aggressivity shown to his competitors, he will be gentle with juveniles and berried females, pushing it to the extreme of leaving his hideout to them. Cohabitation is possible with smaller shrimp species like Neocaridina heteropoda heteropoda var Red, as well as small sized fish (ex: Hyphessobrycon eos, Hyphessobrycon amandae, Rasbora brigittae). The Macrobrachium dayanum are very good gravediggers and will take care of any casualties amongst fish in a community tank , however they will shun other shrimp carcasses. When it comes to plants no damage has been observed.

Life span : not determined.

Feeding habits : Omnivorous, the Macrobrachium dayanum collects its food directly on the floor. It will take any of food without problems like flakes, bottom tabs for fish or crustacean, frozen food, but shows a very clear preference to white worms.

un couple Sexual dismorphism : The males are larger than females and have massive claws. The colour in males is more intense, the abdomen is thinner than in the females who have lengthened segments towards the bottom to offer protection to the eggs that are held by the pleopods (swimmerets located under the abdomen).

oeufs jaunes Reproduction : Mating takes place at whatever time during the day, and is referred to as T. shape mating. The male places himself perpendicularly to the female and stops her from moving by deploying his claws on either side of her. The eggs are yellow in colour and change to black in 24 hours. It’s and indirect reproduction type : the complete development of the young require a single larval stage in fresh water conditions, we call this a semi-shortened reproduction. The young are transparent with a few red specks on the claws. Breeding in captivity of this specie has already been accomplished. The complete cycle lasts around 5 to 6 weeks. oeufs noirs Larve de M. dayanum

Specificity : Macrobrachium dayanum is considered as belonging to the “hendersoni” group, that comprises a few species from which Macrobrachium assamense assamense, relatively well known by aquarists passionate about shrimps. The important resemblance between these two species makes identification difficult without and in depth examination of their morphological differences. The combination on the rostrum, the shape of the claws and the proportions of the different segments composing the periopods are a few elements allowing the distinction between these two species. This group is made up by the Macrobrachium using semi-shortened reproduction in fresh water conditions.

Links :

Sources (Scientific literature) :

  • Hydrobiologia 487 :59-83, 2002. Par Yixiong Cai & Peter K.L. Ng

Sources (Bibliography) :

  • Sußassergarnelen aus aller Welt, Andreas Karge & Werner Klotz (page 136)

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