Asian Fan Shrimp (Atyopsis moluccensis)

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Asian Fan Shrimp
Atyopsis moluccensis
Asian Fan Shrimp (Atyopsis moluccensis)
Name Asian Fan Shrimp
Name Lat. Atyopsis moluccensis
Synonym Atya moluccensis
Family Shrimps
Family lat. Atyidae
Order Decapoda
Order lat. Decapoda
Origin Southeast Asia
Habitat Streams
Diet Omnivore
pH 7.5-8.0
Behavior Peaceful
Keeping Group
Care Level Moderate
Reproduction Marine larval stages
Breeding Difficult
Life Span 6-8 years
Protection No
Metric Units
Size 7.0-8.5 cm
Temperature 18-26 °C
Hardness 5-15 °dH
Aquarium 50 l
US Units
Size 2.7"-3.3"
Temperature 64-79 °F
Hardness 89-267 ppm
Aquarium 15 gal

Distribution and habitat

The distribution area of the Moluccan mountain stream shrimp extends over the entire Southeast Asian region, from India over the Malay Peninsula to New Guinea. They prefer to stay on stones in fast flowing streams.


They require a well-structured aquarium with many roots, some robust plants, large stones and boulders, and strong current. The substrate of sand or gravel should be partially covered with foliage (e.g. sea almond leaves, oak leaves), rotting plant material and mulm.

No ammonia, ammonium and nitrite should be detectable in the aquarium water, the nitrate value should not exceed 100 mg/l. To ensure the water quality and oxygen content, a filter and heater adapted to the size of the aquarium is required, as well as lighting for the species-appropriate day-night rhythm of the animals. When choosing the filter, special care should be taken to ensure that the animals cannot be sucked in.


In nature, they filter detritus, zoo and phytoplankton, and tiny insect larvae from the water with their scissor legs formed into fans. They are easily fed with cyclops, daphnia, artemiauplia, microworms, spirulina and finely ground shrimp food supplemented with dried, crushed nettle, oak, beech and walnut leaves

Unaccepted food must be vacuumed up after 2-3 hours. Regular and varied feeding promotes health and prevents deficiency symptoms.

Behaviour and compatibility

They should be kept in a group of at least four. During the day they usually stay hidden. Due to their special feeding habits they are no danger for other shrimps or fish and are well suited for a community tank.

Basically, only compatible animals with similar demands on water quality and water temperature should be socialized.

Reproduction and breeding

Males have significantly larger anterior walking legs than females, whose abdominal carapace is extended downward.

Larval development takes 70 days and occurs in seawater at a salinity of 34 ‰ and a temperature of 26 °C. There are isolated reports of successful breeding.


The different appearing colorations might be origin-dependent. In the aquarium, especially after moulting, white specimens have also appeared. This probably happens as a result of missing trace elements

If the animals frequently scan the bottom with their fans, then they receive too little food in the current.

A socialization with crayfish is not recommended, because they could injure the shrimp after molting.

The well-being of the animals should be checked regularly. The temperature should be checked daily, the pH, hardness and nitrate value at least every 14 days. Regular partial water changes are recommended, even if the contaminant level has not yet reached the upper limit. Sudden changes in water quality should be avoided. Newly introduced animals must be accustomed slowly to the water in the aquarium.

Further literature can be found in your pet store.


Text: Christian Sänger; Image: Franz Lowak

Source KARGE & KLOTZ (2007): Süßwassergarnelen aus aller Welt, Dähne Verlag; ENGELMANN & LANGE (2011): Zootierhaltung - Tiere in menschlicher Obhut: Wirbellose, Verlag Harri Deutsch