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Encyclopedia / Crayfish & Crabs / Boesemani crayfish
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Variations

1 kinds · tap one for a closer look

Boesemani crayfish

Cherax boesemani · Blue lobster (boesemani), Cherax boesemani

Semi-aggressive; best alone.

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12 cmAdult size ✓
UnknownTemperature ?
UnknownpH ?
UnknownSmallest tank ?
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This one is best kept on its own, or with its own kind.

✕Not recommended
  • Boesemani crayfish eats animals up to about 4 cm. Neon tetra only grows to 2.5 cm.
✕Not recommended
  • Boesemani crayfish eats animals up to about 4 cm. Cardinal tetra only grows to 3 cm.
✕Not recommended
  • Boesemani crayfish eats animals up to about 4 cm. Black neon tetra only grows to 3.2 cm.
Facts checked against sources on 16 Oct 2026. ✓ means a source backs it; ? means no reliable source yet. See sources

Care and water

Hardness ?Unknown
Group size ?Can live alone
Temperament ?Semi-aggressive
Swims at ?Bottom
Care level ?Moderate
Diet Omnivore
Lifespan ?Unknown
Size in shops 3–6 cm
Growth Medium

Behavior

Semi-aggressive; best alone.

Check your local laws. EU: not on the Union list of invasive alien species (only Cherax destructor of this genus). US: Florida lists Cherax boesemani as a prohibited species (no personal possession or commercial use); Washington State prohibits all Parastacidae crayfish except Engaeus, C. quadricarinatus, C. papuanus and C. tenuimanus. Never release. Check the rules where you live before you buy one, and never release it into the wild.

Food

Pellets, vegetables and meaty foods.

Tap a food to see what it is.

Male or female

Adult males have a soft, pale yellow or white patch (decalcified swelling) on the lower edge of the claws; females lack it. Young males resemble females until it develops (at about 8 cm total length).

Health

Common problems. Tap one to see the signs. This is a guide, not a diagnosis.

Breeding

Egg-bearing mating pairs · Moderate

Direct developer: the female carries eggs under her tail. One wild 9.6 cm female carried 74 eggs (3 x 2 mm); a berried female was collected in early March.

Pairing

One male and 2 females in a large tank with hides.

Setup

Large tank with caves and sand; separate female when berried.

What starts it

Seasonal temperature changes and good feeding.

Eggs

One 9.6 cm wild female carried 74 eggs, each about 3 x 2 mm.

Raising the fry

Juveniles are tiny crayfish; feed meaty foods and keep separate to prevent cannibalism.

Common mistakes
  • Mixing males
  • Too little cover
  • Poor water quality
Full breeding guide, day-by-day plan and simulator →

Where it lives in the wild

Rainbowfish riversLoading the map…
Native range (rough area)Centre of the rangePlaces on the World Map
RegionBird's Head Peninsula, West Papua, Indonesia
Rivers and lakesAyamaru Lakes area
HabitatClear lakes and connected streams
Native rangeAbout 100 km across
Open on the World Map

The story of the boesemani crayfish

A very variable crayfish from the Ajamaru Lakes of West Papua, Indonesia, described in 2008. Wild colours range from beige, olive and brown to reddish brown and purplish red, with bright blue legs; the claws vary (blue-green, purple or blue with orange-yellow). Selective breeding has produced strains sold as "Supernova", "Blue Moon", "Red Brick" and others.

Described in 2008 by Christian Lukhaup and Reinhard Pekny, this crayfish shares its home region with the famous Boeseman's rainbowfish. Its vivid orange-and-blue forms made it a popular collector's crayfish.

First described by Christian Lukhaup & Reinhard Pekny in 2008. Named for Named after Dutch ichthyologist Marinus Boeseman.

  • Both this crayfish and Boeseman's rainbowfish honour the same scientist.
  • Its colour forms range from orange to blue-purple.
  • It comes from one of the most biologically rich regions of New Guinea.

Sources

9 facts checked with sources

  • Scientific name

    Invertebrate (freshwater crayfish, family Parastacidae, New Guinea). Cherax (Astaconephrops) boesemani Lukhaup & Pekny, 2008, named after M. Boeseman, who collected the type specimens in 1955. Trade names include "Supernova", "Blue Moon"/"Blue Marble", "Red Chilli", "Red Brick Papua"; hybrids with C. pulcher are sold as "Thunderbolt Blue Moon" (Wikipedia). Not the rainbowfish Melanotaenia boesemani (separate file species-boesemani.json).

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed) · USFWS Ecological Risk Screening Summary: Cherax boesemani (2017), citing GBIF
  • Familycorrected

    Legacy has no family; recorded as sourced.

    Wikipedia: Cherax boesemani (cites IUCN Red List: Austin 2010)
  • Size

    Total length. Largest type male 12.3 cm, female 10.3 cm (preserved). Wikipedia gives 13-15 cm, citing a hobby site only. size-pick: the pulcher paper (Lukhaup 2015, citing Lukhaup & Pekny 2014) says C. boesemani "reaches a TL up to 25 cm", far above every other figure, so not used. Legacy 12 cm kept.

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed) · Wikipedia: Cherax boesemani (cites IUCN Red List: Austin 2010)
  • Where it livescorrected

    Legacy has no range; recorded as sourced. About 22 km from the C. pulcher locality (Lukhaup 2015).

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed) · Wikipedia: Cherax boesemani (cites IUCN Red List: Austin 2010)
  • Male or femalecorrected

    Legacy claw-size/tail cues not sourced; this subgenus character is the clear sign.

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed)
  • Breeding

    Legacy "Females carry 30-100 eggs" is consistent with the single wild count of 74. No aquarium breeding source fetched.

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed)
  • Eggs and youngcorrected

    Legacy breeding.eggs text gave no count; incubation time unsourced.

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed)
  • Storycorrected

    Legacy "blue-green body and orange claws" describes only one colour type.

    Lukhaup & Pekny 2008, Zool. Med. Leiden 82: 331-340, Cherax (Astaconephrops) boesemani, a new species (peer-reviewed) · Wikipedia: Cherax boesemani (cites IUCN Red List: Austin 2010)
  • traits.legalcorrected

    US state rules as quoted by USFWS (2017); not re-checked on current FWC/WDFW pages. No US federal listing found. German national rules not checked.

    Wikipedia: List of invasive alien species of Union concern (summarises EU Reg. 1143/2014 implementing lists 2016/1141 to 2025/1422) · USFWS Ecological Risk Screening Summary: Cherax boesemani (2017), quoting Florida FWC prohibited species list