Cherax boesemani care guide

About this species

Cherax boesemani was scientifically described by Lukhaup and Pekny in 2008. The original paper uses the subgenus name Astaconephrops; current taxonomic sources accept Cherax boesemani.

Red Papuan crayfish, Red Brick and Blue Moon are trade names, sometimes used for colour forms and sometimes imprecisely for other Papuan Cherax. Do not identify an animal by colour alone. Regional literature lists the species as Data Deficient (DD): information is insufficient to estimate extinction risk reliably. This does not mean the species is certainly safe.

Natural habitat

The original description is based on specimens from the shores of the Ayamaru Lakes in the Kais River drainage, West Papua, Indonesia. A 2021 regional review also lists the Amajaru Lakes and Kais drainage. The available records are limited and should not be turned into a broad range estimate or a fixed aquarium recipe.

The regional literature identifies overfishing and habitat degradation as broader concerns for Papuan Cherax. No reliable population trend is established for this species. Choose traceable captive-bred stock, and never release crayfish, eggs, aquarium water or wet equipment into natural waters.

Aquarium and layout

A specialist species profile advises budgeting about 100 litres per crayfish and describes serious fights between adult males. This is practical guidance, not an experimentally established minimum. Treat 100 litres as a cautious planning value for one animal, not a guarantee or stocking rule. Additional animals need much more floor area and separate retreats; cohabitation should only be considered in a spacious aquarium with several independent territories.

Provide multiple sturdy caves and visual barriers, including around moulting. Fit a secure lid and close gaps around hoses and cables because crayfish can escape. Guard the filter intake and provide dependable filtration and oxygenation.

Water conditions

Species-specific aquarium profiles differ widely. One specialist gives 15–28 °C and pH 6.8–8.5; a separate retailer lists 20–26 °C and pH 6.5–7.5. We use the narrower overlap, 20–26 °C and pH 6.8–7.5, as a practical starting zone, not a proven biological boundary. These are aquarium recommendations, not controlled tolerance trials. Reliable GH and KH limits were not found.

Stability matters more than quickly chasing one number. Maintain good filtration and oxygenation, with ammonia and nitrite undetectable. Do not change temperature or pH abruptly.

Behaviour and group size

Aquarium profiles describe the species as generally manageable, but adult males may fight seriously. Allow ample floor space, visual barriers and several caves per animal. A single crayfish in a closed species aquarium is easiest to manage. No controlled trials establish a particular fish pairing as safe for this species.

Small, resting or weakened animals may be at risk. Do not assume fish or shrimp are automatically safe tankmates. Check for injuries, especially after moulting, and ensure each animal can retreat fully.

Feeding

Cherax boesemani is omnivorous. Species-specific aquarium information lists both animal aquarium foods and plant matter; a regional review describes scavenged material, detritus and predation among Cherax. Offer small portions of sinking invertebrate food and suitable plant matter. Remove leftovers to protect water quality.

The live product catalogue was checked read-only. No food product could be verified sufficiently for ingredients and suitability for this species, so no branded product is linked.

Breeding

A specialist species profile describes aquarium breeding: the female carries eggs beneath her abdomen, and juveniles leave her only when developed. The same profile reports cannibalism among young crayfish. These are aquarium observations, not guaranteed clutch sizes or schedules.

Provide many small refuges and biofilm-rich surfaces. A separate rearing aquarium can reduce losses but cannot ensure survival. Keep scientific identification and provenance with any breeding stock.

Keeping with fish

The neon tetra (Paracheirodon innesi) is rated discouraged as a precaution. A species profile reports that C. boesemani may reach about 15 cm, while a neon tetra is small. No controlled pairing trial was found. The sources therefore do not prove routine predation on healthy neon tetras, but they also do not support recommending this pairing as safe. A species aquarium is more predictable.

Keeping with other invertebrates

Evidence is insufficient to link particular shrimp or snails as safe. Allow for predation risk to vulnerable small animals and avoid using this as a breeding aquarium where losses are unacceptable. The linked Anubias is conditional only: an attached plant may provide structure, but Cherax may eat plant matter and damage remains possible.

Do not use plants treated with pesticides harmful to crayfish. A plant relationship here is not a guarantee that the plant will remain undamaged.

Exoskeleton, shell and minerals

During and after moulting the crayfish is vulnerable. It may retreat; leave it undisturbed and prevent other crayfish from entering the same shelter. Leave the old shell while water quality remains good; it may be eaten. An empty moulting shell is normal and does not mean the animal has died.

Repeated failed moults call for checks of water stability, oxygen, diet, metals such as copper and available refuges. Never correct water values abruptly.

Possible problems

Main risks include escape, fighting in an undersized aquarium, vulnerability around moulting and water pollution from uneaten food. Use a secure lid, guard hoses and filter intakes, and provide separate caves. Check medicines and plant treatments for crustacean safety; copper can be harmful.

DD is a knowledge gap, not reassurance. Keep provenance records and prevent release into outdoor waters. For injuries or repeated moulting problems, first check water quality and setup and consult an experienced crayfish specialist.