Brazos dwarf crayfish care
Cambarellus texanus
The Brazos dwarf crayfish, Cambarellus texanus, is a small freshwater crayfish from Texas. Its scientific name helps avoid confusion with other dwarf crayfish and trade names. The original description and a U.S. government screening describe shallow standing waters with vegetation and ditches that may dry out. This informs habitat, not aquarium limits. Hobby sources differ in their recommendations, so this guide gives only a cautious overlap and no unsupported minimum tank volume. Provide plenty of shelters, a secure lid and stable water quality. The species may behave opportunistically toward small animals.
Plan your aquarium →At a glance
- Temperature
- 20–26 °C
- pH
- 7.0–8.0
- Diet
- Omnivore
- Adult size
- Approximately 3–4 cm
- Temperament
- Territorial
About this species
Cambarellus texanus was scientifically described from Texas in 1973. WoRMS places it within Cambarellus (Pandicambarus). Common names such as Brazos dwarf crayfish and Texas dwarf crayfish do not replace verified species identification. The government screening assigns an uncertain ecological invasion-risk category; this is not an extinction-risk assessment or population estimate.Natural habitat
The original description documents Texas localities including shallow, grassy ditches with temporary water. The USFWS screening mentions vegetated standing-water ditches and burrowing during dry periods. These are field observations. Conditions in such habitats do not automatically define safe or optimal aquarium parameters.Aquarium and layout
Set up open floor area with several small shelters and sturdy structures. A precise minimum volume is not sufficiently supported, so none is stated. Prevent escapes with a tight-fitting lid and protect filter intakes. Use mature biological filtration and maintain good oxygenation. A species-only aquarium is the most predictable choice around animals the crayfish could catch or that could injure it.Water conditions
Specialist hobby sources give differing values. Their cautious overlap is 20–26 °C and pH 7–8; these are care recommendations, not proven biological tolerance limits. Keep water stable, with ammonia and nitrite undetectable, and avoid abrupt changes. A specific hardness range was not sufficiently confirmed.Behaviour and group size
This small crayfish lives mainly on the bottom and may defend shelters. Opportunistic behaviour and territorial interactions can occur even in a small species. Provide several hiding places, observe after introduction, and separate animals if chasing, injury or unexplained losses occur. A species-only setup is the most predictable.Feeding
Hobby profiles describe an omnivorous diet. Offer small portions of suitable sinking invertebrate food alongside plant matter. Remove leftovers to protect water quality. No product from the existing catalogue is linked: both composition and suitability for this species could not be confirmed sufficiently.Breeding
The original field description records egg-bearing females at several collection times, but it is not a controlled aquarium-breeding study. It cannot establish a dependable breeding season or guaranteed outcome. Give a brooding female peace and cover. Juveniles need fine shelters and can be vulnerable to larger tankmates or filter intakes.Keeping with fish
The neon tetra (Paracheirodon innesi) is discouraged as a default tankmate. Small fish may be at risk around an opportunistic crayfish, particularly while resting or weakened. This is a precautionary assessment, not a controlled trial of this exact pair.
Keeping with other invertebrates
Attached Anubias is suitable conditionally as sturdy structure, but plant damage remains possible. Avoid materials or treatments that may leave copper residues. This exact pairing has not been tested in a controlled study.
Exoskeleton, shell and minerals
During moulting the crayfish retreats and is vulnerable. Leave it undisturbed and do not immediately remove a shed exoskeleton; it may be eaten. Provide shelters and stable water. If problems recur, check oxygen, water quality and any copper-containing treatments.Possible problems
Watch for escapes, shelter disputes, predation on small tankmates and confusion caused by trade names. Verify the scientific name when buying. Never release animals, eggs, aquarium water or wet equipment into nature. The USFWS “uncertain” label belongs to an ecological risk screen, not a Red List status.Keeping with other species
Neon tetra
Not recommendedDiscouraged as a default pairing: small fish may be at risk around an opportunistic crayfish. This is a precautionary assessment; the pairing has not been tested.
View species profile →Suitable plants
Dwarf Anubias
Conditional: attached Anubias adds structure and is less exposed to digging, but damage remains possible. This exact pairing has not been tested.
- Light
- Low, Moderate
- CO₂
- CO₂ injection not needed
Sources & review
This care guide draws on several specialist sources and was last checked on .
View the sources
- The Southwestern Naturalist — Albaugh & Black (1973), A new crawfish of the genus Cambarellus from Texas
- U.S. Fish and Wildlife Service — Ecological Risk Screening Summary: Brazos Dwarf Crayfish
- World Register of Marine Species — WoRMS taxon list: Cambarellus
- Garnelio — Texanus dwarf crayfish: care profile
- Wirbellosen-Aquarium — Texanischer Zwergflusskrebs
- Interaquaristik — Texanischer Zwergflusskrebs: species listing
- Aquatic Arts — Blue Brazos dwarf crayfish: care notes