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Brazos Dwarf Crayfish (Cambarellus texanus)
Brazos Dwarf Crayfish (Cambarellus texanus)
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Description
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Description
Dwarf Crayfish
Brazos Dwarf Crayfish
A rare native dwarf crayfish from Texas — small, personable, and one of the few crayfish genuinely compatible with shrimp-safe planted setups.
Native Texas Species
True Dwarf — Under 2 Inches
Shrimp Compatible with Caution
Planted Tank Suitable
Highly Personable
Intermediate Keeper
The Brazos Dwarf Crayfish (Cambarellus texanus) is a rare, small-footprint crayfish native to the Brazos River drainage of Texas — one of the few truly dwarf Cambarellus species available in the hobby and among the most personable freshwater invertebrates you can keep. Adults max out under two inches, making them genuinely manageable in mid-sized planted aquariums where larger crayfish would cause destruction. They are active, curious, and surprisingly bold — moving confidently through hardscape, botanicals, and plant cover throughout the day, picking at biofilm, detritus, and food with the characteristic crayfish energy that makes them fascinating to observe. Housing with shrimp requires careful consideration — see the notes below — but in well-structured tanks with dense cover, peaceful cohabitation is achievable.
6.5–7.5
pH Range
GH 6–12
General Hardness
KH 2–6
Carbonate Hardness
65–75°F
Temperature
Appearance & Behavior Over Time
Small, well-proportioned body with warm earth tones — the Brazos Dwarf Crayfish typically displays brown, tan, and olive base coloration with darker mottling along the carapace and abdomen. Coloration varies between individuals and can shift subtly with diet, molt stage, and environmental conditions.
Genuinely dwarf — adults stay under two inches — unlike many crayfish sold as "dwarf" that grow to a problematic size, Cambarellus texanus remains small throughout its life. This is a true dwarf species, not a juvenile of a larger one, and its compact size is what makes it compatible with planted tank environments.
Active, curious, and highly visible — the Brazos Dwarf is not a hiding-only species. It spends significant time in the open, exploring hardscape, foraging across the substrate, and interacting with its environment in a way that makes it engaging to watch. Hideouts are used but not relied upon exclusively.
Molts regularly and requires mineral support — like all crustaceans, Brazos Dwarfs molt as they grow and after periods of stress. Adequate GH and KH support strong exoskeleton development. A freshly molted crayfish is soft and vulnerable — provide shelter and avoid disturbing the tank for 24–48 hours after a molt is observed.
Compatible with shrimp in well-structured tanks — with caveats — Brazos Dwarf Crayfish are significantly less aggressive toward shrimp than larger crayfish species, but they are opportunistic and will prey on shrimp they can catch, particularly during molts or in sparse tanks with little cover. Dense planting, mosses, and hardscape refuge reduce predation risk substantially. Adult Neocaridina in a densely planted tank cohabit reasonably well; shrimplets and small juveniles are at greater risk.
Prefers cooler temperatures — as a native Texas stream species, C. texanus performs best at the cooler end of the freshwater range. Temperatures above 75°F increase stress and reduce lifespan over time. Unheated or lightly heated tanks in temperate climates are often ideal.
How to Set It Up
Getting Started
1
Provide dense cover and multiple hideouts — driftwood, caves, and stacked rock give the crayfish secure retreats during and after molts, and reduce territorial conflict if keeping more than one. Dense planting and botanicals also provide the visual breaks and escape routes that make shrimp cohabitation more viable.
2
Use sand or smooth substrate — Brazos Dwarfs move across and occasionally dig in the substrate. Sand or fine gravel allows natural behavior without damaging the crayfish's underside or legs. Avoid very coarse substrate that can impede movement.
3
Maintain stable, slightly cool water — target pH 6.5–7.5, GH 6–12, KH 2–6, and 65–75°F. Consistency is more important than hitting specific values. Avoid temperature spikes above 76–78°F which cause stress in this species over time.
4
Feed a varied, sinking diet — sinking pellets, blanched vegetables, and occasional protein sources keep the crayfish well-nourished and reduce the motivation to actively pursue shrimp tankmates. A well-fed Brazos Dwarf is a significantly less predatory one.
💡 Bonus Tip
If keeping Brazos Dwarf Crayfish with shrimp, the single most effective precaution is dense, layered planting — particularly low mosses and foreground plants that create a ground-level refuge shrimp can dart into instantly. The crayfish simply cannot pursue shrimp efficiently through dense plant cover, and most cohabitation failures happen in sparse, open tanks where shrimp have nowhere to retreat.
Complete the setup with live plants
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Dense planting is the most effective way to create a balanced tank where dwarf crayfish and shrimp can coexist. Browse our Aquatic Plants collection.