Harlequin Crayfish

Cherax pulcher, described scientifically only in 2015, rapidly became one of the most coveted freshwater crayfish in the hobby due to its extraordinary iridescent patterning. Juveniles display blue, red, orange, and yellow hues across the carapace that intensify and shift depending on lighting angle and water conditions — no two individuals look exactly alike.

Native to the Teminabuan area of West Papua in Indonesia, this species inhabits clear, moderately warm freshwater streams over rocky substrate. In aquaria it does best in large, well-structured tanks with caves, rocks, and root structures that replicate its natural environment. Water quality must be maintained at high standards to preserve its remarkable coloration.

Despite its delicate appearance, C. pulcher is moderately hardy once established. It can be kept in male-female pairs for breeding, but males are territorial and will fight if two males are housed together. Pairs should be given a very large tank with multiple visual barriers.

Water: 22–28°C, pH 7.0–8.0, GH 6–15, KH 3–10; consistent clean water essential to maintain colouration. Tank: minimum 120 L, rocky caves, driftwood, dim lighting enhances iridescence; avoid plants. Feeding: omnivore — high-quality sinking pellets, blanched vegetables, occasional frozen bloodworm. Breeding: male-female pairs; female broods eggs under pleopods; juveniles independent from birth. Compatibility: aggressive toward conspecifics; keep one per tank or as M/F pair with dividers available.