The smooth marron, Australia's premium freshwater crayfish and the third-largest freshwater crayfish in the world — and the honest truth about farming it in the tropics.
📅 Last reviewed: September 2026
Cherax cainii (smooth marron; formerly classified as C. tenuimanus)
Endemic to southwestern Australia, marron is the largest farmed freshwater crayfish after the Tasmanian giant — WA government sources record individuals over 400 mm and 2 kg. Renowned for sweet, firm meat and a premium restaurant price. It is a temperate species: growth slows above ~24°C, so it suits cool-water regions, not lowland tropics.
Marron commands the highest live prices of any farmed freshwater crayfish — a niche, high-value market with limited supply and strong restaurant demand.
Marron are slower-growing but calm, non-burrowing, and less aggressive than many crayfish. Low stocking densities in earthen ponds with good water flow are the proven model.
Western Australia has a mature, export-oriented marron farming industry with decades of grow-out, hatchery, and marketing know-how you can study and adapt.
This is the species you buy as broodstock or juveniles. It was formerly classified as C. tenuimanus until genetic work split the two, which is why older books and even some current sellers still use the old name. The WA government describes it as the third-largest freshwater crayfish in the world, reaching over 400 mm and 2 kg. Widely licensed for aquaculture in Western Australia.
The true tenuimanus is the critically endangered hairy marron of the Margaret River region. It is not farmed, is protected by law, and must never be sold as stock. When buying marron, always confirm the scientific name reads Cherax cainii — a seller listing plain "C. tenuimanus" is either out of date or selling the wrong animal.
The honest answer: usually not — but there are exceptions.