Friday 24 May
Hairy marron (Cherax tenuimanus)
What’s the World’s Favourite Species?Find out here.
Hairy marron fact file
- Find out more
- Print factsheet
Hairy marron description
One of the largest freshwater crayfish in the world, this hairy-shelled species has jet black pincers and a paler olive-green to brown body. The hairy marron's (Cherax tenuimanus) underside is brown and females have areas of red colouration on the underside and some splashes of purple (3). The head and internal organs of all crayfish are protected by the carapace and the six segments of the abdomen are individually encased with a flexible membrane between them to allow movement. Crayfish have a pair of large pincers at the front end, followed by four pairs of walking legs and then four pairs of small swimming legs called swimmerets. These swimmerets are covered with fine hairs to which the female attaches her eggs. A central tail flap is surrounded by four other flaps that are used to move the crayfish rapidly through the water, as well as curling up to form a brood chamber in females. There are two eyes on the end of eyestalks, but the senses of touch and taste are far more important. These are perceived using a pair of large feelers (or antennae) and a pair of small, fine, centrally located feelers (or antennules) (3).
- Also known as
- Margaret River marron, marron.
- up to 2 kg (2)
The Government of Western Australia, Department of Fisheries website:
- In arthropods (crustaceans, insects and arachnids) the abdomen is the hind region of the body, which is usually segmented to a degree (but not visibly in most spiders). In crustacea (e.g. crabs) some of the limbs attach to the abdomen; in insects the limbs are attached to the thorax (the part of the body nearest to the head) and not the abdomen. In vertebrates the abdomen is the part of the body that contains the internal organs (except the heart and lungs).
- Pair of sensory structures on the head of invertebrates.
- The top shell of a turtle or in arthropods (insects, crabs etc), the fused head and thorax (the part of the body located near the head) also known as ‘cephalothorax’.
- Litter formed from fragments of dead material.
- A species or taxonomic group that is only found in one particular country or geographic area.
- An organism that feeds on both plants and animals.
- Gelatinous jelly cone with a sperm cap deposited by a male during courtship.
IUCN Red List (May, 2011)
Government of Western Australia, Department of Fisheries (June, 2005)
State of Victoria, Department of the Natural Resources and the Environment (May, 2005)
Australian Government, Department of the Environment and Heritage (May, 2005)
Australian Government, Rural Industries Research and Development (May, 2005)
- view the contents of, and Material on, the website;
- download and retain copies of the Material on their personal systems in digital form in low resolution for their own personal use;
- teachers, lecturers and students may incorporate the Material in their educational material (including, but not limited to, their lesson plans, presentations, worksheets and projects) in hard copy and digital format for use within a registered educational establishment, provided that the integrity of the Material is maintained and that copyright ownership and authorship is appropriately acknowledged by the End User.
Hairy marron biology
Hairy marrons require the correct light levels, water temperature and diet for breeding. Mating at the start of spring, the male passes a spermatophore between the female’s final pair of walking legs. The female uses this to fertilise her eggs, incubating between 200 and 300 of them on her swimmerets for 12 to 16 weeks. When carrying eggs, females are said to be ‘berried’ due to the appearance of a bunch of berries on each swimmeret. The eggs hatch into pre-juveniles in early summer and become mature adults within a year (2).
Hairy marrons do not burrow to escape drought like other freshwater crustaceans and are comfortable on land for short periods. They are omnivorous, feeding on detritus and other small organisms found on the detritus (2).Top
Hairy marron range
The marron was split into two distinct species in 2002, when it was realised that some individuals were hairy (Cherax tenuimanus) and others were smooth (now known asthe smooth marron, Cherax cainii). The newly-named hairy marron is endemic to the Margaret River in southwest Western Australia (4).Top
Hairy marron habitat
The hairy marron is found in the permanent freshwater tributaries of forested high-rainfall areas (5).Top
Hairy marron status
The hairy marron is classified as Critically Endangered (CR) on the IUCN Red List (1).Top
Hairy marron threats
Having previously thought that the smooth marron (Cherax cainii) and the hairy marron (Cherax tenuimanus) were the same species, people translocated the smooth marron in large numbers into Margaret River. It is now known to out-compete the hairy marron in regions where the river habitat is degraded due to loss of vegetation or poor water flow (5). The hairy marron has suffered an 80 to 90 percent reduction in numbers due to the human-induced invasion of the smooth marron (4). Other introduced species are also thought to be contributing to the hairy marron’s decline (5).Top
Hairy marron conservation
The Western Australia Department of Conservation and Land Management is working together with the Department of Fisheries and the public to develop and implement a recovery plan for the hairy marron. In addition, the importation of non-native crayfish species is banned in Australia to prevent the spread of the crayfish plague fungus that has been responsible for the decline of several European crayfish species (2).Top
Find out more
For further information on the hairy marron:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.
Terms and Conditions of Use of Materials
Copyright in this website and materials contained on this website (Material) belongs to Wildscreen or its licensors.
Visitors to this website (End Users) are entitled to:
End Users shall not copy or otherwise extract, alter or manipulate Material other than as permitted in these Terms and Conditions of Use of Materials.
Additional use of flagged material
Green flagged material
Certain Material on this website (Licence 4 Material) displays a green flag next to the Material and is available for not-for-profit conservation or educational use. This material may be used by End Users, who are individuals or organisations that are in our opinion not-for-profit, for their not-for-profit conservation or not-for-profit educational purposes. Low resolution, watermarked images may be copied from this website by such End Users for such purposes. If you require high resolution or non-watermarked versions of the Material, please contact Wildscreen with details of your proposed use.
Creative commons material
Certain Material on this website has been licensed to Wildscreen under a Creative Commons Licence. These images are clearly marked with the Creative Commons buttons and may be used by End Users only in the way allowed by the specific Creative Commons Licence under which they have been submitted. Please see http://creativecommons.org for details.
Any other use
Please contact the copyright owners directly (copyright and contact details are shown for each media item) to negotiate terms and conditions for any use of Material other than those expressly permitted above. Please note that many of the contributors to ARKive are commercial operators and may request a fee for such use.
Save as permitted above, no person or organisation is permitted to incorporate any copyright material from this website into any other work or publication in any format (this includes but is not limited to: websites, Apps, CDs, DVDs, intranets, extranets, signage, digital communications or on printed materials for external or other distribution). Use of the Material for promotional, administrative or for-profit purposes is not permitted.