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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

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Cherax tenuimanus

Common name:


Scientific name:

Cherax tenuimanus

Alternative common names:

Hairy marron, Margaret River marron. 

Marron are large, freshwater crayfish which can grow to more than 380mm in length. They are one of the largest freshwater crayfish species in the world, with specimens having been recorded in excess of 2kg. They have tufts of hair-like bristles on their carapace and other body surfaces.

Additional Info

  • Where does this species come from?

    Western Australia.

    What is its invasive status in South Africa?

    NEMBA Category 2.

    Where in South Africa is it a problem?

    Western Cape.

    How does it spread?

    It is spread in running water and through intentional introductions for aquaculture.

    Why is it a problem?

    They compete with indigenous species.

    What does it look like?

    Description: This hairy-shelled species has jet black pincers and a paler olive-green to brown body. The underside is brown and females have areas of red colouration on the underside and some splashes of purple. 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. They have a pair of large pincers at the front end and four pairs of walking legs. Habitat: This species is found in deep, freshwater rivers on sandy stretches with plenty of organic matter. Breeding: Marron breed in spring during their second year of life. The number of eggs produced per individual ranges from 90-900 and is dependent on the size of the female. Eggs are carried by the female beneath its tail (pleopods) for a period of 12-16 weeks, whereafter they hatch and undergo two development stages. After this period, free swimming larvae resembling the adults are released.

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General News Updates

2019 National Symposium on Biological Invasio…


This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training


During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group


Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?


On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released


Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised


The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more