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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Danube crayfish

Astacus leptodactylus

Common name:

Danube crayfish

Scientific name:

Astacus leptodactylus

Alternative common names:

Galician crayfish; Turkish crayfish; narrow-clawed crayfish.

Typical crayfish body form with telson (tail) and pincers. The body colouration is usually pale yellow to pale green in colour and the sides of the thorax are very rough. This crayfish averages 15cm in length, but may reach 30cm long. This crayfish is invasive in lakes in Europe and may negatively affect South African wetland systems.

Additional Info

  • Where does this species come from?

    Caspian Sea.

    What is its invasive status in South Africa?

    NEMBA Category 1a.

    Where in South Africa is it a problem?

    Not yet known to occur in South African waters.

    How does it spread?

    Through waterways.

    Why is it a problem?

    This crayfish is invasive in lakes in Europe and may negatively affect South African wetland systems.

    What does it look like?

    Description: Typical crayfish body form with telson (tail) and pincers. The body colouration is usually pale yellow to pale green in colour and the sides of the thorax are very rough. This crayfish averages 15cm in length, but may reach 30cm long. Habitat: Lakes and freshwater dams. Breeding: Mating in Europe begins in the middle of December and eggs were observed in the middle of January. Female crayfish carry the eggs in specialised flaps on the abdomen and embryonic development lasts between 4-5 months. Larvae emerge when water temperatures are higher during summer.

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General News Updates

2019 National Symposium on Biological Invasio…

26-02-2019

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

22-01-2019

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

04-09-2018

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?

01-03-2018

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

28-02-2018

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

25-01-2018

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