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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

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Triploid grass carp

Ctenopharyngodon idella

Common name:

Triploid grass carp

Scientific name:

Ctenopharyngodon idella

Alternative common names:

White amur

The grass carp is an herbivorous, freshwater fish species. It was introduced into South Africa from Malaysia and Germany between the years of 1967 and 1975. In large numbers, it can remove all aquatic vegetation from a body of water. If this happens valuable habitat for fish is lost which can cause fish population imbalances. 

Additional Info

  • Where does this species come from?

    Eastern Asia from the Amur River in Russia to the West River in southern China.

    What is its invasive status in South Africa?

    Triploid grass carp is not listed for dams within discreet catchments systems in which it occurs. NEMBA category 2 for release of triploid grass carp into dams in discrete catchments systems in which it does not occur. NEMBA category 2 for release of triploid grass carp into rivers, wetlands, natural lakes and estuaries in which it occurs. NEMBA category 3 in all rivers, wetlands, natural lakes and estuaries in which it occurs.

    Where in South Africa is it a problem?

    It was introduced into dams in KwaZulu Natal and the Mpumalanga provinces of South Africa and obviously there have been quite a few escapes and re-introductions as they are very well represented in many freshwater systems all over the country especially in the Vaal River.

    How does it spread?

    It was originally introduced into the country into farm dams to control the weed population.

    Why is it a problem?

    They are known to completely eliminate aquatic plants in introduced habitats altering trophic structure and inflicting widespread detrimental effects on ecosystems, They compete with native invertebrates and fish for food and other important resource and also carry diseases and parasites which are transmittable to other fish and are believed to be the main vector for Asian tapeworms

    What does it look like?

    Description: The body is rhombus with moderately large scales, while the head has no scales. There are three simple and seven branched rays on the dorsal fin. Grass carp are silvery to olive in colour, lacking the golden hue of common carp, and they have no barbells. This species typically reaches sizes of 30 to 36 kg’s in its native habitat, but individuals approaching 181 kg’s have been reported. Habitat: Includes large, slow moving or still water. Although they are often found in shallow streams and fast flowing rivers. They are very tolerant of temperature change and can withstand anything from 0-38 degrees! Breeding: They have a high reproductive potential some individuals sexually mature as early as 6 months of age. Litter size averages 6 piglets, but ranges from 3-8 piglets. Females can give birth twice in one year.

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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