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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

Silver carp

Hypophthalmichthys molitrix

Common name:

Silver carp

Scientific name:

Hypophthalmichthys molitrix

Alternative common names:

Silwerkarp (Afrikaans)

The silver carp is a deep-bodied fish that is laterally compressed. They are a very silvery in colour when young and when they get older they fade from a greenish colour on the back to silver on the belly. These fish were introduced from Germany in 1975 to the Marble Hall experimental fish farm on the Olifants River. Silver carp compete with indigenous species such as yellowfish for habitat and resources.

Additional Info

  • Where does this species come from?

    Originates from China, being one of the most cultured fish in China due to its quick growing rates as well as the hardiness to withstand harsh conditions.

    What is its invasive status in South Africa?

    NEMBA Category 1b.

    Where in South Africa is it a problem?

    They occur mainly in the Olifants and Limpopo River systems (including the Kruger National Park); where they tend to congregate in slow flowing water or pools below rapids.

    How does it spread?

    These fish were introduced from Germany in 1975 to the Marble Hall experimental fish farm on the Olifants River. A Complete Guide to the Freshwater Fishes of Southern Africa (Skelton, 1993), cites Israel as the country from which they were imported. Some fish escaped into open waterways and have dispersed into the Olifants and Limpopo River systems, including the Kruger National Park. Floodwaters are known to disperse the fish into new areas.

    Why is it a problem?

    Silver carp compete with indigenous species such as yellowfish for habitat and resources.

    What does it look like?

    Description: The silver carp is a deep-bodied fish that is laterally compressed. They are a very silvery in colour when young and when they get older they fade from a greenish colour on the back to silver on the belly. They have very tiny scales on their body but the head and the opercles (gill cover) are scaleless. They have a large mouth without any teeth in the jaw, but they have pharyngeal teeth. Silver carp have a large head with a small mouth and medium eyes set below the level of the mouth. These fish grow to 1m in length and weigh up to 50kg. Habitat: Silver carp live in freshwater in temperate to subtropical climates (6 to 28 °C). They are commonly found in impoundments or backwaters of large, slow flowing rivers, lakes or dams. Breeding: Silver carp generally reproduce during the spring or summer. Reproduction is primarily cued by increased water temperature.

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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