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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

Rainbow trout

Oncorhynchus mykiss

Common name:

Rainbow trout

Scientific name:

Oncorhynchus mykiss


Rainbow trout are found in cold, well oxygenated water. Rainbow trout have been linked to the decline of some indigenous fish species.

Additional Info

  • Where does this species come from?

    North America.

    What is its invasive status in South Africa?

    Rainbow trout is not listed as an invader in any law in South Africa. Rainbow trout is proposed as a Category 2 invasive species in proposed amendments to the Alien Invasive Species Regulations (February 2018). These regulations have not been passed into law, to date.

    Where in South Africa is it a problem?

    Western Cape and highland regions of Gauteng, Mpumalanga, KwaZulu-Natal and Limpopo Province.

    How does it spread?

    They spread by swimming and establishing themselves in cold water rivers and under suitable conditions females will breed producing 2 000 to 3 000 eggs.

    Why is it a problem?

    Trout are efficient predators which prey on smaller fish species and threaten indigenous fish. They also feed on amphibians and invertebrates, leading to local declines.

    What does it look like?

    Description: Dark-olive in colour, shading to silvery-white on the underside with a heavily speckled body. A pink-red stripe is often present along their sides. This becomes most pronounced during the breeding season. The body profile is oblong and streamlined. In dams they can reach almost 70cm in length with a weight of 6kg, but in shallower rivers they seldom exceed 50cm and weigh around 1.5kg. Habitat: Found in fast-flowing, well oxygenated rivers and highland dams. They have a preference for clear, cold water. Breeding: Females produce 2 000 to 3 000 eggs. The eggs fall onto the gravel and between pebbles where they complete their development.

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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