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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

Brown trout

Salmo trutta

Common name:

Brown trout

Scientific name:

Salmo trutta

Alternative common names:

Finnock, peal, mort, and white trout (English).

Brown trout have a streamlined, spindle-shaped  body which is silver to olive-brown, yellow, with small scales and covered with large reddish-brown spots. In South African dams, this species can grow up to 75 cm in length and over 6 kg in weight, whereas in rivers, smaller specimens are found. This fish feeds on invertebrates, insect larvae, flying insects, and molluscs, as well as fish and frogs.

Additional Info

  • Where does this species come from?


    What is its invasive status in South Africa?

    Brown trout is not listed as an invader in any law in South Africa. Brown 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?

    Southern and Eastern Cape, the Drakensberg in KwaZulu-Natal and highland areas of Mpumalanga and Limpopo Provinces.

    How does it spread?

    Self-sustaining populations are known from several river systems but they are sensitive to water quality and not as widespread as the rainbow trout.

    Why is it a problem?

    Brown trout have been linked to the decline of indigenous fish to predation and competition, most notably the Maloti minnow (Pseudobarbus quathlambae) in KwaZulu-Natal.

    What does it look like?

    Description: Brown trout have a streamlined, spindle-shaped body which is silver to olive-brown, yellow, with small scales and covered with large reddish-brown spots. It is a medium-sized fish, growing to 6kg or more and a length of about 75cm. They grown larger in dams and smaller in rivers. It has a very small scales and small fins. Habitat: Brown trout form stream-resident populations, typically in high-altitude streams, but sometimes in large rivers. They are more likely to be found near submerged rocks & logs, undercut banks, and overhanging banks. They can also be found in heavy and strong currents. They are sensitive to water quality and prefer cold, mountain streams and rivers. Breeding: A typical female produces about 2,000 eggs per kilogram of body weight when spawning. Breeds in autumn or early winter.

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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