At the request of the Tshwane Nature Conservation, full technical and ecological assessments were conducted on the Bronkorstspruit Dam.

Types of water grass and reeds found in the Dam are problematic and the situation will deteriorate further as some fish species that could contain the grass and reeds were not present or small in numbers, in the netting of the specimen fish species and re - introduction of other species of fish balance can be restored.

As noted from the Technical and Ecological Assessment results, short and long term actions need to be taken in order to address the imbalances of the dams’ eco-systems.

In order to redress the balance of the fish species found, certain species in dams will need to be drastically reduced, and other species introduced. The impact of netting out and re-stocking is expected to take 2 to 5 years, and will create a number of jobs in the process.

We are not just removing the fish but also replacing the right balance of fish so that the eco-system will have and maintain a balance not only for a short term but also for the future of the surrounding eco-system. By netting we are not only restoring the right balance of aquaculture but also removing unwanted algae and grass.


Fish Species not present

Fish species to be removed


Fish species to be Introduced

Redbreast Tilapias


Redbreast Tilapias

Banded Tilapias

Canary Tilapia

Mozambique Tilapias

Ghieliemientjies – Barbs


 Ghieliemientjies - Barbs

Dwarf Tilapias


Dwarf Tilapias

Mosquito Fishes


Banded Tilapias

Grass Carps


Mosquito Fishes

To view the full report please follow the link:

Below are some pictures to show the Rehabilitation of the dams’ aquaculture (fish species):


Bronkhorstspruit Dam Rehabilitation Program