Image related to website content

Sights unseen: finding the hidden secrets of the Grootvadersbos rivers

17 Aug 2020

Thanks to an ongoing project funded by the Table Mountain Fund, CapeNature’s aquatic biologists Dr Martine Jordaan and Ms Jeanne Gouws are collaborating with the Grootvadersbos Conservancy to unearth the fishy secrets from the rivers of the Tradouw and Duiwendhoks catchments.

Image related to website content

Grootvadersbos Conservancy borders the Grootvadersbos Nature reserve and the Langeberg Mountain Catchment Area (MCA) and is home to a number of mountain tributaries. Due to the mountainous terrain, these streams have, until very recently, been unexplored in terms of aquatic biodiversity.

Joint field surveys are ongoing and to date a number of new distribution localities for native fish have been recorded. The native fish compliment of the area comprise the Breede river redfin, the Cape kurper and the Cape galaxias, all three of which are endemic to the Cape Fold Ecoregion. From a biodiversity perspective these records are very important as the majority of the freshwater fish species of the Western Cape Province is highly threatened and at risk of extinction in the future. The main threats to freshwater fish are loss of habitat due to poor land use practices, pollution, water abstraction and predatory invasive fish species. Many of rivers associated with the conservancy originate on either Grootvadersbos Nature Reserve or the Mountain catchment area and through good land use practices the conservancy is aiding in the conservation of these very species fish in off-reserve areas.

Image related to website content

Scientific outcomes of the project include the collection of DNA samples and voucher specimens for researchers working at the South African Institute for Aquatic Biodiversity and collecting data for use in Red List Assessments. The project also has a strong focus on human capital development and in-field training in fish survey techniques is provided for the conservancy staff. While baseline sampling is still ongoing, the vision is to set up a collaborative long term monitoring program between staff from CapeNature and the Conservancy.

Share:

Related News

An adult Clanwilliam sawfin one of the hosts of the newly discovered Paradiplozoon jordaanae
25 Jun 2026
Newly discovered species named after CapeNature Ecologist, Dr Martine Jordaan

A newly described Paradiplozoon species has been named after CapeNature Fauna Ecologist, Dr Martine Jordaan, in recognition of her knowledge and passion for the aquatic life of the Cape Fold Ecoregion, continuous enthusiasm to study the region's fishes and understanding their parasitofauna. The newly identified species – Paradiplozoon jordaanae – is named after Dr Jordaan.

Rocherpan
11 Jun 2026
CALL FOR APPLICATION FOR EXTERNAL MEMBER OF THE AUDIT AND FINANCE COMMITTEE

Applications are hereby invited for candidates to serve on the Audit and Finance Committee of CapeNature.

The member shall be independent from CapeNature, be contracted for a maximum period of two terms of three years each and will be remunerated for attendance at meetings.

Closing date for applications: 3 July 2026

Impact of Inclement Weather in May 2026 displaying road damage
4 Jun 2026
Impact of Inclement Weather across CapeNature Reserves in May 2026

The last bout of extreme weather began in early May, when a cut-off low-pressure system hit the Garden Route. A week later, two powerful cold fronts swept through the rest of the Province, unleashing torrential rains and gale-force winds. The result has been widespread damage, with 85% of all reserves reporting at least some form of damage. The Cederberg region has emerged as the hardest hit.

Huis River aquatic invertebrate survey
3 Jun 2026 by Lonwabo Mkosi and Dr Martine Jordaan (Biodiversity Intelligence)
Huis River aquatic invertebrate survey strengthens partnerships for freshwater ecosystem conservation

In the upper reaches of the Huis River near Barrydale, a recent aquatic macroinvertebrate survey is helping to inform conservation decisions for the Critically Endangered Tradouw redfin (Pseudobarbus burchelli), including the potential expansion of its range into upstream habitats in the river. The survey was conducted in partnership with

Critically Endangered Tradouw redfin fish
3 Jun 2026 by Dr Martine Jordaan & Lonwabo Mkosi (Biodiversity Intelligence)
Ongoing efforts to safeguard the Critically Endangered Tradouw redfin through monitoring

The Critically Endangered Tradouw redfin (Pseudobarbus burchelli) is one of South Africa’s most range-restricted freshwater fishes. It is endemic to the Huis–Tradouw River catchment near Barrydale in the Western Cape. The species is listed as Critically Endangered due to its small and fragmented distribution, threats from invasive fish species, pollution, water abstraction, and habitat degradation.

Anton Bredell Western Cape Minister of Local Government Environmental Affairs and Development Planning
3 Jun 2026
Western Cape Government Prepares for Midweek Storm

Anton Bredell, Western Cape Minister of Local Government, Environmental Affairs and Development Planning, today said that the Provincial Disaster Management Centre had been briefed by the South African Weather Service (SAWS) on a cut-off low-pressure system expected to affect the Central Karoo and eastern parts of the Garden Route on Wednesday and Thursday this week. According to SAWS, the cut-off low-pressure system is expected to bring heavy rainfall, strong winds