Freshwater Fish Survey in the Garden Route
CapeNature Fauna Ecologist Dr. Martine Jordaan recently collaborated with the South African Institute for Aquatic Biodiversity (SAIAB) research group on a field trip to the river systems of the Garden Route. Dr. Albert Chakona and Prof Paul Skelton, freshwater fish experts at SAIAB have focused on resolving redfin taxonomy for the past decade, and their work has resulted in the description of several new redfin species.
The Western Cape Province is located in the Cape Fold Ecoregion, home to a group of fish known as the redfins or rooivlerkies. Except for one species, redfins are endemic to the Cape Fold Ecoregion. Ongoing research indicates that most redfin species have high levels of genetic and morphological diversity between populations and that this divergence may be enough to warrant the status of separate species.
The survey aimed to collect voucher specimens and DNA samples to use in the description of two new redfin species in the rivers of the Garden Route. The two candidate species belong to the redfin genus Pseudobarbus and were discovered through recent genetic studies, but to date, there are no formal species descriptions for these taxa.
The biological material collected during this survey will enable the completion of formal species descriptions. CapeNature will build on this process by collecting additional distribution data to enable an accurate conservation status assessment of these taxa once they are described.
The most recent National Biodiversity Assessment (2018) indicates that freshwater fish are the most threatened vertebrate group in the country. South Africa is diverse in terms of having several distinct aquatic ecoregions, each with its own freshwater fish fauna.
Dr Albert Chakona and Dr Pedro Braganca sampling in the Homtini River in search of the elusive redfins of the Garden Route.
Successful sampling makes for happy researchers and good collaborations: Drs Pedro Braganca, Albert Chakona and Martine Jordaan celebrating collecting the specimens that will be used for describing a new redfin species for the Western Cape. Photo by Prof Paul Skelton
Related News
Wildfires intensify as climate shifts, CapeNature warns in emergency podcast series
CapeNature has released a special series of its acclaimed Green Noise podcast, offering an urgent and deeply human perspective on South Africa’s recent wildfire season. The series has a particular focus on the devastating fires in the Cederberg Wilderness and changing weather patterns. The fire in the Cederberg Wilderness, which ignited on 22 December 2025 along Uitkyk Pass
Western Cape to benefit from CapeNature’s 2026 Greening Initiative
CapeNature is launching a fun and engaging greening competition for schools and communities across the Western Cape. The competition will start on 13 April 2026 to coincide with International Plant Appreciation Day and will run until 15 May 2026. The initiative aims to inspire learners and community members to actively participate in protecting the environment.
A follow up: The potential impacts of Red Swamp crayfish in Western Cape waters
Since first being found in the canal systems of lower Olifants River in 2022 by CapeNature officials, invasive Red Swamp Crayfish (Procambarus clarkii) are being found further afield in the Western Cape at an alarming rate. This freshwater species is globally recognised as a seriously damaging invasive species.
Over 43 000 Cape Gannets on Lambert’s Bay Bird Island this breeding season
Bird Island is alive with the sounds and spectacle of seabirds, with an estimated over 43 000 Cape Gannets currently making the island their home this breeding season. The thriving colony reinforces Bird Island, Lambert’s Bay, as one of South Africa’s most important gannet breeding sites and highlights the impact of ongoing marine conservation work.
Water Week: Protecting Our Most Precious Resource
Water is fundamental to life and essential to our daily wellbeing. While this may seem widely understood, it remains important to continually remind ourselves of the value of this finite resource. Although approximately 70% of the Earth’s surface is covered by water, only about 2.5% of it is freshwater available to sustain ecosystems and human needs.
New SASS accreditor supports river biomonitoring in the Western Cape
CapeNature continues to strengthen its role in freshwater conservation through the expertise of its staff, with freshwater ecologist Jeanne Gouws receiving her South African Scoring System (SASS) accreditation as an accreditor. Having successfully passed every three-yearly assessment since 2007, she is now the official Western Cape SASS accreditor.