Clanwilliam Yellowfish
The Clanwilliam Yellowfish is a large, gold-coloured cyprinid found nowhere else on earth except the Western Cape's Olifants-Doring river system.
Endemic, vulnerable, and genuinely difficult to fool, it has become the fly-fishing obsession of Cape anglers the way brown trout captivate highland fishers — clear water, selective feeding, and fish that can push 10 kg in the right pools.
Scientific Name: Labeobarbus seeberi
Also known as Cape Yellowfish, Geelvis
- Adults are a warm gold to light brown overall; juveniles are silvery with blotchy dark barring on the flanks — easy to confuse with the co-occurring Clanwilliam sawfin until the gold colouration develops.
- Males intensify to a deep golden-yellow during the breeding season, which is where the common name comes from.
- A typical adult runs 40–60 cm; fish above 70 cm are noteworthy, and the species tops out near 98 cm and just over 10 kg.
- Thick-bodied, with a subterminal mouth suited to bottom-feeding — the lips are fleshy and slightly downturned, distinguishing it from more predatory species.
What to know
Habitat Distribution
- Strictly endemic to the Western Cape: found only in the Olifants-Doring River System (ODRS) and its mountain tributaries in the Cederberg region.
- Key rivers include the Doring, Biedou, Boskloof, Driehoeks, Groot, Jan Dissels, Kobee, Noordhoeks, Ratels, Rondegat, and the Twee River — all Cederberg-area streams feeding the Olifants.
- Prefers well-oxygenated, moving water — deep pools, fast runs, and the broken water below rapids. Has adapted to impoundments but needs flowing water to spawn.
- Populations in the Olifants River mainstem have declined sharply; above Clanwilliam Dam and below Olifants Gorge the fish has largely disappeared.
Key Locations
- Ratels River (Cederberg) — a tributary of the Olifants holding healthy populations, more accessible than the upper mainstem and a good starting point.
- Rondegat River (Cederberg) — well-regarded among fly anglers for clear water and sight-fishing opportunities to good-sized fish.
- Groot Winterhoek Wilderness area — remote upper Olifants tributaries requiring a serious hike-in, but holding fish in near-pristine condition.
- Doring River — a major tributary of the Olifants system and one of the more accessible stretches within the species' range.
- Cederberg region broadly — the mountain catchments here represent the stronghold of the species, with multiple named tributaries holding fish.
Specific Spots
- Deep, shaded pools below rapids hold the largest fish — they use the slower water to rest while staying close to the current seam where food washes in.
- Current breaks behind large boulders and submerged rock ledges are reliable holding lies, especially in the clear, low-gradient stretches of Cederberg tributaries.
- Gravel runs and shallow riffles become active feeding zones in low light — early morning and evening, fish move up from deeper pools to work the shallows.
- In impounded sections, drop-offs near inflowing streams concentrate fish, particularly when water temperatures are rising in spring.
Clanwilliam Yellowfish FAQ
Answers from onWater's species guide.
What are the best lures and bait for Clanwilliam Yellowfish?
Small spinners and in-line spoons in gold or copper tones work well in runs and pools, the flash imitates the small fish and invertebrates large yellowfish chase.
What flies work for Clanwilliam Yellowfish?
Nymphs are the backbone of Clanwilliam yellowfish fly fishing, Pheasant Tail Nymphs and Hare's Ear Nymphs (both imitating mayfly nymphs) in sizes 10–14, fished dead-drift along the bottom, account for the majority of fish.
When is the best time to fish for Clanwilliam Yellowfish?
Autumn and winter (April–August), low, clear water and cooler temperatures make fish more concentrated in pools and generally more catchable on nymphs; this is the prime sight-fishing window. Spring (September–October), fish begin moving and feeding actively as water warms, before spawning activity begins.
How do you catch Clanwilliam Yellowfish?
Most anglers wade wet, working upstream through pools and runs with a fly rod, sight-fishing to individual fish in the clear Cederberg water. The approach is similar to technical trout fishing, spot the fish, read the lie, present a nymph dead-drift along the bottom, and mend line to avoid drag.
What do Clanwilliam Yellowfish eat?
Feeds heavily on aquatic invertebrates, mayfly and caddisfly nymphs, snails, and freshwater crabs. This is the core of most successful fly presentations: nymphs fished dead-drift (drifted naturally with the current, without drag) along the bottom.
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