Largemouth Yellowfish
The largemouth yellowfish is South Africa's premier freshwater gamefish — a large, native cyprinid found in the Orange-Vaal river system.
Anglers travel from across the country and abroad to fish the Orange River and Sterkfontein and Vanderkloof dams for a shot at double-digit fish. Fully catch-and-release on most guided waters, it's pursued almost exclusively on fly.
Scientific Name: Labeobarbus kimberleyensis
Also known as Geelvis, Grootbek geelvis, Vaal-Orange largemouth yellowfish
- Deep golden-yellow flanks with a thick, muscular body — the largest scale-bearing indigenous freshwater fish in southern Africa.
- Large, fleshy mouth distinguishes it from the smallmouth yellowfish; lips are rubbery and downturned, adapted for bottom feeding.
- Typical river fish run 5–8 lb; fish over 10 lb are realistic targets, and the open record stands at 22.2 kg from Vaal Dam.
- Juveniles under 30 cm feed on insects and small crustaceans; adults above that size shift heavily to fish — a key ID clue when choosing fly size.
What to know
Habitat Distribution
- Native to the Orange-Vaal river system — the only place in the world this species exists naturally.
- Found throughout the Orange River (including the Northern Cape stretch near the Kalahari) and in major impoundments: Vaal Dam, Vanderkloof Dam, and Sterkfontein Dam.
- Adults favour deep, slow channels and the pools below rapids in rivers; they also thrive in large dams where structure and depth are available.
- A potamodromous species — moves within river systems, migrating upstream to spawn over gravel in running water during mid- to late summer.
Key Locations
- Orange River (Northern Cape) — the heartland of the fishery, especially the lower river near the Kalahari where guided raft trips operate on a 70 km conservancy stretch.
- Vanderkloof Dam (Northern Cape) — a major impoundment on the Orange River known for consistent largemouth fishing and accessible from the interior.
- Sterkfontein Dam (Free State/KwaZulu-Natal border) — a technical sight-fishing destination where guided boat operations run a dedicated summer fly fishing season from January to March.
- Vaal Dam — holds the open record fish at 22.2 kg and produces large specimens for both fly and conventional anglers.
Specific Spots
- Deep, slow pools directly downstream of rapids — adults hold in the current break where fast water dumps food into calmer depths.
- Large boulders and submerged rock ledges: fish tuck tight to structure, using it as cover while watching for prey moving past.
- On dams like Sterkfontein and Vanderkloof, work the rocky shoreline drop-offs and points where fish cruise in search of baitfish.
- Shallow gravel runs become productive during the summer spawning migration — fish move up into faster, cleaner water and can be sight-fished.
Largemouth Yellowfish FAQ
Answers from onWater's species guide.
What are the best lures and bait for Largemouth Yellowfish?
Deep-diving hard-bodied lures that reach the bottom of slow pools imitate the baitfish adult largemouths feed on, retrieve slowly along the riverbed. Rubber grubs on a jig head cover both insect and baitfish feeding windows and work well in moderate current.
What flies work for Largemouth Yellowfish?
Large white or olive baitfish streamers, Clouser Minnows (which imitate small fish) are the benchmark pattern on the Orange River; fish them on a sink-tip with a slow, erratic strip through deep pools.
When is the best time to fish for Largemouth Yellowfish?
Summer (November–March) is the primary season, fish are active, feeding hard, and the spawning migration brings them into shallower, more accessible water. Sterkfontein Dam's guided fly fishing season runs January to March, coinciding with peak summer conditions and fish movement along the shoreline.
How do you catch Largemouth Yellowfish?
Most serious anglers pursue largemouths by raft or boat on the Orange River, drifting deep pools and casting large streamers to structure with a sink-tip line. On dams like Sterkfontein, guided boat fishing with elevated casting platforms allows anglers to spot and cast to cruising fish along rocky shorelines.
What do Largemouth Yellowfish eat?
Juveniles eat aquatic insects and small crustaceans, including river crabs, match this with crab or nymph patterns when targeting smaller fish in shallower runs.
See it in the app
Most maps show you water.
onWater shows you Largemouth Yellowfish.
- 01 · Species map filter
Map every Largemouth Yellowfish water
Pick Largemouth Yellowfish and the map zeroes in on the waters they call home. No more guessing which lake holds them.
- 02 · Waterbody species
Tap any water. See what lives there.
Species, behavior and seasonal patterns for every lake, river and pond, before you leave the driveway.
- 03 · Angler Intelligence
Ask how to catch Largemouth Yellowfish
Tactics, gear and timing from onWater's AI fishing guide, tuned to the species and the water you're on.
Stop guessing where Largemouth Yellowfish are.
Open the map, filter by Largemouth Yellowfish, and head to water that holds them. Download onWater and plan your next trip in minutes.
- Species map filter
- Angler Intelligence
- Fishing journal
Explore other species
Trout, bass, salmon, panfish and everything in between. Each guide unpacks the behavior, seasons, and tactics that put fish in the net.
No species information available.
Smarter Fishing Starts in the App.
onWater Fish gives you everything you need to plan smarter, fish better, and own every trip from first cast to last.