Fly fishing for Largemouth Yellowfish
The Largemouth Yellowfish or Barbus Kimberleyensis is the largest scale bearing fish in Southern Africa and indeed in South Africa. It has a larger mouth than other yellowfish that terminates in thin lips. It has two pairs of smallish thin barbells with dorso –lateral eye placement. One of the differences between it and the smallmouth yellowfish is that you cannot see the eyes from below and more visible from the top. In other words they are good hunters of prey upwards. Their colours vary from silver to yellow but the younger fish of 300 mm are very silver in colour. It is said that the SA record is 22,2 kilograms. The females grow larger than the males and gets older. A very sensitive and scarce species but probably the most valuable sports angling species in Africa with the Perch, Tiger and Goliath tiger – to date. Of course the mudfish, catfish are two species together with the Clanwilliam yellowfish and other yellowfish and a few other fish species have not reached their full potential with fishermen though...may be a good thing!. It is my opinion that anglers up until now have not been able to land the larger Largemouth yellowfish specimens, even on conventional tackle. We specialise in monster catfish and the most brutal takes ever while catching catfish with 50 pound line and 80 pound leaders have been largemouth yellowfish. There is just no way a fly rod of 12 weight will land a 20 kilogramer in our rivers. Well let me say the chances are slim. Everything in our powers should be done to eradicate the conventional anglers that are successful with this species and kill every fish they catch. I know angler along the Vaal River that have only been fishing for this species and will catch as much as 15 Largemouths and above 5-10 kilograms on every outing and eat and sell them. At least small effort are made to research these fish over the last few years but almost nothing have been done as far as I’m concerned. The telemetry program on the Vaal have revealed nothing as far as I m concerned to really assist with the conservation of this specie.
The main reason why we should do everything in our powers to prevent the poaching and killing  and even catching these species is that they take 5 years to grow only 300 mm and matures at 6 and 8 years respectively when the anal fin turns slight orange. Females the longest.  
Where to go for them
The Vaal Orange catchment but they are not to be found in the higher altitudes of Lesotho and the Cape as well as in dams. Recently some very large fish are being caught in our dams by carp anglers. Most of these are also not returned alive. Deep channels in rivers behind boulders right into the rapids. Especially the shoulder or backwater. They are very active after the first small fish in the season starts breeding such as the mudfish. It is then good to fish for them between the thousands of small fry that are jumping around on the surface. They prefer cleaner water and therefore anglers seem to be more successful on fly in the beginning of summer before the water starts to colour form the first rain water. The cleaner waters of the Wilge, the Vaal, Orange, Riet rivers have been good. The Wilge River have produced the largest fish and most good sized fish during September/ October. The main reason for this is that these areas are controlled by farmers and poaching is strictly controlled and forbidden for long stretches of good habitat. The Lower Orange river produced the most fish we caught in relation to smallmouth yellowfish in the same area. Largemouth yellowfish of good sizes will be caught in the beginning of next summer I predict. The good spots are closely guarded secrets however and rightly so! As far as I’m concerned there is no area as good as the Lower Orange for Large specimens due to the same reasons the catfish grow so large over there.
How to fish for them
As they are predators they eat mice, rats, reptiles such as lizards, large insects that fall into the water, such as bugs, grasshoppers, scorpions, crabs, small fish, frogs,  small birds etc. They are also quite omnivorous as all the conventional anglers records show. They take mielie pips, fish heads, fish fillets as well as etc as well.
So in essence the angler need to mimic the prey at the right habitat like with all other fish that are targeted. Slowly drifting and casting to right underneath trees where birds normally sit on overhanging branches, Casting a fly to above a boulder and allow it to drift into the eddy behind the rock. Along rocks sticking out of the water, in the back water of pools and even below rapids. No noise should be made and you basically have one cats per spot. Crab patterns work right onto the bank. The most underutilised areas .The crab can literally be dropped onto the bank and slowly pulled into the water .

What tackle to use
Anything smaller than a 7 weight is pushing it although 5/6 weights are used mostly as anglers targeting Smallmouth’s hook into them by accident. Of course it is easier to catch with a 5/6 all day than a 9 weight but a 9 is my preferred weight together with a 10 weight. They are predators that take insects when small but heavy piscivorous above 300 mm it is said. Floating to intermediate and at times sinking line for strong flowing waters . I don’t go lighter than 6 kilos with my tippet. 

Fly patterns
Mice patterns crab patterns, streamers, deceivers, zonkers, pups, peddars dragon, Dahlbergs divers, Basic bugs, frogs and large nymphs 
The fight
Well its statistics show that it almost always go 12 rounds.....and still win on a knock out. Lots of times they win the fight on a rod break off during the strike. Other times by pulling the rod out of the anglers hands during the take. Sometimes they snap the leaders or the fly and sometimes they just spit out the fly. Lots of times though they tend to “miss” the fly with the first take with a very large splash. It is not a known fact what happens during these misses. It could be that it is just so developed that it can in a fraction of a second feel that the content of the fly is not the real McCoy or the prey item. 

No IGFA line class records. The largest on fly on picture is around 10 kilograms. I shall be silent on our largest sizes and the location for the mean time.