Hi I've never fished that river but the Bushmans river which is also part of the bergs, you should catch brown trout. Tackle wise a 3wt with floating line.
Flies :
Dry - Hoppers, RAB, Red Humpy's, Wulf Iresistable and Adams all small like size 14-18
Nymphs - ZAK, GHRE and PTN, natural colours and all small size 16-20
Tippet 5x - 7x
Hope this helps.