Went fishing there just recently at Selheim (30km before CT) behind my mums place (up stream from Bivuac Junction) plenty of fish. Caught one sooty amongst a whole heap of fish that look similar in shape but have a yellowy gut, small mouth and a little greyer in colour. I was told they are introduced species and to leave them on the bank. Never found out what they were, didn't look like talapia. Apparently not good tucker either. Fished with a bit of steak on hook. The sooty was pretty fat and was good on the bbq. Good luck!
Paul