Howzit
Strange you didn't get a reply yet, also am a new member and I was at Doordekraal yesterday, will be phoning the municipality later today. I notice only a few weeks left to the end of the season, wonder what they will charge for that. Below I have attached the leaflet the security guard gave me, pretty much explains everything.
I asked him the spots where one could fish, he said there is the 2 spots on the East bank that are clearly marked, left hand side if looking down the dam from the dam wall and most easily accessible and a couple over the other side, near the island; unfortunately here the weeds have overgrown and hidden the spots and Municipality still has to come and cut them back.
The number you need to call for the permit is 021-970 3025