Hi Reese
If you are looking to prawn JB / Crookhaven way while walking there are two main options . You can go to lake Wollumboola near Culburra (Crookhaven) or go to the sand flats on the eastern side of St Georges Basin ( Jervis Bay area) along the road to Christians Minde.
If prawning from a boat then you need to go to St Georges Basin and anchor inside the entrance where the Sussex River meets the basin on a run out tide. Bright underwater lights facing up currentl and scoop nets and your away. As to the best time ??. Well some say the days leading up to a dark moon some say differently , I will leave that bit of research up to you
if you are planning to come down in the next few weeks I wouldnt bother as we have had around half a metre of rain in two days. The Basin is brown, the Shoalhaven is in flood and I reckon the murk goes half way to New Zealand??????
Took a quick pic of the river last night. if you are familiar with the boat ramp at Greys Beach in Nowra, well last night it was about fifteen feet under water. The building to the right is the old sailing club building on the south eastern side of the bridge - Didn't see any prawns though???