Points to ponder

"The Clarence estuary is host to the only river port for commercial coastal shipping on the north coast of NSW."
[NSW Dept. of Natural Resources]
"The fishing fleet based in the estuary is the largest in NSW - fish and prawn production is also the largest at over 800t/yr and 280t/yr respectively, or 18% and 35% respectively of the total NSW estuarine catch."
[ibid]