I'm unsure about Botany Bay - but have been doing OK in the Harbour (for bait, not food) - of late there's been plenty around, if a little "hit'n'miss" - such is fishing I suupose. Try around Drummoyne (near the swimming pools), the flats at Iron Cove, and around Five Dock.
Once the sun sets - put the waders on & do you best!
All the best to you.