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First of all congrats on getting onto those spotties, dont they go hard at the start, great work!
To answer your questions, there are generally Spotty captures every year in Broken Bay and Pittwater, however their appearance seems governed almost entirely on the East Australian current pushing warm, tropical, nutrient water south from the QLD coast.
When we get a big lick of real blue stuff in the summer it generally brings a plethora of baitfish, which in turn can bring numbers of Spotties, Cobia (and offshore big dolphin fish and Marlin) to name just a few.
I must say, it seems that it's usually later on in summer (late summer being the time when the current usually runs the hardest against the Syd coast) when they start to show and even then it's pretty sporadic at the best of times.
A couple of years ago, they were being caught regularly as far upstream as the still waters of Cowan Creek, so they can show up anytime anywhere.
That's what I've managed to piece together myself, I'm sure others will be able to add more.
Well done again.
Cheers
Ben