Heard second hand of someone catching quite a few in the surf zone, especially the first calm conditions after a storm.
I have caught my only flounder by dragging cooked shrimp across the sea floor from my kayak (water was quite deep, maybe 10m+). Only tried this method once for maybe 30 minutes and had success.
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Whitebait Season starts 1 September 2026 and ends 30 October (inclusive). Chatham Islands: 1 December to the last day of February (inclusive)