Apart from big orange crabs I have never seen any while diving around Kaikouria. I suggest you capture a few at the pier before leaving. I have never tried this, but if you keep them in a cold wet towel they should survive for a couple of days.
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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)