Problem with kahawai is the flesh is so oily hence it oxidises and goes fishy when frozen. Im no expert but hot smoked has worked well for me- cooks the oils in , not sure cold smoked would do the same?
If you are rich or know a beekeeper, try using manuka honey and salt instead of the brown sugar, awesome flavour. We eat then it cold over the next few days, dont freeze it at all.
Unloved kahawai and leftover (raw) frames are primo cray bait.
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