Not done much anymore and you can watch two videos on youtube. Search kau laau.
https://youtu.be/M7gaDmUTHAY
Thanks for posting!
https://youtu.be/kMx6JdXwiAo
Opelu fishing is almost lost. In south kona I see two boats and one day I saw a single lawai'a outside Lapakahi park opelu fishing. Before candy and sweets, dried Opelu and dried aku were favorites. Once in a while, a roadside store near Hookena has dry Opelu.
https://youtu.be/Art_HHGF7PM shows how it was done. Waianae, Oahu Hawaiian Style Opelu Fishing, Hokai Ua Lawai,a Makapa'a
https://youtu.be/5MCpCtNjm80 Chunky Leslie lives in Napoopoo, The Last Opelu Fisherman.
I could not get the link to highlight so I included the YouTube title.
There is rarely a day you can't buy dried Aku, and often Opelu, just north of Electric Beach on Oahu. I never did figure out what all the different names for mackerel were. I liked the cane pole trevally. Cane pole fishing is cane pole fishing, I don't care where you are.
Ron Jones