Today, coincidentally, I learned why they need the palm fronds. Can you guess?
Fishermen cut and gather the larger, lower fronds from palm trees which they then weave into large flat rafts. The rafts are pulled out to sea with small boats. During midday lampuki school underneath the rafts, seeking the shade. The fishermen use large mesh nets to catch the schooling lampuki. The fishing method has not changed significantly since Roman times.
Here’s a Geocities page with some photos of fishermen weaving the rafts together.
That said, I also really like Heather’s idea about pirate hats. “Arrrr! Where be the lampuki?”