Need tips for spearfishing in Croatia

Hi.
Ive never spearfished Croatia but I did spend 7 days on a boat from Split and did a fair amount of freediving.
Water temp was ok when I was there (July) but a 6mm suit may be better for October as temp can drop to 7 degrees in winter, so by Oct it will be cooling.
Very clean water (20m vis) but almost zero fish life when I was there. To be fair though I was not spearfishing so I may have just been diving the wrong spots.

It's October 21st now, so you may be already winding your trip down. Well, just in case - I just moved to Stavanger and I was looking for tips on spearfishing around here I have lived on one island in Croatia, just across the Split city, and basically spearfished around Adriatic since I can remember.
It is not that cold in October - you won't need 6-7 mm wetsuit. You will need 5 mm (two piece) wetsuit. I have used 3.5 mm (and some of my friends too) but those are special occasions and only for short time in the water. You will need at least 90 cm barrel speargun. It is very versatile because you can shoot fish in the holes and still manage to catch something on "waiting". Ideally you would have to have one short speargun for holes (up to 75 cm) with thick spear and strong single rubber band (19-20 mm dia.) and one 100-115 cm speargun with double rubber bands (16-18 mm dia). All tahitian tips.
For water clarity, in October water could get murky. Since the water is stil fairly warm(ish) the plankton may still be around. However, chances are that even "murky" in Adriatic sea (not counting north and Italian coast) means - 5 -10 meters of visibility.
Problem is - in order to catch anything decent in October, you will have to dive deep and long and use "waiting" technique. If this is not an option - another possibility that works is "sneaking" in shallow and semi-shallow water, moving around the rocks etc. However, don't expect much fish. Though - you may get lucky
Another thing is - in port, ask for visitor spearfishing permit. I would highly advise to do this because the police can get frisky and start confiscating stuff. It should be easy to obtain this permit at "Lucka Kapetanija" or Port Authorities in any place.
Technically, there are areas where spearfishing is allowed and where is forbidden. However, just avoid ports and beaches. At this time of the year, there are no tourists around anyway.
Good spots for spearfishing in your case would be - tip and pelagic side of island Solta, Pakleni Otoci by island Hvar (group of islands just of the coast of island Hvar), and generally Italy-facing sides of all islands. I'm not sure what your route is.

I hope this helps and you will share some tips about spearfishing around Stavanger