Steve, I am a scuba diver too and have been off and on for more than 10 years.
By "fair means", I mean that I would only ever consider fishing while I was free diving (no tanks). By unfair means I was thinking of commercial divers who will hunt with tanks and at night when the fish are sleeping - which I think is contemptable for recreation or business.
I dive now in South Korea where spearfishing is the norm amongst scuba divers and frankly watching them coming in irks me too as they will land fish they have no intention of eating.
I am not a vegitarian and to me there seems something right and proper about putting your own dinner on the table. I have been looking forward to a Thai green fish curry that I caught for the 6 months I have been planning this trip.
Having said all this, mainly I want to party in Phuket - and having seen the website for your bar I don't want to fall out with you
Dive safe,
Nic