I've spent a fair bit of time over the past few weeks bumping into SKF in Google searches ... and largely ignoring it. I had forgotten/didn't realise it was Australian, as there's nothing to indicate that.
So that's the first point - localisation is important. I could have been here ages ago.
A much more critical difference between SKF and other forums is that SKF does not display content to non-logged-in visitors who find it in Google. So many times I was lead to a topic by Google, only to find myself blocked from viewing it when I clicked on the link. So I learned to ignore SKF entries in Google. It was just annoying.
This is the most critical issue to resolve. Rebranding won't help if this is not tackled, and may make things worse. SKF is already a good name/brand, as it says what it is. There are plenty of established generic fish forums with a critical mass that will be very hard to compete with.
However, if you really want to go this direction, then one of the first three names above will be best. The first two are actually great; the third is more niche-descriptive.
I just think that fixing the issue of viewability of content by new visitors is far more important, performance-wise.