For fishing at 11, I'd recommend Quus. You can fish them up in all sorts of saltwater, including that in Port Windurst. They bite on a Sabiki rig (although less frequently than Bastore Sardines, so if you follow this advice be prepared to pull up a lot of those Sardines), so you can save some signif...
I don't want to get involved, just a stupid question... you know, curiosity is killing this cat:
Beyond the pearl, who gave him the sack? I thought those could only come from the original shellholder, is this incorrect? How does it work?