Did you catch any flounder with that big bar jig? They seem to have too small of a mouth to actually bite the hook? We always caught flounder on 1-2 oz leadhead jigs depending on water conditions. What if you accidentally hooked a salmon? You'd have to let it go. I do think it is legal to use barbless trebles for flounder and even lings, which is surprising. The regs only refer to single hook for salmon.
Barbless hooks are required for all species in
Marine Areas 5-13, except forage fish jig gear.
When fishing for SALMON in Marine Areas 1-13,
single-point barbless hooks must be used.
-from page 102