Have some information that villain is somewhat fishy. I remembered he had done some fishy plays but didnt remember what exactly anymore So this was one of first hands in game. Villain raised small and I defended crappy A. Flop was check-call for showdown value and draws I had. There is some merit in check-raising as well and using flush blocker but that is line I dont love versus someone I assume fishy as its hard to get e.g. Jx or even some weaker hands to fold even with raising flop and barreling turn and river. Also there is possibility that opponent go crazy with some KJ+, QQ+, etc. and aims to stack off flop. So dont necessarily want to lead myself into spot to play for stacks on flop with SPR of 13 or so. Turn goes checked. In river I went for 3/4 pot that could still be called with pretty wide range and it did look like villain range is often QQ or weaker. So then villain raises and as default this is just call for me. But because I thought villain is fishy there is some merit in shove also. I do block nut flush which in general is most likely one as slowplayed flush. Problem is that is villain fishy enough to stack off some 55 or some weird two pairs. Also he might occasionally have some 76. Probably just call but would someone try for thin value?