3b/broke is not bad as it look against a fish.
As played, that's true that a fish is often not probably value betting something worst than a flush, but he can maybe bluffing or sometimes overplaying, given the pot odss i don't think we can find a fold until we have deeper read.

Did you think he can do something like with. DP, vs regular player it s a fold but vs fish I think we can just call yes