Nice. Love the art. I felt like I was fishing at a mafia dumpster with all the jewelry I caught :)
I'd suggest that the directional cues when fishing flash or in some other way indicate that you're seeing a new one because if you get the same one as before, there's no real way to tell if you're still seeing the old one or that's the new one. I mean, the sound does tell you that the old one was accepted but still.
Also, there's a long pause after the last cue and being shown what you caught. Some visual cue that something is happening would make the game seem more responsive. It feels like it got hung up.