if you are talking about growing them in constantly wet areas, monarda and calla lily come to mind.
otherwise, i would think any fragrant that you could grow conventionally would work in a system like that. since it is a combination of aquaculture and hydroponics that is well suited for edibles and sun-loving plants, i believe lighting might be your limiting factor for fragrants. some prefer shade, some prefer sunny sites.

I was going to suggest white butterfly ginger (Hedychium coronarium) however it gets tall (4'-6').
I'm not familiar with aquaponic systems however I searched and saw that lots of regular plants can grow in this environment. If so I'd also suggest Brunfelsia gigantea.

-Robert