What are some fragrant plants at would work well wih an aquaponic system?
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.