Interesting stuff. Good luck, David. There was a discussion thread that popped up not so long ago in the polypterus sub-forum regarding alternative, non-destructive methods of aging Polypterus. I followed the thread with much interest, as I will follow this one. Perhaps your research will pave the way for a similar study of polypterus, or else spark further inquiry.
From the sound of it, you are leading a captivating life. I am always inspired when I see people who have tunneled out such wondrous niches! I occasionally consider changing my major to marine biology, but my place will be in an English classroom, or at a desk writing fiction. Best wishes, and I apologize if I have derailed your topic.
Ernest III.