I am looking foward to reading your book. Is your series on saltwater smarts done with? They were great articles. I am pretty sure the reproduction article insired me to get the skate eggs.No, they aren't. I go into enrichment and the Shark brain in my eBook that will be coming out later this year. Sharks are very intelligent (for fish). I go over training basics, what behaviors to train for, and how these behaviors affect your overall care for the Shark or Ray.