Kilian Toledo-Guedes is a marine ecologist from the Canary Islands who has carried out his research in such diverse places as Norway or the Mediterranean Sea, where he has been based for most of the last decade. In these biodiversity hot-spots he has focused on studying sea urchins as ecosystem engineers, exotic species and, the last 15 years, on the environmental interactions of marine fin-fish aquaculture: escaped fish, aquaculture vs. fisheries and proxies to carrying capacity.