"Diving In Canaries" is an excellent, comprehensive, fully illustrated guide to the marine life in the Canary Islands, written by Sergio Hanquet (www.sergiohanquet.com). Being a regular visiting diver to Lanzarote, I find it invaluable in identifying all the underwater creatures I see during my dives there. It's got a very useful list at the back of the book of the popular dive sites in the various Canary islands plus space to add your own notes. James.