Release #2" is his most recent updated release of this book Dr. Johnson covers topics that pertain to all types of fish that might be found in an ornamental pond. A Quick Reference Chart is printed on the back cover to help guide you through diagnoising fish problems. The reason you should get the second book is because your first edition is probably rather worn by now. Plus, WE DROPPED about 70 pages of information from the first edition and replaced it with 90+ new pages of edited, revised and updated inforamtion