I have been teaching a water quality field and lab-based methods course for about 10 years, and tried a number of books. While there are many purely aquatic ecology books out there, few also deal well with the applied aspects of aquatic ecosystems that students in natural resources management or environmental science programs are interested in or will deal with when they get jobs in their field. To improve the book further, I would suggest extra material on methods that could be used in lab-based courses.