Carl: Thanks for your comments on the book and welcome to the site!
You make good points and I agree that a simplified version would be useful, something like a "Where There is No Doctor" for fish farming. The book is really aimed at fully literate NGO workers, I think.
I really enjoyed looking at your blog. Some great photos of Bangwelu fishes. Feel free to upload and tag some of those on this site and start a blog here if you like!