Thanks again for the tip. I keep a close eye on everyone. When someone starts to lose health points, I reassign them to an easier job--usually farming. But my folks are all healed up now, with just occasional damage from building or researching--at which point, of course, I switch them over and they heal up again.
Fishing really makes things go a lot faster--I can have a much larger population, and they're much more productive. Love the fish.