Recently, I made a visit to an long time friend who has several small fish ponds in his back yard (keep in mind that his back yard is about the size of a mini-bus). He raises the fish, then sells them to the market as a means of extra income. It also means some good eating for his family (and the friends that he has over . . . mmmm, good). It's easy catching, too. Drop the line in, pull 'em out.
