Why did Caravaggio paint the basket of fruit?

Possibly Caravaggio simply painted what was available; or possibly it has some meaning along the general lines of 'all things decay'; "This is what the Lord God showed him - a basket of summer fruit. He said, "Amos, what do you see?" And he said, "A basket of summer fruit." Then the Lord God said to him, "The end has come upon my people Israel; I will never again pass them by."