what are the two reasons the canoe is valuable to kino ?

From the text:

"Kino and Juana came slowly down to the beach and to Kino's canoe, which was the one thing of value he owned in the world. It was very old. Kino's grandfather had brought it from Nayarit, and he had given it to Kino's father, and so it had come to Kino. It was at once property and source of food, for a man with a boat can guarantee a woman that she will eat something. It is the bulwark against starvation."

Source(s): The Pearl