What is the main theme (Chapters 46-51) (Pg. 155-182)

The primary concern in this section is survival. From here until the end of the novel, survival will be Pi’s, and the story’s, driving force; here it is a new burden, and Pi learns for the first time how it will change him. It is not all bad—it allows Pi to be distracted from the tragic and awful loss of his whole family—but it is more all-consuming than he could have expected.