The details or events in which the author included to develop this theme was the use of fish by Pi and Richard Parker for different purposes which are mentioned in the chapter given in the question.
What is a Theme?
A theme is defined as a message or abstract idea which is derived from the way a literary work treats its subject matter and varies according to their various roles etc.
In Chapter 61 from The Life of Pi, by Canadian author Yann Martel, it talked about the various in which Pi and Parker gathered fish for various uses in which the latter was unable to kill it as a result of him being a pacifist and vegetarian which therefore makes it the most appropriate choice in this scenario.
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