Information gap.

There are many interestiong aspects in this story, but I would like to pay more attention to the food which Pi was eating to survive. So, what would we eat, if we were in this situation? It's rather difficult question, because we are not ready for this challenge, but he had to come up with it.
The survival course involves:
One of the most easy food - is turtle. You can eat their meat,because it is eaten both raw and cooked or fried. Also this meat is very nourishing, you will not be hungry for a long time. But meat is not the only thing which could be useful. You can drink turtle's blood, if there is only ocean around you and there is no fresh water.
Turtle meat is the main dish on Aboriginal traditional holidays of many Pacific islands.
However, you should be carefull, not all turtles' meat is eatable. One person died and 139 residents in one of the islands in West Sumatra were hospitalized with food poisoning after eating turtle meat.
Then, you should gather rain water using turtle shells. You need to  make bowls from them to collect rainwater.
Also, turtle eggs - very nutritious and rare product that relates to a particular delicacy. In eastern countries, however, this product is an everyday food. Turtle eggs are collected on the shores of the Atlantic and Pacific oceans. During the season, one turtle lays up to 200 eggs. They are nutritious and quite fatty. 100 g of egg contains 155 calories.
Then Pi was eating fish, which he caught using a net. Firstly, it wasn't pleasant to eat it in a raw form, but then dried in the sun fish was able to satisfy his hunger.