There are several allegories in this fine novel. One is the way that the flesh-eating island is willing to consume Pi and everyone/everything else. This is a thinly disguised allegory for the bloody violence of nature. Pi is both literally lost at sea and metaphorically lost at sea; every literal adventure and challenge is also a spiritual one. Finally, the encounter near the end, when Pi is blind, represents how fully he's lost his sight (reason, insight), and how little it serves him in these crazy lands.
k there is alot of allegory ... animals (each one rep something) but this guy doesnt know what he is talking about the island. The island represents Pi's own desolation. The presence of death is upon him and he begins to believe that all is lost and that there is no hope for survival. As said by Pi “There is one…the open seas.” Pg 301 there is the understanding that the island is not an island in the sense of the term for it is more of free-floating mass of algae. This represents faith strongly. For faith is not a rooted material it is based on belief, an ideal sense within a person. Pi even states “Truly I do…I promise” pg 262 showing that depression could be the end of him. In addition, the island represents death. As Pi loses faith he allows his “broken spirit to kill his body” pg 313. Thus, the island represents the loss of belief and it is when Pi decides to leave the island that he regains his belief in God and his survival. This is parallel to the loss and regaining of the identity of the hero during their quest. Therefore, this algae island represents Pi’s struggle to have belief during his epic trial. straight from my stuff