This survival guide would've come in handy to Pi while he was at sea. Even though some of these animals were never encountered, some were. Pi could have understood how to better deal with these dangerous animals.
The Non Slip Loop Knot. Superb. The strongest loop knot you can tie. Used by big game anglers worldwide. Easy to tie, far stronger and more reliable than the old fashioned strangulating figure eight knot that can substantially weaken line. Ultimate Knots