As a veggie I used to quite often get people ask me how I'd cope on a desert island when I was growing up.
Why would I have ended up on a desert island?
I didn't even have a passport until after I stopped speaking to those people.
Besides if there are animals on the island then surely they most be eating something?
And if not then I could give fish a go for my own survival I suppose but really... Why would I be on a desert island?