Are these people MORONS!?
They show hundreds of little crabs on the beach in one episode. And they can make fire, But they say there's not enough meat in a crab to feed them.
Hey, Einsteins:
Boil water...you don't even have to desalinate the seawater...and throw a few dozen crabs in there.
That soup is now filled with protein, and you can get to the crab meat bits.