Another unlikely luxury are fish eyes, which are a useful source of liquid and of another vital nutrient. Maurice and Maralyn Bailey, a British couple who survived 117 days on a rubber life raft in the Pacific ocean in 1973, did not initially understand why they sought them, Tipton said: "They found they started to crave fish eyes, which is not something one would normally do. It wasn't until after the voyage they realised these are quite rich in vitamin C, which is something you get depleted in when you're adrift, and can of course cause scurvy."
https://www.theguardian.com/world/2014/feb/04/castaway-jose-salvador-alvarenga-survival-expert
The outer layer of the eyeball is soft and gooey. Chefs sometimes compare fish eyeballs to eating raw oysters. When biting into the eyeball, you'll experience a crunchy, wafer-like texture in the center of the eye [8]. As you continue to bite in, the eye releases an explosion of rich, umami flavor.
https://chefepic.com/fish-eyeball/#:~:text=The outer layer of the,explosion of rich, umami flavor.
