Can you survive if you only eat fish?

Can you get enough water just eating fish?

If you've got a man in a boxing scenario where you're just looking at numbers, the answer is no, it won't last 14 days. [1]

The difficulty with this question for me is that the body doesn't always behave as it should. The 3-3-3 rule (3 minutes without air, 3 days without water, three weeks without food) and the "100 hour rule" (4,166 days) are not absolute. [2] Some people die in hours, some in 10 days. The variables are too big.

Guinness World Records sets the record for survival without water after 18 days [3] of an 18-year-old man who was left in a cell by the police. But he was in a cool basement, licking the walls, which had a small amount of moisture. Had he been sweaty or two decades older, he probably wouldn't have lasted that long.

The need for water varies under extreme circumstances. How much clothes does your husband wear? Does he have shadows? Where is he in the ocean? How inactive can he be? Can he oil his skin with fish oil? But mostly he has one suit (j / k)? These things are all important.

Eating protein without water is not wise. Carbs are better, but your guy doesn't have them. The better thing for your husband, who can certainly live without food for 14 days, is to suck the water out of the fish and end up wringing out what he can't suck out. If he has access to the whole fish, the eyeballs and spine will also contain water. * The body has all kinds of homeostatic mechanisms for preserving fluids, including the continuous secretion of ADH (antidiuretic hormone), osmoreceptors and baroreceptors to regulate fluid volume and how much water is lost from the kidneys. [4] He will suffer terribly; Fluid will be sucked from his joints and cells, and his blood urea nitrogen will rise, and his kidneys will be damaged, he will hallucinate, he will need hospitalization, but could he live? If he's young, healthy, and hydrated, and other factors (a tarp for shade, etc) are reducing his water loss, I think the answer is yes, he could.

* In 1953, a French doctor and marine survival expert, Alain Bombard, sailed in an inflatable Zodiac dinghy with the only officially sealed food and water to keep himself from using it.He immediately began drinking small amounts of sea water, sucking water from fish, and eating raw fish when he had fresh rainwater.He sailed from Menorca to Barbados and only ate supplied food and water.His rival survivor, another doctor, Hannes Lindemann, denied Bombard's claims but also did well at sea.
[1] The Biology of Human Survival: Life and Death in Extreme Environments
[2] dehydration
[3] Andreas Mihavecz
[4] Fluid Physiology, Ch.5, 6


Human eyeballs contain more than 98% water, so I'm assuming something like this occurs in fish. Yes, this can be a source of water. The water from the "spine" would be cerebrospinal fluid (?), Which content would be similar to plasma (a lot of sodium), so not sure how effective the hydration is.