[Spaceships] Biological Ships: Food Consumption

[scc]

OK, Spaceships says that a ton of food provides 500 man-days, that is it will feed a man for 500 days, or 500 for one. But neither that, nor 7 says hows much food an organic ship will consume to stay alive.

I'm guessing that such a figure would be in how long a Cargo Bay packed full of food would last it.

Note that I'm talking about how much food the basic organism needs to survive, I'm assuming that any high-powered systems have somewhat separate power arrangement's using standard power systems, but electricity from a nuclear reactor won't keep a space bug alive