An interesting thing about carp is that they can go into anoxic hibernation and switch to an anaerobic metabolism based on converting glycogen to ethanol.
The waste ethanol is diffused out the gills
https://t.co/V3D1umHf04Carp can switch over to an anaerobic metabolism and quietly exhale booze until the situation gets better.
They basically evolved the same metabolic pathway as yeast, independently.
In theory, if you spent a few thousand years breeding carp for it, you could use them to make booze.
They'd be enormous, almost entirely glycogen deposits with a fish added as an afterthought.
The really interesting thing about anaerobic carp, is that they can go 4-5 months without oxygen by relying on liver glycogen.
You, a human, have only about 100 grams of glycogen in your liver, about 400 more grams in your skeletal muscles. Call it 500 grams total.
In humans, glycogen is also burned for energy. This is where the marathon runner's bonk comes from: you only have about 2,000 calories worth, and running a marathon burns those 2,000 calories.