Through photosynthesis, phytoplankton like algae store protein and sugar in the body.
Zooplankton like water fleas eat phytoplankton.
Young or baby fish eat zooplankton.
Large fish eat small fish and they are rich in protein.
Vitamin B12 is not synthesized in a fish body.
It is said that some algae and bacteria play an important role in providing Vitamin B12 to sea animals.
Miso Soup with Nori (Edible Algae)
Some say that seaweed contains Vitamin B12.
Nori is rich in Vitamin B12 among them.
I like miso soup with Nori very much.
The amount of Nori to be eaten during one meal is not much.
Caution needed but,,,
I am glad I have freedom to choose what I eat today too.