A lot of people have asked me what they are.
The white looking threads on sushi or sashimi plate.
Some people even asked me if they are edible.
It's called tsuma. They are made out of daikon or Japanese radish.
In Japan, tsuma could be seaweed.
They are edible and good for you. They are used to decorate the plate, but also the radish and seaweed decrease the smell of raw fish and kill the germs!