The undulating ribbons on this Chinese pizza are hanakatsuo, thinly shaved slices of katsuobushi, or dried, fermented, skipjack tuna. Per Wikipedia:

When hanakatsuo is added as a topping to a hot dish, the steam has the effect of making the flakes move as if dancing; because of this, katsuobushi topping is also known as dancing fish flakes.

See also: 10 crazy Asian pizzas »