thumb|Karasumi drying in Tokyo
Karasumi ( or wūyú zǐ () is a food item made by salting mullet roe pouch and drying it in sunlight. It is a softer analog of Mediterranean bottarga.
Japan
Karasumi is a high priced delicacy in Japan and it is eaten while drinking sake. A theory suggests that it got its name from its resemblance to the blocks of sumi (inkstick) imported from China (Kara) for use in Japanese calligraphy.
It is a specialty of Nagasaki and along with salt-pickled sea urchin roe and konowata one of the "three chinmi of Japan".
Taiwan
The wūyú zǐ is almost always the roe pouch of the flathead grey mullet (Mugil cephalus). Mullet fishing in Taiwan can be traced back to when the island was under Dutch colonial rule. Early historical accounts, from the ' to the General History of Taiwan