Euthynnus affinis, the mackerel tuna, little tuna, eastern little tuna, wavyback skipjack tuna, kawakawa, or tongkol komo is a species of ray-finned bony fish in the family Scombridae, or mackerel family. It belongs to the tribe Thunnini, better known as the tunas. This is an Indo-Pacific species which is found from the Red Sea to French Polynesia. Euthynnus affinis formerly was known as Euthynnus yaito.