The skippies we see up here mixed w tuna are white skipjack. They are easy to ID as they are the only ones w stripes on their belly.
Black skipjack are in the Cortez and below and they have 3 spots below the pec fins.
We also have 2 kinds of bonito roaming around.
Sarda orientalis and Sarda chilensis.
The most common is the orientalis. The differences are subtle. So unless youre catching both to compare you may just call them bones.