What jack is this?

Someone caught this on a sabiki, wondering what variety of jack it might be.

https://i.postimg.cc/KjkbPB36/IMG-7755.jpg

Black jack...sorry, too easy. I’ve caught a lot of fish there and have never seen any that color. Interesting.

It's just a dark color phase of a Blue runner.
Rare, but it is the same fish as the other...