What is the full name of Blue and yellow Marine Fish?

There isn't one specific marine fish that is universally known as "Blue and Yellow." There are many fish that have blue and yellow coloration. To tell you the full name of the fish you are thinking of, I need more information.

Could you please tell me:

* What does the fish look like? (Is it striped, spotted, or a solid color? Are the blue and yellow colors vibrant or more muted?)

* Where did you see the fish? (Ocean, aquarium, a picture?)

* What size is the fish? (Small, medium, or large?)

Once I have more details, I can help you identify the fish!