Ma'oma'o--Hawaiian Sergeant

We saw these at Captain Cook: Five black bars, yellow tint only as juveniles, fades as they grow into a greenish-white. Black marking on anal fin.

The abdomen often develops subtle yellow striping, the bars can lengthen or shorten, and the ground color can lighten or darken. Juveniles, common in tide pools, are yellowish between the bars. 

Hawaiian Sergeants are frequently seen swarming high off the bottom to feed on plankton, usually over a specific area of the reef where they shelter and reproduce. When disturbed they dive as one for cover, but soon rise again to resume feeding. In bright sunlight they will feed almost at the surface; when clouds cover the sun they descend somewhat. In addition to plankton, these fish will consume algae or anything else they can find.