I saw this group of fish one day when water conditions weren’t very good, so I was happy to get a photo as decent as this. What caught my attention were the blue stripes, pointed front with underslung jaw, and forked tail.
It was a bit tricky to identify as most photos I found, including my fish book, John P. Hoover’s The Ultimate Guide to Hawaiian Reef Fishes, Sea Turtles, Dolphins, Whales, and Seals, show only shoals of Heller’s barracudas.
Heller’s barracudas are related to great barracudas but aren’t dangerous. They hunt by night and move inshore to rest in groups like this one by day.