Kashima, huh? He doesn't know them personally but he knows the family. So this is the youngest one. There's potential, if he doesn't get himself killed. And he might even manage that.

"It's good to meet you, Naoki-kun."

He swims another circle and then comes to a stop, grinning. "So you were diving. Let's see your skills, Naoki-kun."

This will be interesting! If nothing else, Kisame will get a closer look at that glow under water. It's easy on the eyes, if nothing else, and Kisame thinks it will show some of the nighttime activities of the sea without scaring them away. His eyes aren't that good, and he's always interested in seeing more.