The Multicolorfin Rainbowfish (Halichoeres poecilopterus) is a small, bright fish commonly seen in schools.
"Males are green, while females are a pale red. All of the species begin life as females, but some later change sex to become male, changing color in the process. As only the larger females become males, their green coloring serves to signify that this change has taken place."
Groups of Multicolourfin Rainbowfish can be seen everywhere in the Manoa Lai Sea, but only in the springtime.
- In Endless Ocean, the male and female do not get separate encyclopedia entries; however, in Endless Ocean 2 they do.
- In spite of this, the encyclopedia entries in E.O. 2 are identical for both genders.