This photo by Keoki and Yuko Stender shows what a Masked Angelfish looks like when a female changes into a male, at which time this fish takes on the coloration traits of both sexes during this transitional phase.
Keoki Stender's Masked Angelfish (Genicanthus personatus)
Masked Angelfish (Transition into Male)
From Stan & Debbie Hauter, About.com
Keoki Stender's Masked Angelfish (Genicanthus personatus)
Keoki Stender©2009 About.com, a part of The New York Times Company.
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