It’s been a minute since we’d come across a nice, unusual angelfish either in the form of a hybrid, an aberrant, or in the case of this new Koran angelfish, a sort of ‘blotchy’ xanthic Pomacanthus. This medium sized individual of P. semicirculatus is a large juvenile and it doesn’t just have a flat, yellow coloration across its body.
The very unique yellow Koran angelfish was shared by Shunyang Marine and not only is the body mostly yellow, but the usually bold blue and white body stripes are almost completely faded. A mild degree of black color peppers certain areas of the flank but the real crowning feature is the brilliant blue outline that is retained at the margins of the unpaired fins.
in this condition the yellow koran angelfish somewhat resembles the celebrated Clarion angelfish from the eastern edges of the Pacific Ocean. There’s some evidence to suggest that mature adult angelfish sometimes get weird color when they are in nuptial or breeding coloration. But like all cases of xanthism, aberrations or most commonly vitiligo, the causes of weird angelfish coloration like this are hard to pin down, and even harder to predict how they will change or remain with time, and age.