Imperator Angel
Hi there, i have been asking every fish site if they knew, or could even guess how long i takes to when you first see changes in the juvenile, to reach full coloration or the adult?
<Changes to full at 3-4 inches standard length in general... a bit longer for more Indian Ocean to Red Sea specimens>
  seems that no one knows, but i have been looking for an answer for quite some time now, so if you have any info I'd love to hear.
Thank You, Ryan Satow
<Welcome. Bob Fenner>

My Emp. male or female?
hi bob,
I have a 12 plus. in. Christmas island emperor angel. He's in a 240 gal. tank doing very well. Anyhow my question is . How can I tell if he's a female or male? Oh and another question is. How come at his large size. He doesn't have a streamer on top yet?? I've seen Emp.s half the size of mine with 3 to 4 in . streamers already? Do only males sport streamers??
<As far as I'm aware there is no reliable way to sexually differentiate Pomacanthus imperator externally... Have seen "pairs" in the wild on occasion... w/o visible (to me at least) sexual dimorphic, dichromic differences... Both sexes can bear unpaired fin "streamers" from what I know. Bob Fenner> Thanks,
Linstun Lee

Sexing emperor angels
bob,
I have a huge 13 in. Christmas island Emp. He's thriving in my 240 gal.. How come he doesn't have a streamer at the top end ?? I've seen 5 in. adult Emp.s sport streamers. Do males only have streamers?
<Same input/answer. Bob Fenner>