One Gill Fish?  Or One Fish Gill?  Like Breathing With One Lung 10/7/05
In my many years of 'fishing' I have never seen this happen & could not find it on your (awesome) web site.
<There are a few accounts of this there, of Pomacanthids>
I noticed last night my Emperor Angel is only using one of his gills ! The left side appears to be closed (stuck?)
<No... is "on purpose", sympathetic nervous control>
He seems to be swimming and eating normally, at least for the time being. I don't know what could have caused this and is there anything I can do?? Don't want to stress the fish .
Any advice is greatly appreciated .
Thanks, Carol
<"Don't panic" as Doug Adams might write... Will be fine. Bob Fenner> 

Two more questions. Orange Shoulder Tang beh., Chrysurus A, beh., HLLE?  11/25/2007
Thanks again Bob.
<Welcome Steven>
Two more questions and then I won't bother you (at least for a while).
I have two fish that I wanted your opinion on their coloration. First I have a Orange Shoulder tang that I bought about 1 1/2 years ago that was / is a juvenile about 3.5" long.
<Neat animals>
He has grown maybe to 4" but is still yellow. He has the outline where the orange oval will appear but that is about it...no signs of wanting to change and doesn't grow very fast. How long would you guess until he begins his adult color change?
<A bit longer... perhaps a half to a full year. This fish is right about where such changes occur size-wise. Am in the process of sorting some of the genus Acanthurus tangs FAQs, including this one... and am out in HI currently... where most of this species are collected for the trade>
Second question is I have a Chrysurus (sp?) angel and have had him for about 1 year. He is approximately 5" long and has recently started to turn color around his mask (head area). At first I thought it was some sort of fungus, but have seen a few photos on the web and have seen the exact same marking, but these photos also only show the head area to have this coloration. Will he change completely or will this be the extent of it?
<Only time can tell here>
It kind of doesn't look as pretty as he did before this change, but if the entire body turned this kind of yellow/tan color it would look nice.
<There often is a bit of lightness, a sort of mask with this change... I do want you to consider the possibility that this might be HLLE... Please read here: http://wetwebmedia.com/hllefaqs3.htm
and the linked FAQs files above. Bob Fenner>
Your input is greatly appreciated.
Thanks,
Steven