I have question regarding the sub-population of the Regal angels.
From what I read, the Red Sea Regal angel should have the most orange, especially the the lines of the anal fin, then the Pacific Regal. The Indian Ocean is more yellow, less orange, especially of the anal fin.
Is this true or am I mistaken?
The question is my Yellow Chest Regal was suppose to be a Red Sea Regal. However, he seem more yellow over all rather than orange. The Glue chest Regal that I have is smaller than the Yellow chest by about 1/2 inch. My Blue Chest Regal is certainly more orange over all than my Yellow Chest, that is bigger. Below are two pictures of the two Angles. In real live, the coloration is a little more different, but I cannot capture it really well in photos.
Same camera, same lighting, no adjustment other than cropped and resized.
What do you guys think? Is my Yellow chest a Indian Ocean or Red Sea?
ThRoewer
Since you are experiences on several color forms of Regal, I would really love your observations on the color differences of these forms.
My observation from having one blue chest and one yellow chest Regal that is about the same size (yellow is .5 inch larger at 3.5)
Pacific Regal: Narrower yellow bands. Yellow color is more orange shaded. This is particularly prominent on the anal fin. Confirm what other (ThRoewer) have stated that the blue chest seem to be shyer and more reclusive. There is more blue in the white band of this fish. Over all, looks darker than my yellow chest.
Red Sea (at least yellow chest. Alton, who I got this fish from, stated that the seller informed him that this fish was from the Red Sea) is a much less shy. This was a fish that was abused by a smaller Regal in Alton's tank. While not the boss of the tank, he is certainly not taken any flaps from any of my much larger tangs.
Several variables that may or may not affect the observation:
Yellow breast is bigger by a little.
Blue chest have been under my care for 2+ years while the yellow chest just 3 months.
my blue chest have been in captivity since tiny, less than 2 inches. I am not sure about my yellow chest.
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Can you comment on the thickness of the yellow bands on the body? I find that the Red Sea Yellow bands are wider than the Blue chest yellow bands.
The yellow-orange is the base/background body color. The bands are the white stripes with the black-blue borders. Regal angel have usually 11 of these bands on either body side: one small before the eye, one behind the eye, one over the edge of the operculum that branches off to cross the belly area and end at the start of the anal fin, 6 wider ones on the body, and finally two on the tail. The last may just be a thin line along the tailfin root.
The body and tail bands loop in the anal fin. Especially on Pacific regals they seem to form clear and even loops, while Red Sea and Indian Ocean specimen often have a more chaotic pattern.
Pacific blue gray chest regals are more variable in coloration than Red Sea and Indian Ocean yellow chest regals. Pacific specimen can have a background coloration that ranges from bright yellow over orange yellow to an ochre tone. In general their bands are wider which gives them a more overall blue appearance. Their color scheme seems to be much more camouflage that that of the YBR.
Very variable is also the tailfin color of Pacific specimen. It can range from a yellowish green over pale green to almost a pale white or even clear.
The tailfin color of Indian Ocean specimen is always a shade of orange yellow or yellow, sometimes with a hint of green on the edge, while Red Sea specimen always have a fairly solid orange-yellow tailfin. Generally, with Red Sea and Indian Ocean specimen, the orange-yellow of the tailfin is a tad lighter and more towards yellow than the body background.
Usually the tailfin coloration of YBR becomes more solid with age.
Your Pacific regal seems more orange-yellow, though more often they are quite pale yellow. Nutrition may play a role as well as the colors of the tank and region of origin. Yours seems to be also still quite small.
I had this one in a tank with lots of hairy green and red algae, but she had that coloration already when I got her:
This fish was about 4.5 inch long.
The lightning and camera of course also have an influence on the appearance in pictures.
Age also plays a role as especially the Red Sea and Indian Ocean specimen stretch with age which makes the background color more prominent and the whole fish appear more orange-yellow.
I would say that your YBR is from the Red Sea. The white bands are narrow and the background color is very evenly orange-yellow which gives the fish a more overall orange-yellow appearance.
In my experience Maldives regals are a little lighter in their yellow in the chest area and their bands are slightly wider.
Also, if this fish was bought on the east coast it likely came from the red sea, or East Africa as Red Sea imports usually come into the US over the Atlantic route (shorter).
Maldives come either way - the flight time to LA going east is just an hour longer than to New York via the westward Atlantic route.
Red Sea fish seem to have the more intense and cleaner coloration than Indian Ocean or Pacific regals. The reason may partially lie in the mineral richness of the Red Sea due to being surrounded by deserts. It is also a particularly nutrient poor sea as it has no significant freshwater influx from rivers, which are the primary source of organic nutrients.
Another factor is for sure genetics.
Interestingly all Pygoplites juveniles are yellow regardless if from the Pacific or Indian Ocean. Given what we know so far about the evolutionary history of Pygoplites and their closest relative of the Genus Holacanthus, I would say that the color change from an all yellow background to a grey blue chest fits more the common color change pattern of large angel fish and especially Holacanthus.
The YBR seem to have dropped this color change during their isolation in the Red Sea and keep their juvenile coloration throughout their life. The only remaining coloration change is the replacing of the eyespot on the soft rayed dorsal fin.