from my experience with red oscars i know this play into coloration:
1.food namely what carotenoids pigments are in it
2.how fast they were grown as juvies
3.water quality(this can change coloration as adults but juvies it can have a more permanent effect on)
4.stress levels
The one in the picture couldn't get much more mature than she was. She was a 3-4" breeding female. I fed her the same food as I feed all my fish. She was just yellower than most other percs.
You will often see TR percs that are more yellowish. In those cases it is usually food and age related.
Though I have been around clowns for over 20 years now (pet trade) I have noticed that younger specimens and newly aquired specimens sometimes demonstrate lighter color phases. The evidence that I have is all from specimens I own/owned. I believe that DIET and Evironment play a key factor in coloring the majority of the time. I have received numerous clowns when they have a yellowish/faded lite orange coloring. After feeding a variety of foods and clear water conditions many (majority) grew up and/or colored up to bright, vibrant colors.
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