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Dark Locus: Gold Phenotypes The allele for gold is on the dark locus and is designated with the symbol g.
The only allele at this locus that appears in gold phenotypes is:
Gold is a recessive trait that only expresses when the angelfish is homozygous for gold (g/g). Gold is recessive to the wild type and to the other non-wild alleles at this locus: dark (D), marble (M), and gold marble (Gm). As shown in the table below, gold will not express when paired with any allele at the dark locus other than gold.
A gold angelfish is generally a light golden color, with a darker yellow or orange color on the crown. Factors that Affect Expression of the Gold Phenotype Gold is constant in its expression. Environmental conditions do not change the phenotype. Gold angelfish raised under a variety of environmental conditions including different lengths of daily light will always show the gold phenotype.
Changes in the Phenotype as the Angelfish Matures Gene Interactions When gold is present heterozygously (single dose of gold) it does not modify the expression of any alleles at other loci. However when gold is present in homozygous form (g/g), it is epistatic to (suppresses the expression of) some alleles at other loci. It is reported to suppress the expression of smokey and the expression of halfblack. It may also suppress the expression of zebra, but information was not found to confirm the interaction between zebra and gold. Gold ghost (g/g S/+) is shown as a separate phenotype in the table, but the difference is subtle. Gold ghost can be distinguished in fry during the first few weeks of growth. Once angelfish fry are large enough to distinguish some features in coloration and marking, at about two weeks free swimming, until they are 6-7 weeks free swimming, a gold will have faint body stripes, whereas the gold ghost will be lacking the body stripes. After that, the stripes can no longer be seen on the gold. Gold and gold ghost genotypes have similar phenotypic expression, however gold ghosts will tend to be a little paler in coloration than non-ghosts. Addition of two doses of pearlscale to a gold results in a beautiful angelfish in which the entire body is highly reflective of light, and appears very shiny.
Table note: [1] Information was not found to confirm the interaction between gold and zebra.
Links
to more information about black phenotypes Approved by The Angelfish Society Standards Committee on February 11, 2007.
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