on whether there is a lot or a little black on the fish—the blacker fish are considered heavy marbles. There have been many attempts to fix the marble pattern, including those by yours truly, but no one has ever been able to produce a regular pattern of the marbling. I had some marble angels that had heavy marbling at the head and tail of the fish, with the middle of the body being almost clear. I worked for a while on fixing this trait in the fish but was unsuccessful.
This marble angelfish belongs to a very hardy and popular strain of fish.
This double dark black angelfish is a sturdy fish and does not have the problems of lethal genes common in the early strains of black angelfish.
ANGELFISH STRAINS
By selective breeding, commercial fish farmers and individual hobbyists have developed all of the different strains of angelfish in the hobby today. New strains have not been developed in recent years, and we may have exhausted the genetic variations possible for angelfish. Breeders continue to improve the existing strains, especially the koi and gold angelfish.
Black
These angelfish are almost completely black, although to avoid the lethal genes of the early black angelfish, today’s blacks have a slight shading of less than pure black. These fish are often referred to in the hobby as double dark black to differentiate them from the black angels carrying lethal genes.
Black Lace
As we have discussed, the black lace was one of the first mutations to be fixed into a strain, and it consists of a dusting of dark gray all over the fish. The black lace trait occurs in varying degrees; some fish are just slightly dusted, and others appear almost black.
Blushing
This fish, also called stripeless, is basically a shiny gray color. The name blushing comes from the fact that the gill plates lack color, allowing the red of the gills to show through. Blushing angels have never been particularly popular fish in the hobby, although they are still widely available at local fish stores.
Gold
This is a solid yellow-gold fish. The gold angelfish appears in many shades, ranging from a bright yellow to a deep reddish orange. Every so often someone comes up with a new strain of special gold angel, such as the Naja Gold, but these fish have not taken hold in the hobby, although I think their genes have led to the development of the koi angelfish that are so lovely and abundantly available now.
This gold angel shows the purity of color typical of this variety, with the beginning of darker gold-orange on the head.
Gold Marble
This is just what it sounds like, a golden fish that has marbling on its body. Gold marbles, like plain marbles, are available with varying amounts of the black marbling on the fish. My experience has been that gold marbles are one of the strongest angelfish available, which makes sense, as they have many different strains of angelfish in their background and therefore possess a great deal of what is called hybrid vigor.
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