The broadtail moor goldfish or more popularly known as the black moor, should be entirely…
Black Moor Goldfish

Other variants
The highest quality black moors have a velvety appearance and no metallic scales.
The black moor is a black colored variant of a telescope goldfish that has a characteristic pair of protruding eyes. Black telescopes are commonly known as Black Moors, Blackamoors (archaic) or just Moors, a reference to the black North African Muslim inhabitants of Al-Andalus.
Black moor are believed to originate from China in the 1400s. In the 1500s they were traded in Japan, and lastly, in the 1800s, they made their way to the U.S.. It is widely accepted they were a result of selective fish breeding by Chinese who first called them Dragon Fish or Dragon Eyes. A young orange telescope losing its black pigmentation.
Most telescopes have deep bodies and long, flowing finnage, with characteristic protruding eyes, but the original is fan-tailed and has a similar body to the fantail goldfish, from which they are derived.
Young black telescopes resemble bronze fantails. Their black coloration and eye protrusion develop with age. They can grow up to a length of 4-10 inches, but may lose their velvet-like appearance with increasing age (lifespan: 6 to 25 years).
A genuine Black Moor never loses its color, and must not be confused with juvenile telescope fish with black pigmentation. These fish can range in coloring anywhere from a lighter grey to a dark black, but most young goldfish do not stay pure black forever, and many of them change from a rust-colored underbelly to orange splotches.
It was once theorized that the blackness in goldfish is only exhibited by the telescope-eyed goldfish and that the black color is only a permanent fixture with telescope eye goldfish. However, with the recent entry of black lionheads, black orandas, black ranchus, black ryukins, black pearlscales, black comets, black bubble eyes, black crosses of two or more goldfish, and black “hibunas”, this view is no longer true.
In fact, black telescopes do sometimes spawn normal-eyed offspring, which are black also. However, they are often culled as they do not conform to the telescope eye feature for the Moor variety.
Because their eyes are usually large, their vision is poor.
Black telescope goldfish are popular because they are hardy fish and because their black color sets them apart from the more abundant orange color. Goldfish are typically easy to care for. Black moors, in particular, are able to withstand a wide variety of temperatures. They do well with other fancy goldfish varieties, especially those with impaired vision such as the bubble eye or Celestial goldfish.
In 1941, Moscow aquarist P. Andrianov, bred a kind of black telescope with orange-red eyes.
The Blackamoor goldfish is featured on a commemmorative 2018 postage stamp from Mozambique.
The highest quality black moors have a velvety appearance and no metallic scales.
The black moor is a black colored variant of a telescope goldfish that has a characteristic pair of protruding eyes. Black telescopes are commonly known as Black Moors, Blackamoors (archaic) or just Moors, a reference to the black North African Muslim inhabitants of Al-Andalus.
Black moor are believed to originate from China in the 1400s. In the 1500s they were traded in Japan, and lastly, in the 1800s, they made their way to the U.S.. It is widely accepted they were a result of selective fish breeding by Chinese who first called them Dragon Fish or Dragon Eyes. A young orange telescope losing its black pigmentation.
Most telescopes have deep bodies and long, flowing finnage, with characteristic protruding eyes, but the original is fan-tailed and has a similar body to the fantail goldfish, from which they are derived.
Young black telescopes resemble bronze fantails. Their black coloration and eye protrusion develop with age. They can grow up to a length of 4-10 inches, but may lose their velvet-like appearance with increasing age (lifespan: 6 to 25 years).
A genuine Black Moor never loses its color, and must not be confused with juvenile telescope fish with black pigmentation. These fish can range in coloring anywhere from a lighter grey to a dark black, but most young goldfish do not stay pure black forever, and many of them change from a rust-colored underbelly to orange splotches.
It was once theorized that the blackness in goldfish is only exhibited by the telescope-eyed goldfish and that the black color is only a permanent fixture with telescope eye goldfish. However, with the recent entry of black lionheads, black orandas, black ranchus, black ryukins, black pearlscales, black comets, black bubble eyes, black crosses of two or more goldfish, and black “hibunas”, this view is no longer true.
In fact, black telescopes do sometimes spawn normal-eyed offspring, which are black also. However, they are often culled as they do not conform to the telescope eye feature for the Moor variety.
Because their eyes are usually large, their vision is poor.
Black telescope goldfish are popular because they are hardy fish and because their black color sets them apart from the more abundant orange color. Goldfish are typically easy to care for. Black moors, in particular, are able to withstand a wide variety of temperatures. They do well with other fancy goldfish varieties, especially those with impaired vision such as the bubble eye or Celestial goldfish.
In 1941, Moscow aquarist P. Andrianov, bred a kind of black telescope with orange-red eyes.
The Blackamoor goldfish is featured on a commemorative 2018 postage stamp from Mozambique.
From Wikipedia
Fresh Water Fish Breeds
Learn about different species of freshwater fish, including popular breeds like bettas, guppies and catfish.