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Symphysodon (colloquially known as discus or discus fish) is a genus of cichlids native to the Amazon river basin in Brazil.Due to their distinctive shape, calm behavior, many bright colors and patterns, and dedicated parenting techniques, discus are popular as freshwater aquarium fish, and their aquaculture in several countries in Asia (notably Thailand) [1] is a major industry.
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
The discus throw (pronunciation ⓘ), also known as disc throw, is a track and field sport in which the participant athlete throws an oblate spheroid weight — called a discus — in an attempt to mark a further distance than other competitors.
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.
Roman bronze reproduction of Myron's Discobolus, 2nd century AD (Glyptothek, Munich) 3D model of a replica at National Gallery of Denmark, Denmark.. The Discobolus by Myron ("discus thrower", Greek: Δισκοβόλος, Diskobólos) is an ancient Greek sculpture completed at the start of the Classical period in around 460–450 BC that depicts an ancient Greek athlete throwing a discus.
The Czech inscription translates as: "At this spot on August 2, 1964, Ludvík Daněk set world record in discus throw marking 64.55 m." The first world record in the men's discus was recognised by the International Association of Amateur Athletics (IAAF), now known as World Athletics, in 1912, and was set by James Duncan in 1912 (47.58 m).
Scales enable development of vivid or indistinct patterns which help the organism protect itself by concealment and camouflage, mimicry and warning. Besides providing insulation , dark patterns on wings provided by dark colour scales would allow sunlight to be absorbed and thus probably have a role to play in thermoregulation.
Discus selenitoides (Pilsbry, 1890) – file disc [5] Discus shimekii (Pilsbry, 1890) – striate disc [5] Species brought into synonymy [6] Discus alternata: synonym of Anguispira alternata (superseded combination) Discus cronkhitei: synonym of Discus whitneyi (junior subjective synonym) Discus gomerensis: synonym of Canaridiscus gomerensis