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Symphysodon discus, the red discus or Heckel discus, is a species of cichlid endemic to the Amazon Basin of Brazil, where found in the lower Rio Negro, upper Uatumã, Nhamundá, Trombetas and Abacaxis. [2] This species is essentially restricted to blackwater habitats with a high temperature of 26–32 °C (79–90 °F) and low pH of 4.2–5.2. [3]
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.
The taxonomy is disputed, but FishBase follows a review of the genus from 2006. [2] [8]In 2007 it was suggested that the correct scientific name of the blue/brown discus is S. haraldi, whereas S. aequifasciatus is the correct name for the green discus.
Symphysodon tarzoo, the green discus, is a species of cichlid endemic to Brazil; specifically, to rivers of the western Amazon Basin upriver from the Purus arch, although it occasionally occurs downstream. [2] [3] An introduced population in the Nanay River is based on stock from the Tefé region. [4]
Discoteuthis discus, the rounded disc-fin squid is a species of squid in the family Cycloteuthidae. They occur in the tropical and subtropical Atlantic Ocean and the central North Pacific . While mature specimens have not been found, the unnamed species Discoteuthis sp.
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(Pilsbry, 1890) – striate disc [5] Species brought into synonymy [6] Discus alternata: synonym of Anguispira alternata (superseded combination) Discus cronkhitei: synonym of Discus whitneyi (junior subjective synonym) Discus gomerensis: synonym of Canaridiscus gomerensis
Displaying male. Redhump eartheaters are immediate maternal mouthbrooders.These fish grow relatively quickly, and can be sexed as subadults. Sexual dimorphism is clear - males have a large, red nuptial hump on their heads and grow larger than the females.
The marine dinoflagellate genus Gambierdiscus occurs globally in tropic and subtropic regions. It mainly grows attached to macroalgae and coralline turfalgae. Thus, it does not form visible surface blooms like many other harmful dinoflagellate species (red tides).