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Keywords	Symphysodon discus, amazonian fish, Cichlidae, gonadal development
Abstract	The Neotropical red discus fish, Symphysodon discus, originates from the Amazonian basin and has a discoid body. Although this species is popularly used in aquaria and is exported as an ornamental fish, it has not been intensively studied. The purpose of this work was to study the morphological and histological aspects of the ovarian development in the red discus. Forty females of S. discus of varying body sizes and different stages of gonadal development were used in this study. The ovaries were weighed and examined macroscopically in order to observe the maturation stages. Histological staining of hematoxilin-eosin was used for microscopic observations of the ovaries. Macroscopic observations showed immature, maturing, mature and partially spent stages of ovarian development. Microscopic examination of the ovaries revealed five stages and five phases of ovarian development. The ovaries of the mature females showed all the different phases of oocyte development, indicating the multiple spawning habit of this species.
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Name	Affiliation	Home page	e-mail	Total pubs
Camara MR	Post-Graduate Program in Ecology and Natural Resources, Federal University of Sao Carlos, Via Washington Luiz, Km 235, Caixa Postal 676, CEP 13565-905, Sao Carlos, SP, Brazil			2
Chellappa S	Programa de Pos-Graduacao em Ciencias Biologicas, Centro de Biociencias, Universidade Federal do Rio Grande do Norte – UFRN, Campus Universitario, Lagoa Nova, 1524, CEP 59072-970, Natal, RN, Brazil		bama@dol.ufrn.br	6
Verani JR	Post-Graduate Program in Ecology and Natural Resources, Federal University of Sao Carlos, Via Washington Luiz, Km 235, Caixa Postal 676, CEP 13565-905, Sao Carlos, SP, Brazil			3