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Gonadal development and sex differentiation in the cichlid fish Cichlasoma dimerus (Teleostei, perciformes): A light- and electron-microscopic study by Fernando J. Meijide; Fabiana L. Lo Nostro; Graciela A. Guerrero is a Environmental Science article available to read on EtoBox.

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Although the overall pattern and timing of gonadal sex differentiation have been established in a considerable number of teleosts, the ultrastructure of early stages of gonadal development is not well documented. In this study, gonads from larval and juvenile stages of laboratory-reared Cichlasoma dimerus were examined at the light-microscopic and ultrastructural levels. This freshwater species adapts easily to captivity and spawns with high frequency during 8 months of the year, providing an appropriate model for developmental studies. Larvae and juveniles were kept at a water temperature of 26.5 +/- 1 degrees C and a 12:12 hour photoperiod. Gonadal development was documented from 14-100 days postfertilization, covering the period of histologically discernible sex differentiation. Gonadal tissue was processed according to standard techniques for light and electron microscopy. C. dimerus, a perciform teleost, is classified as a differentiated gonochorist, in which an indifferent gonad develops directly into a testis or ovary. On day 14, the gonadal primordium consists of a few germ cells surrounded by enveloping somatic cells. Ovarian differentiation precedes testicular differentia

Who reads Gonadal development and sex differentiation in the cichlid fish Cichlasoma dimerus (Teleostei, perciformes): A light- and electron-microscopic study?

Author

Fernando J. Meijide; Fabiana L. Lo Nostro; Graciela A. Guerrero

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

2005

Language

EN

Field

Environmental Science (Physical Sciences)