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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Induced reproduction in a migratory teleost species by water level drawdown

Full text
Author(s):
Chehade, Chayrra [1] ; Cassel, Monica [1] ; Borella, Maria Ines [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Cell & Dev Biol, BR-05508900 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Neotropical Ichthyology; v. 13, n. 1, p. 205-211, JAN-MAR 2015.
Web of Science Citations: 7
Abstract

Captive reproduction is one of the problems faced in aquaculture requiring the manipulation of environmental factors and/or hormonal treatment. Thus, we seek to verify experimentally which gonadal changes were present in mature individuals of Astyanax altiparanae arising from decreased water level. Collections were made every four hours, initiated four hours before and finished 28 hours after stimulation, at the Fish Farming Station of Companhia Energética de São Paulo, São Paulo, Brazil. The gonads were analyzed by light microscopy. The females had ovaries in the spawning capable phase until 12h; in 16h, in a more advanced stage of spawning capable phase; and, from 20h, in the regressing phase. Males had testes in the spawning capable phase until 8h; in 12h, in a more advanced stage of spawning capable phase; and, from 16h, the return to the spawning capable phase. The morphological description was corroborated by the proportion of cell classes. Females presented variation on the gonadosomatic index, but it was not found an emptying of the gonad for neither sex. The process of inducing reproduction with water level drawdown was considered satisfactory, since both sexes presented a reduction in the number of mature gametes at the end of the sample period. (AU)

FAPESP's process: 10/17586-0 - Molecular characterization of GnRH of the Astyanax altiparanae (Garutti and Britski, 2000), its effect in vivo, and its temporal expression during the reproductive stimulus.
Grantee:Chayrra Chehade Gomes
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 11/09567-8 - Molecular cloning of GnRH of Astyanax altiparanae and its effect in vivo
Grantee:Maria Ines Borella
Support Opportunities: Regular Research Grants