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Dynamics and histological characteristics of gonadal sex differentiation in pejerrey (Odontesthes bonariensis) at feminizing and masculinizing temperatures by Lauro Satoru Ito; Michiaki Yamashita; Fumio Takashima; Carlos Augusto Strüssmann is a Environmental Science article available to read on EtoBox.

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This study evaluated the effects of different temperatures on the histological process of sex differentiation in the pejerrey Odontesthes bonariensis, a fish with marked temperature-dependent sex determination (TSD), at feminizing, neutral, and masculinizing temperatures. Fish reared at three temperatures (17 degrees C, 24 degrees C, and 29 degrees C) from hatching were sampled weekly until 11 weeks and their gonads were examined by histology. The percentages of females at 17 degrees C, 24 degrees C, and 29 degrees C were 100%, 73%, and 0%, respectively. Sex differentiation occurred earlier and at a smaller body size at higher temperatures in both sexes. The first signs of ovarian differentiation were observed at 4 and 7 weeks at 24 degrees C and 17 degrees C, respectively, and those of testicular differentiation at 4 and 7 weeks at 29 degrees C and 24 degrees C, respectively. Body or gonadal growth rates before sex differentiation were not proportional to temperature and showed no sexual dimorphism at 24 degrees C, where both sexes were present. Thus, differential growth rate is probably not a factor in TSD or histological sex differentiation in pejerrey. Blood vessels were formed

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Author

Lauro Satoru Ito; Michiaki Yamashita; Fumio Takashima; Carlos Augusto Strüssmann

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1548-8969)

Published

2005

Language

EN

Field

Environmental Science (Life Sciences)