Histological observations of gonadal sex differentiation in the F2 hybrid sturgeon, the bester.

• OMOTO NAOTAKA

  Department of Research and Development, The Hokkaido Electric Power Co., Inc Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University

• MAEBAYASHI MAMORU

  Department of Research and Development, The Hokkaido Electric Power Co., Inc

• MITSUHASHI ERI

  Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University

• YOSHITOMI KOJI

  Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University

• ADACHI SHINJI

  Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University

• YAMAUCHI KOHEI

  Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University

Abstract

The process of gonadal sex differentiation in the F₂ hybrid sturgeon, the bester (Huso huso female × Acipenser ruthenus male), was investigated histologically. In fish more than 6 months old, two types of gonads were distinguishable. In the putative ovary, the germinal epithelium had invaginations in the stroma of the gonad, and a few germ cells were localized immediately below the epithelium. In putative testis, invaginations were lacking and germ cells were observed deep in the stroma. However, active mitotic and meiotic germ cells were not observable even by 16 months of age in ovaries, and only some of the testes showed initiation of spermatogenesis by 21 months of age. The invaginations in the stroma of putative ovaries developed into ovarian lamella-like structures, whereas the gonadal surface of putative testes remained smooth. These results suggest that the formation of invaginations in the stroma of gonads is the morphological index of ovarian differentiation and that it is necessary to start hormone treatment for functional sex reversal before 6 months of age in these fish.

Journal

• Fisheries science

  Fisheries science 67 (6), 1104-1110, 2001

  The Japanese Society of Fisheries Science

Keywords

• bester
• F₂ sturgeon hybrid
• sex control
• sex differentiation

Details

• CRID: 1390001204427866624
• NII Article ID: 10008271554
• NII Book ID: AA10993718
• DOI: 10.1046/j.1444-2906.2001.00367.x
• ISSN: 14442906
• ISSN: 09199268
• NDL BIB ID: 6015509
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6015509
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed