Changes in the number of germ cells in the gonads of the rainbow trout (Salmo gairdneri) during the first 10 post-hatching weeks
| Autor: | Chantal Cauty, Roland Billard, Bernard Jalabert, Claire Lebrun, Anne-Marie Escaffre |
|---|---|
| Přispěvatelé: | Laboratoire de physiologie des poissons, Institut National de la Recherche Agronomique (INRA), Laboratoire de Physiologie des Poissons |
| Rok vydání: | 1982 |
| Předmět: |
Embryology
Time Factors Trout Medicine (miscellaneous) GONADE [SDV.BDD]Life Sciences [q-bio]/Development Biology OVOCYTE 0303 health sciences biology 04 agricultural and veterinary sciences Meiosis medicine.anatomical_structure SALMONIDAE Female Germ cell POISSON endocrine system medicine.medical_specialty Ovary ECLOSION OVAIRE POISSON OSSEUX 03 medical and health sciences Gonocyte Prophase TRUITE Internal medicine medicine Animals 14. Life underwater Gonads Salmonidae 030304 developmental biology urogenital system Hatching CELLULE GERMINALE Body Weight [SDV.BDLR]Life Sciences [q-bio]/Reproductive Biology HISTOLOGIE biology.organism_classification REPRODUCTION Germ Cells Endocrinology Reproductive Medicine 040102 fisheries 0401 agriculture forestry and fisheries Animal Science and Zoology [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition SALMO GAIRDNERI Developmental Biology Food Science |
| Zdroj: | Reproduction Nutrition Développement Reproduction Nutrition Développement, 1982, 22 (2), pp.405-412. ⟨10.1051/rnd:19820312⟩ |
| ISSN: | 0181-1916 |
| DOI: | 10.1051/rnd:19820312 |
| Popis: | International audience; The number of germ cells in fry gonads was determined from histological sections sampled periodically over a 10-week post-hatching period. Several successive types of germ cells were identified: primordial germ cells (PGC), two kinds of gonocytes (G1 and G2) and all the stages of female meiotic prophase. The mean diameters are shown in table 1. The number of germ cells increased regularly from 47 +/- 35 (SD) after hatching (PGC) to 166 +/- 25 at 2 post-hatching weeks (G1). At 5 post-hatching weeks, two groups of fish could be distinguished by the number of their germ cells (G2) - one group had less than 926 cells and the other more than 1 577 - and by their gonadal morphology (Filiform or with an enlarged anterior part due to germ cell concentration). At 6 post-hatching weeks, the ovary differentiated with organization of the ovarian lamellae and the appearance of oocytes in meiotic prophase (4 out of 10 trout). The gonads of the other fish stayed at the indifferent stage. The number of germ cells was significantly higher in female-type gonads (6 335 +/- 3 558) than in indifferent gonads (1 696 +/- 467). The situation was the same at 8 to 10 weeks. |
| Databáze: | OpenAIRE |
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