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Source of a new crop of oocytes inTilapia mossambica

Origine des poussées ovocytaires chezTilapia mossambica

Extrait

L'ovaire deTilapia mossambica a été étudié dans le but de préciser l'origine des poussées ovocytaires. Après la ponte l'ovaire n'est pas vide pour autant, et il y subsiste des ovocytes à tous les stades du développement. Les replis de l'épithélium germinatif et les tractus épithéliaux ramifiés contiennent des flots de cellules qui produisent des ovogonies primaires, lesquelles se transforment en ovocytes et en cellules folliculaires. Il ne semble pas qu'une nouvelle poussée ovocytaire puisse se faire à partir des résidus des follicules des ovocytes atrétiques. Seuls les ovules mûrs non évacués par la ponte subissent une atrésie et se résorbent; les ovocytes immatures ou en voie de croissance ne dégénèrent pas. L'asynchronisme deT. mossambica se traduit par la présence simultanée, dans l'ovaire, d'ovocytes à tous les stades de croissance et de maturation.

Summary

1. In the teleostTilapia mossambica (Peters), new crops of oocytes arise from nests of cells of the germinal epithelium as well as from the epithelial strands ramifying into the ovocoel.

2. There is no evidence to indicate that degenerating follicle cells form a source for a new crop of oocytes.

3. After one spawning is over, the follicular layer of the mature unspawned ova alone undergo atresia.

4. Neither immature oocytes nor oocytes in the growth stages undergo degeneration.

5. The occurrence of immature, maturing, and fully ripe ova in the ovary at a particular time account for asynchronism inTilapia mossambica.

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Aravindan, C.M., Padmanabhan, K.G. Source of a new crop of oocytes inTilapia mossambica . Helgolander Wiss. Meeresunters 23, 184–192 (1972). https://doi.org/10.1007/BF01609688

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