Source of a new crop of oocytes inTilapia mossambica
© Biologischen Anstalt Helgoland 1972
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.