According to their cellular characteristics, five types of cells were distinguished: oogonia
, oocyte I, oocyte II, oocyte III and oocyte IV.
Within the same individual, alongside mature male gametes, female oogonia
also develop (Coe 1931b).
Because of the plasticity of their gonad development, striped mullet retain some characteristics of the opposite sex (such as singular oogonia
in males or duct-work in females) during the initial stages of differentiation.
Stage 1 oocytes appeared more oval shaped than the oogonia
but were still closely adhered to the trabeculae, and ranged from 20-25 [micro]m in size (Fig.
We saw no primary oogonia
in our histological sections of mature ovaries, another indication that new oocytes are not produced in mature ovaries.
vulgaris reynaudii 4 types of oocytes: (1) oogonia
, (2) oocytes with follicle cells that change from squamous to cuboidal, (3) oocytes surrounded by follicular cells, (4) follicular oocyte folds displaced to the periphery by the formation of the yolk, and (5) mature oocytes without follicle cells.
Spermatogonia or oogonia
cannot be identified during this phase and, consequently, the sexes cannot be differentiated.
50) Gonad stage Microscopic criteria 1 Immature Oogonia
and primary growth oocytes present; high proportion of connective tissue, no atresia or MAs, ovarian membrane thinner than in resting stage.
cells are growing from the trabeculae and form clusters on trabecular walls.
and chromatin Testes strandlike and nucleolar oocytes and, gray-white.
are observed embedded in the follicle walls (Fig.
Active Follicles are filled with Follicles start to grow development oogonia
and developing and enlarge, and oocytes anchored to the connective tissue follicle wall, and reduces.