Gonadal development and sex differentiation of Tilapia nilotica Linnaeus [Philippines]
1981
Casaway, A.A. | Carino, V.S.
The histological events in normal gonadal development of Tilapia nilotica Linnaeus observed in this study involve the presence of primordial germ cells (PCG's) in the dorsal root of the developing mesentery, in the mesoderm ventral to the gut and in the gut endoderm right after hatching. PCG's shifted bilaterally from the dorsal root of the developing mesentery to localize in the presumptive gonadal regions in fry 1 to 3 days post hatching. Paired gonadal anlage appeared in fry at 9 to 10 days post hatching. Ovarian and testicular differentiation indicated by a flat cavity lying along the lateral side of the gonad and slit-like lumen which appear as splits in the stroma tissue packing the centro-lateral region facing the mesoganium, respectively, were both observed in fry at 30 to 33 days post hatching. Oogenesis and spermatogenesis occurred in fry of age 56 days and 3 months post hatching, respectively
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