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Pakistan Journal of Biological Sciences

Year: 2006 | Volume: 9 | Issue: 5 | Page No.: 935-939
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Authors

N. Gulsoy

Y.Aytekin

R.Yuce

Keywords

Research Article

Changing of Follicular Epithelium During Oogenesis in Rainbow Trout (Oncorhynchus mykiss, W.), Studied by Light and Electron Microscopy

N. Gulsoy, Y.Aytekin and R.Yuce
The follicular epithelium and theca of oocytes in Onchorynchus mykiss two years old, differentiates during the initial primary growth phase. The follicular cells are squamous and the thecal cells are consisted of two layers. When the oocytes developed, follicular cells become cuboidal. These cells show characteristics typical of protein- or glycoprotein- producing cells and exhibit dilated intercellular spaces. Formation egg envelope in O. mykiss begins in the previtellogenic oocytes as a layer of amorphous electron dense materials laid down the oolemma. During the vitellogenesis, several microvilli developed between the follicular epithelium and oolemma rapidly. The morphology of egg envelope in the trout reflects its oviparous nature.
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