PA Histomorphological and Histometric study of the co-relation between the development of the Zona Radiata and the Zona Granulosa during oogenesis in the Gangetic mystus - Mystus cavasius (Hamilton, 1822)

Nilanjana Chatterjee


The growth and development of the zona granulosa (ZG) and the zona radiata (ZR) layers from the different oocytic stages of the Gangetic catfish, Mystus cavasius (Hamilton, 1822) has been studied. The ZR layer appeared earlier during the late perinucleolus stage whereas the ZG layer was detected for the first time in the yolk vesicle stage. The two layers were found to increase in thickness with the growing oocyte cell diameter and a strong positive correlation was predicted by Pearson correlation coefficients for both the layers. The maximum height of the ZR (6.8 ± 0.64 μm) and ZG (10.8 ± 0.27 μm) was recorded from the mature oocytes which exhibited maximum yolk incorporation with eccentric nuclei. The ZG provided with prominent syncytial nuclei have shown more significant growth than the ZR throughout the study indicating its active role in the synthetic process while the ZR was known for its permeable and porous nature. Some inter cellular as well as intra cellular connections were also detected in between the Zona layers proving that the ZR and ZG layers play some vital role in the oocyte development process and hence in regulating the reproductive cycle of the female fish under study.


Keywords: Histology, Histometry, Zona granulosa, Zona radiata, Oocyte, Mystus cavasius

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