Histological and Histometrical Study of Barbus grypus Gill

Document Type : Research Paper

Authors

1 عضو هیات علمی

2 Shahid Chamran University

3 University of Tehran

Abstract

    In this study, a total number of 10 fish freshly prepared Barbus grypus and samples from proximal, middle and distal portions of gill arches were dissected. The 5-6 µm sections were made using paraffin embedding techniques and stained by haematoxylin & eosin (H&E) and periodic acid shiff (PAS). The results showed Barbus grypus gill has consisted from 4 gill arches.  Gills are located in gill compartment on fish head lateral regions and covered by gill operculum. There are gillrakers on the cranial part and there is a holobranch on the caudal part of the each gill arch. A gill arch has consisted from primary lamellae that secondary lamellae diverge from them at one side and gill rakers at other side. Primary lamellae were covered by stratified squamous epithelium. As secondary lamellae are diverged from their axis, the primary lamellae are interrupted. There are undifferentiated cells, squamous to cuboid-shaped epithelial cells, chloride and mucous cells layer in the primary lamellae epithelium. Secondary lamellae have a vascular center containing pillar cells. Secondary lamellae epithelium is very thin and consisted of 1 or 2 cell layer which including undifferentiated and pavement cells. Gill raker has a stratified epithelium which including a lot of mucous cells. Their central part is supported by bone. Histometrical results showed that primary lamellae epithelial thickness is different from secondary lamellae epithelial thickness significantly (P≤0.05). There is a significant difference between primary lamellae in proximal portion with distal and middle portions of the right gill. The middle portions of the right primary lamellae are different with whole parts of right and left sides of the primary lamellae. There was no significant difference between secondary lamellae epithelial thickness.  In conclusion, histological structure of Barbus grypus gill is similar to other teleostei and has no difference with Cyprinidea family. 

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