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Saroj Kumar Ghosh and Padmanabha Chakrabarti

Abstract

The structural characterization and function of the stomach in the omnivore Pygocentrus nattereri were described using light and scanning electron microscopy. The sac-like stomach was morphologically divided into the cardiac and pyloric regions. The histological structure of the stomach consisted of four layers of the mucosa, submucosa, muscularis, and serosa. The superficial epithelium of the cardiac stomach was lined with columnar epithelial cells and the glandular epithelium contained numerous gastric glands. Gastric glands were completely absent in the pyloric portion. The mucosal surface of the stomach was a meshwork of various folds, provided with oval or rounded columnar epithelial cells which were densely packed with short, stubby microvilli. The occasional presence of conspicuous gastric pits was surrounded by epithelial cells. The localization and chemical nature of acid and neutral mucins in the various cells of the stomach was studied by employing combined the Alcian Blue-Periodic Acid Schiff (AB-PAS) technique. The deposition of glycogen was detected in the gastric glands as well as in the epithelial lining of the stomach. The utmost reactions for protein and tryptophan were recorded in the gastric glands of mucosa. The cellular organization and histochemical characterization of the stomach are discussed in relation to the feeding and digestion of the fish concerned.

Open access

Saroj Kumar Ghosh and Padmanabha Chakrabarti

Abstract

The morphoanatomy, cellular organization, and surface architecture of the olfactory apparatus in Cirrhinus reba (Hamilton) is described using light and scanning electron microscopy. The oval shaped olfactory rosette contained 32 ± 2 primary lamellae on each side of the median raphe, and was lodged on the floor of the olfactory chamber. The olfactory lamellae were basically flat and compactly arranged in the rosette. The olfactory chamber communicated to the outside aquatic environment through inlet and outlet apertures with a conspicuous nasal flap in between. The mid dorsal portion of the olfactory lamellae was characterized by a linguiform process. Sensory and non-sensory regions were distributed separately on each lamella. The sensory epithelium occupied the apical part including the linguiform process, whereas the resting part of the lamella was covered with non-sensory epithelium. The sensory epithelium comprised both ciliated and microvillous receptor cells distinguished by the architecture on their apical part. The non-sensory epithelium possessed mucous cells, labyrinth cells, and stratified epithelial cells with distinctive microridges. The functional importance of the different cells lining the olfactory mucosa was correlated with the ecological habits of the fish examined.

Open access

Saroj Kumar Ghosh and Padmanabha Chakrabarti

Abstract

Rita rita is a carnivorous, bottom dwelling catfish inhabits in muddy dirty water and depends on olfactory sensation for procurement of food. The structural organization and function ofvarious cells lining its olfactory epithelium have been investigated by light and scanning electron microscopy. The elongated olfactory organ consists of 64-68 primary lamellae arising from a narrow median raphe. Sen­sory as well as non-sensory regions are distinctly oriented on each olfactory lamella. The sensory epithe­lium occupies the apical tongue-shaped area and basal part of the olfactory lamellae, whereas the middle part is covered with non-sensory epithelium. The sensory epithelium is composed of 2 types of dendrites of receptor cells (either ciliated or microvillous), labyrinth cells, and a large number of flagellated suppor­ting cells. The non-sensory epithelium is made up of stratified epithelial cells having a different pattern of microridges and mucous cells. Variations in the cellular orientation of the various cells on the olfactory epithelium have been correlated with the functional views of the fish concerned.

Open access

Padmanabha Chakrabarti and Saroj Kumar Ghosh

Abstract

The present study focused on observations of the histological status of adrenocortical tissues and the correlated seasonal changes in testicular activities in Puntius sarana (Hamilton). Interrenal and chromaffin cells were located in the head kidney between the posterior cardinal vein and hemopoietic tissues. Various male germ cells were identified in the testis based on distinctive features, distribution, and staining properties. The cytoplasmic features and the architecture of the interrenal and chromaffin cells varied during different phases of the annual reproductive cycle. The cytoplasm mass was elevated throughout maturation and spawning phases; however, it was weak in the post-spawning and growth phases. The staining intensity changed in the cells showing various phases of secretory efficiency harmonized with the constitution of different testicular cells.