Dr.Mainak Banerjee | The University of Burdwan (original) (raw)
Ph.D Research Scholar , Fishery Research Unit .
Supervisors: Prof. Padmanabha Chakrabarti
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Pontificia Universidade Catolica de Minas Gerais
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Papers by Dr.Mainak Banerjee
The corpuscles of Stannius (CS) of important food fish Notopterus notopterus were studied in rela... more The corpuscles of Stannius (CS) of important food fish Notopterus notopterus were studied in relation to ovarian maturation. Cytological status of CS were correlated with the ovarian development during growth, maturation and spawning phases. The cytoarchitecture of CS in N. notopterus showed two principle types of secretory cells (Type I and Type II) arranged along the connective tissue septa. Different germ line cells were recognized on the basis of size and histoarchitectural morphology of cells. The Type-II cells varied according to the proliferation of different stages of oocytes in harmony with the various reproductive phases. It was found that at the end of growth phase and onset of maturation phase the diameter along with cytoplasmic granules of Type-I cells increased considerably than the Type-II cells, which was correlated with the occurrence of cortical alveolus and yolk granule stages in the ovary. During the end of maturation and spawning phases the diameter of Type I cells further increased along with chromophobic cytoplasm and hypertrophied nuclei were arranged in clusters encircling the blood vessels. No significant changes were noticed in the Type II cells. These momentous changes correlated with the dynamic cytological activities like vitellogenesis and occurrence of mature oocytes in the ovary. Thus the cytological changes of the CS during growth, maturation and spawning phases accomplished with the ovarian maturation in N. notopterus.
The histological status of adrenocortical tissues and the correlated seasonal changes in ovarian ... more The histological status of adrenocortical tissues and the correlated seasonal changes in ovarian activities in Mystus vittatus was performed. The tubules and nests of interrenal and chromaffin cells were located in cephalic kidney around the main branches of posterior cardinal vein. Various female germ line cells were identified in the ovary based on size, distinctive features and histoarchitechture of the cells. However, on the basis of relative abundance and size of the different oocytes, the event of oogenesis has been found to occur in four distinct phases, including growth, maturation, spawning and post-spawning. The cytoplasmic features and the architecture of the interrenal and chromaffin cells varied during different phases of the reproductive cycle. During growth and maturation phases, the amount of cytoplasmic granules of interrenal cells increased than chromaffin cells that was in coincidence with the increase of early and late perinucleolar oocytes followed by highest frequency percentage of oocyte at stages IV and V. The cytoplasmic mass of interrenal cells was gradually elevated along with hypertrophied nuclei from the end of maturation and spawning phases also correlated with the increased frequency of mature oocytes. Therefore, gradual accumulation of cytoplasmic granules in the interrenal cells was noticed during post-spawning phase. The cytological variations in the interrenal and chromaffin cells harmonized with constitution of different ovarian cells during different reproductive phase in M. vittatus.
The corpuscles of Stannius (CS) of important food fish Notopterus notopterus were studied in rela... more The corpuscles of Stannius (CS) of important food fish Notopterus notopterus were studied in relation to ovarian maturation. Cytological status of CS were correlated with the ovarian development during growth, maturation and spawning phases. The cytoarchitecture of CS in N. notopterus showed two principle types of secretory cells (Type I and Type II) arranged along the connective tissue septa. Different germ line cells were recognized on the basis of size and histoarchitectural morphology of cells. The Type-II cells varied according to the proliferation of different stages of oocytes in harmony with the various reproductive phases. It was found that at the end of growth phase and onset of maturation phase the diameter along with cytoplasmic granules of Type-I cells increased considerably than the Type-II cells, which was correlated with the occurrence of cortical alveolus and yolk granule stages in the ovary. During the end of maturation and spawning phases the diameter of Type I cells further increased along with chromophobic cytoplasm and hypertrophied nuclei were arranged in clusters encircling the blood vessels. No significant changes were noticed in the Type II cells. These momentous changes correlated with the dynamic cytological activities like vitellogenesis and occurrence of mature oocytes in the ovary. Thus the cytological changes of the CS during growth, maturation and spawning phases accomplished with the ovarian maturation in N. notopterus.
The histological status of adrenocortical tissues and the correlated seasonal changes in ovarian ... more The histological status of adrenocortical tissues and the correlated seasonal changes in ovarian activities in Mystus vittatus was performed. The tubules and nests of interrenal and chromaffin cells were located in cephalic kidney around the main branches of posterior cardinal vein. Various female germ line cells were identified in the ovary based on size, distinctive features and histoarchitechture of the cells. However, on the basis of relative abundance and size of the different oocytes, the event of oogenesis has been found to occur in four distinct phases, including growth, maturation, spawning and post-spawning. The cytoplasmic features and the architecture of the interrenal and chromaffin cells varied during different phases of the reproductive cycle. During growth and maturation phases, the amount of cytoplasmic granules of interrenal cells increased than chromaffin cells that was in coincidence with the increase of early and late perinucleolar oocytes followed by highest frequency percentage of oocyte at stages IV and V. The cytoplasmic mass of interrenal cells was gradually elevated along with hypertrophied nuclei from the end of maturation and spawning phases also correlated with the increased frequency of mature oocytes. Therefore, gradual accumulation of cytoplasmic granules in the interrenal cells was noticed during post-spawning phase. The cytological variations in the interrenal and chromaffin cells harmonized with constitution of different ovarian cells during different reproductive phase in M. vittatus.