Season-Induced Changes in the Liver Cells and Ovarian Tissues During Growth, Maturation, Spawning and Post-spawning Phases in Spiny Eel Mastacembelus armatus (Lacepède, 1800)

Abstract

Cytological status of hepatocytes in respect to seasons influencing ovarian activities has been studied in Mastacembelus armatus (Hamilton). Histologically, the hepatocyte of female liver was provided with distinct nucleus and basophilic cytoplasmic granules. In M. armatus different germ line cells were recognized on the basis of size and histoarchitecture of the cells. By examining seasonal changes in relation to hepatocytes and ovary, it was found that during growth and maturation phases the density of cytoplasmic granules of hepatocytes was increased in number as well as the nucleus become hypertrophied. These features were well correlated with the occurrence of cortical alveolus and yolk granule stage in the ovary. During spawning phase the cytoplasmic granules were sparse in the hypertrophied hepatic cells. This was due to the dynamic cytological activities like vitellogenesis and occurrence of mature oocytes in the ovary. However, no significant alterations were noticed in the hepatocytes during post spawning phase due to the appearance of new germ line cells in the ovary. Cytological changes in the hepatocytes were correlated with the reproductive phases in female M. armatus.

Seasonal expression and distribution of kisspeptin1 (kiss1) in the ovary and testis of freshwater catfish, Clarias batrachus: A putative role in steroidogenesis

“…Seasonal variations in ovarian and testicular morphology and levels of sex steroids in C. batrachus are in agreement with the earlier reports on seasonally breeding teleost fishes (Chakrabarti and Chatterjee, 2014;Schulz et al, 2010;Singh et al, 2008) and also recently reported for the catfish, C.batrachus (Priyadarshini Lal, 2018; Singh nee Priyadarshini and Lal, 2018). However, increase in serum17β-estradiol during the later part of laterecrudescence phase (June) could be because of its more release from the ovary than its production.…”