Abstract
The present study investigated the effects of lead nitrate on the histo-cytological changes in prolactin cells of Heteropneustes fossilis. Catfish were subjected to 657.6 and 164.4mg/L of lead nitrate for 96h and 28days, respectively. Blood from fish was collected on 24, 48, 72 and 96h in the short-term and after 7, 14, 21, and 28days in the long-term experiments. Blood was collected for analysis of calcium levels and pituitaries were fixed for histological studies. After short-term lead exposure, plasma calcium levels of fish remain unaffected at 24h. The levels exhibit a decrease after 48h which persists till end of the experiment (96h). Plasma calcium levels of fish exposed to lead for 7days exhibit a decrease. This decrease persists progressively till the end of the experiment (28days).Prolactin cells of the fish exposed to lead remain unaltered throughout the short-term experiment. Whereas in chronically exposed fish the prolactin cells remain unaffected till day 7. Nuclear volume of these cells exhibits an increase and cells are noticed degranulating after 14days of lead treatment. These changes are more pronounced 21days onward. Also, after 28days degeneration among prolactin cells is observed.
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