B. Kiran Kumar, D. Vineela, S. Janardana Reddy*
Department of Fishery Science and Aquaculture, Sri Venkateswara University, Tirupati-517502, Andhra Pradesh, India
*Address for Corresponding Author
S. Janardana Reddy
Department of Fishery Science and Aquaculture
Sri Venkateswara University, Tirupati-517502, Andhra Pradesh, India
Background: It is well known that pesticides have become an important tool of modern agriculture to protect standing crops, stored grains and human belongings from pests and also help in preventing diseases. As a whole or in residual form, these pesticides make their entry into the aquatic ecosystem and pose a serious threat to the aquatic organisms in general and fishes in particular. The LC50 of Heptachlor was identified as 1.60 mg/L for 96h. Objective: The present investigation was undertaken to evaluate the effect of sublethal concentration of heptachlor on haematological and histopathological indices of Catla catla. Material and Methods: The fish were exposed to 3, 7, 15, 30 and 45 days and observed the significant modulations in haematological and histopathological indices in fresh water fish, Catla catla for 45 days exposure period. Modulations are discussed and highlighted with advanced literature. Results: In the present study LC50 of Heptachlor was determined as 1.60mg/L for 96 hours. The present study revealed that the sublethal concentration of heptachlor caused variations in haematological indices and Histomorpho and structural integrity of liver and kidney tissues of Catla catla for 3,7,15,30 and 45 days exposure periods. The RBC was significantly lower at for 45 days (2.67±0.21) when compared to control (4.32±0.14) and other treated groups. The maximum decrease in Hb% was recorded at 45 days (7.11±0.17) and higher value is observed in control group (11.86±0.24). The PCV % was recorded the maximum decrease was observed on day 45 (16.11±0.11) compared to control group (27.48 ± 1.18). The sublethal concentration of heptachlor caused drastic histmorphological variations in Liver and Kidney tissues of Catla catla. The Melanomacrophage Centers in Liver and kidney tissues are also significantly varied. Melanomacrophage Centers (MMC) also play an important role in the fish response to foreign materials including infection causing agents. Conclusion: It is obvious that the sub lethal concentration of heptachlor caused significant variations in haematological indices and irreversible modulations in histoarchitecture of liver and kidney of fish.
Keywords: Catla catla, haematology, heptachlor, histopathology, melano macrophage centres