Histomorphology and immunohistochemistry of adenocarcinoma and fibroma in Indian oil sardine (Sardinella longiceps Valenciennes, 1847) from Palk Bay, South-east coast of India

Abstract

A single specimen of Indian oil sardine <em>Sardinella longiceps </em>was observed with wart-like appearances in three different regions of the fish: one on the premaxillary part, and other two on the skin and at the vent region respectively. Mucosal tissues were expunged and preserved in 10 % neutral phosphate-buffered formalin for histological examination. Based on the histopathological analysis, lesions were identified as adenocarcinoma and fibroma on the premaxillary part and skin, respectively. Based on the immunohistochemistry, vimentin and cytokeratin-like proteins were demonstrated, suggesting that the wart-like extrusions were fibroma and adenocarcinoma respectively.