Abstract
This investigation was undertaken to study the histopathological changes in the intestine of catfish, Arius arius (Hamilton, 1822) from the Karachi coast due to the nematodes parasites. The sampling was carried out in December, 2014. The infected fishes were purchased from different fish markets and brought to the parasitology laboratory for further detailed investigation by using standard parasitological procedures. Four species of nematode parasites namely Raphidascaris acus (Bloch, 1779), Metabronema magnum (Taylor, 1925), Haplonema immutatum (Ward et Magath, 1917) and Hedruris bryttosi (Yamaguti, 1935) were recovered from the intestine and stomach of Arius arius (Hamilton, 1822). The histopathological changes include fibrosis, edema, epithelial necrosis, dilation of blood vessels and inflammation were recorded.
