The pathology caused by <i>Pomphorhynchus laevis</i> Müller in the alimentary tract of the stone loach, <i>Noemacheilus barbatulus</i> (L.)

Abstract

Abstract. Changes induced in intestinal and rectal structure of the stone loach, Noemacheilus barbatulus (L.) by Pomphorhynchus laevis Müller infection are described. Within the gut, the main effect of the infection is the abrasion and flattening of the mucosa by the parasite. Where the praesoma penetrates the gut wall, there is a marked inflammatory response. This inflammatory response tissue is well vascularized and displays esterase activity. Granulocytes and phagocytic cells, which are found both within the inflammation tissue and within capillaries, are probably host leucocytes. The integument of P. laevis appears undamaged by granulocytes in its proximity and it is unlikely that the host's inflammatory response is capable of rejecting the parasite.