Abstract
Wild rabbit fish (Siganus rivulatus) Forsskål (Teleostei, Siganidae) herbivores fish were collected from two sites (Dongnab and Swakin) on Sudanese Red Sea Coast during February 2010 - January 2011 and then examine for helminthes parasites. Microscopic anatomy of intestine with worms and without worms compared to each other. Helminth parasites belong to Procamallanus sp. The abundance of lymphocytes cell, eosinphils, red blood cells and goblet cells in parasitized intestine was significantly greater than in intestine without worms. Histopathological of intestine showed hyperplasia of mucosa, necrosis and hemorrhage in villi, hyperplasia of submucosa, cloudy swelling of columnar cells, melanomacrophage aggregation and separation of submucosa from muscular layer.