Nematodes from fishes of Balochistan are described here. This is the first report on the nematodes of fishes of Balochistan. Twenty four species of genus Rhabdochona Railliet, 1916 have been indentified based on morphometric variations in the important diagnostic features such as number of prostomal teeth, shape and size of spicules, number and position of caudal papillae in males and position of vaginal opening, structure of vagina and eggs morphology in females. This information is important for students, teachers and researchers in the field of fish parasitology.

Cybium guttatum is a popular marine edible fish commonly known as "surmai" in Pakistan. It also has export value. This fish has several parasitic infections including nematodes. Here the tissue damage is described in various organs of fish due to nematodes larvae of genus Anisakis. Histology sections of stomach, intestine and liver of infected fish were observed and reported here supported by photographs of damaged tissue. The organs were severely damage and changes in tissue morphology and architecture was prominent. This information is of valuable to students, teachers and research workers...

The presence of large number of parasites is dangerous for a fish population, causes great loss of fisheries and fishing industry. Economic aspects of parasitic effects on fishes are mass mortality, weight losses, reduction in fish population and size of catches. Fish disease due to helminth parasites has an indirect and direct effect on the productivity of fish and on human health. The main aim of present work is to provide knowledge about the seasonal variation, intensity of parasitic infection, effect of length and sex on the infestation rate as well as parasitic communities found in this...

The liver tissue damage in the catfish was observed. Lobular arrangement and central veins were obscured. Atrophy of liver tissue with large spaces in between was obvious. Portal tract areas were congested, hepatocyte cord arrangement and shape was disturbed. Section of nematode larvae apparently viable was present in liver tissue. Proliferation of the bile duct in portal tract area was obvious resulting into bile duct hyperplasia. Liver tissue appeared congested, loosing the usual arrangement of hepatocyte cord. Central veins were obliterated. Sinusoids were dilated due to atrophy of liver...

Tissue changes in stomach and intestine were observed associated with nematode larvae infection. This infection causes disintegration of cellular organization of these organs. The changes like, fusion, atrophy of villi, epithelial cells and villous epithelium, sloughing of villi, lengthening of crypt gland and erosion and dislocation of gastric mucosa and shrinkage of tissue has also observed with the infection of acanthocephala, trematode, protozoan and nematode larvae. Lesion and inflammation in stomach and intestine also produced. Severe host tissue reactions resulting into degeneration of...