Most of the world adopts the fishing as occupation. Many countries are working to search out the importance for men, such as for its oil, meat, scales. To get perfect nutrition, it is necessary that fishes must be healthy and free from parasitic and other diseases. The parasite infection tends to decrease the growth rate resulting in stunting of fishes. Today most of the researches are directed towards the diagnosis, description, biology, ecology and analysis of the diseases of marine fishes. The motivation for this importance increase on fish disease research is an attempt to avoid economic losses and to disclose the life histories of causative agents which may also interfere with human health. Here two new species of nematodes are described and reported and fish zoonosis is also discussed. This information is useful for students, teachers and researchers interested in the field of parasitology.