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Abstract
In Egypt, the Red Sea has a major importance in the production of fishes. Fishes appeared seasonally where there are more than 150 species recorded from the Red Sea (Al-Kholy, 1972). Fisheries in the Red Sea are of considerable socio-economic importance to the Red Sea countries in terms of national food security and income generation for rural communities.Fishes are one of the main sources of protein supply to man, as it can serve to solve the malnutrition and deficiency of proteins in the world. According to Norman (1951) fish contains proteins and fats which are easily digested by humans. The economic importance of fishes was represented in the food resources for the countries laying on the Red Sea shores (Al-Kholy, 1972).Marine fish parasitology is a rapidly developing field of aquatic science. This is due to the growing importance of marine aquaculture, concerns on pollution effects on fish health and a generally increasing interest in marine environmental biology (Moller and Anders, 1986). The marine environment encompasses a wide variety of biological, chemical and physical parameters, which if altered beyond acceptable limits, such as under culture conditions, may weaken the fish leading to disease outbreaks (Roberts, 1989). It is important, therefore,
that there is information on the occurrence of parasites of marine fish in their natural habitats (Roberts, 1989).Parasites are of economic importance in that they affect the productivity of fish through mortalities, decreasing growth rate, efficiency in feed conversion ratio and levels of the total plasma proteins due to a fall in absorbed amino acids that are essential for protein synthesis as well as lowering the quality of the meat (Fraser and Mays 1986).Williams (1967) recorded that, parasites of fishes may harm their hosts in a variety of ways: (a) by irritation of tissues and occlusion of the alimentary canal, blood vessels or other ducts. (b) By producing toxic products. (c) By depriving the fish from food. (d) By acting as vectors of pathogens. (e) By providing other pathogens.