Abstract
Pollution of the ecosystem is a source of concern and wide attention globally. In this study, samples of water was collected and 50 fish samples of Carangoides bajad to assess the rate of water pollution of the coastal area of Rabigh on the coast of the Red Sea and that is due to its closeness to industrial activities. Concentrations of some heavy metals were assessed and was estimated as follows Zn> Fe > Pb (81 > 15.1 > 12.6 mu g/l, respectively) using atomic absorption spectrophotometer (Model AA-7000, Shimadzu, Japan). Using a light microscope, different types of endoparasites and ectoparasites were recognized in the chosen infected fish; in addition, a histological examination was conducted for some targeted organs (gills, intestines, liver). The results revealed that 40 fish were infected with subclass Copepoda Hatschekia (intensity 2); digenean parasites Bucephalus margaritae (intensity 4.36), Plagioporus ira (intensity 3.09), and Tergestia bengalensis (intensity 2.33); and Anisakis physeteris (intensity 12.57). The results revealed many histopathological changes which demonstrate the presence of potential risks on consumers due to pollution of the aquatic ecosystems. Therefore, continuous monitoring of these pollutants is an essential matter to ensure the safety of aquatic organisms and humans that rely on these aquatic resources.