Abstract
This study was aimed to estimate the prevalence the most common parasites genera infected some freshwater fishes in El-Abbassa, Abu-Hammad, Sharkia Governorate, Egypt with respect to level of water quality in ecosystems. A total of 1828 cultured fish species, represented as 694 Clarias gariepinus, 288 Cyprinus Carpio and 846 Oreochromis niloticus were collected seasonally from October 2015 to September 2017 were macroscopically examined, both externally and internally, for presence of parasites. Microscopic examination then conducted to identify the species. Results indicated that, the total prevalence of parasites among examined fish species representing as the following C. gariepinus O. niloticus C. Carpio, also can be ordered as the following: summer spring autumn winter. This study investigated that an analysis of fish-parasite fauna is very beneficial as prerequisite for awareness of preemptive and control against parasitic disease. The degrees of interactivity among parasites, as well as parameters of species richness point out that, structures of parasite communities are affected by the water pollutants level.
Highlights
Parasites are ubiquitous animals whose life cycle was dependent on one or several host organisms
A total of 1828 cultured fish species were represented as 694 Clarias gariepinus, 288 Cyprinus Carpio and 846 Oreochromis niloticus was collected seasonally from October 2015 to September 2017
The overall mean probe. Hydrogen ion concentration (pH) values was significantly higher at ponds water this may be due to the increase in pH value in water with high photosynthetic rate and the depletion of carbon dioxide
Summary
Parasites are ubiquitous animals whose life cycle was dependent on one or several host organisms. They are not merely passive passengers but active members of ecosystems. Cultured fish are continuously affected by environmental fluctuation and management practices such as fluctuating temperature, poor water quality and handling. Those factors could impose considerable stress on the homeostatic mechanisms of fish, rendering them susceptible to a wide variety of parasites (Pampoulie et al, 2004). Several factors play role in enhancing the susceptibility and damage caused by, diseases in fish farming operations. The present study aid to: 1) collect qualitative data on the parasitic fauna of the freshwater fishes in Egypt; 2) study seasonality of parasites according to prevalence with age and sex of the fish
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