The present study aims to describe the effect of heavy metals: copper, manganese, iron and zinc on the water quality of El-Bagouria Canal at Kafr El-Zayat region, El-Gharbiah Governorate. Seasonal variations of physico-chemical parameters were studied during the period from summer, 2013 to spring, 2014. Also, to study their effects on the different organs of the commercial fish species; Nile tilapia, Oreochromis niloticus by studying some of biochemical parameters of this fish species (total protein, total lipids, total carbohydrates, ASAT and ALAT) during the study period.Results revealed that, heavy metals in the water showed seasonal variations. Also, data exhibited the highest values of heavy metals in the different organs of O. niloticus were recorded during winter in the liver and kidney and the lowest were observed in the muscles. Biochemical analysis indicated devastating effects, especially enzymes activities, in the metabolic organs. Statistical analysis using analysis of variance (ANOVA, at p<0.05) based on data represent the measured values of heavy metals in the different organs of O. niloticus during the different seasons. One way analysis proved that, there were highly significant differences between the metals and between the different seasons also between different organs. On the other hand, two ways of ANOVA provided highly significant differences between organs and metals at the same seasons. While, non-significant differences were detected at the interactions between seasons and organs at the same metals and between seasons and metals at the same organs. One way analysis for biochemical parameters in the different organs of O. niloticus during the different seasons proved that, there were highly significant differences between the parameters. Meanwhile, there were significant differences between the different seasons and between target organs. Moreover, two ways of ANOVA provided highly significant differences between organs and parameters at the same seasons. While, non-significant differences were found at the interactions between seasons and organs at the same parameters and between seasons and parameters at the same organs.
INTRODUCTION Lake Qarun constitutes a very important sector in the Egyptian fisheries, for both significant total catch and a large number of economically important species. The lake is located in the Western Desert, between latitudes 29°24` and 20°33` North and longitudes 30°25` and 30°50` East. The lake has an area of about 55000 feddans (22000 hectares), or approximately 107 square kilometers. The lake is bounded by the cultivated lands to the South and West Desert to the north. The southern border of the lake forms the
The study aimed to determine the effects of wet salting, dry salting, and smoking processing methods on the heavy metal and mineral concentrations in the cultivated fish species which collected from private fish farms at Kafr El-Sheikh Governorate, Egypt, during winter, 2017. The impacts of fish processing on mineral contents of the raw and processed fish were significantly different (P ≤ 0.05). The maximum level of metals in the raw and processed fish samples (wet salted, dry salted, and smoked fish) were recorded for iron ion and the minimum level determined for cadmium ion. However, the highest sequences of the minerals in the raw and processed samples were obtained in this order Na > K > P > Ca. Regarding to processing methods, significant decreases occurred in the minerals of Ca, K, and P, but smaller decrease in the heavy metals of Cd, Cu, Fe, Mg, Ni, and Zn in the wet salted grass carp. In the dry salted mullet, the changes in the minerals and heavy metals are relatively small. However, the greatest changes are on smoked grass carp; most of the minerals, including Ca, K and P, except Na, significantly increased. In heavy metals, Cu, Fe, and Zn, except Mg and Ni, also significant increased.
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.
Knowledge of the endemic fauna of parasites in fish are of great importance, parasites could synergistically act as stressors to health of their hosts. The objectives of this study were to evaluate prevalence and effect of parasites on hematological, biochemical indices, injury of tissues and length weight relationship of Clarias, gariepinus. Water quality variables were measured and fishes were collected each seasons for examination most common parasites in infected fishes at Abbasa Fish Farm, Egypt. Results indicated that high summer water temperature was strongly associated with parasites infection. The hematological and biochemical analysis showed significant reduction in red blood cells (RBCs) count, hemoglobin (Hb) value, packed cell volume (PCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC), total protein, Albumin, Globulin and A/G ratio, while total white blood cells (WBCs) count, mean corpuscular volume (MCV), aspartate aminotransferase activity (ASAT), alanine aminotransferase activity (ALAT), urea, creatinine, uric acid and glucose were significantly increased in infested catfish. On other hands, histopathological examination of infected fish indicated, organs most affected by infection of parasites. Overall the tendencies observed in data showed the parasites have a strong effect on host fish and drifts observed for all variables showed a strong seasonal decoration.
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