Assessment of heavy metals in water, sediment and fish tissues, from ,Sharkia province, Egypt

Abstract

he present study was conducted to investigate factors affecting live fish at different sources of water (agriculture drainage, industrial drainage and sewage wastewater). Heavy metal residues (zinc, copper, lead, cadmium, chromium, aluminium, manganese, nikel and cobalt) were determined in water, sediment and fish organs (muscles, gills, kidney and liver tissues) of three fishes (Oreochromis niloticus, Clarias gariepinus and Bagrus bayad). The industrial drainage and sewage water revealed the highest concentrations of heavy metals followed by agriculture drainage water. The muscles, gills, kidney and liver tissues of fish samples collected from industrial drainage and sewage canals had the highest levels of heavy metal residues followed by agriculture drainage canals. The heavy metal studies revealed that there is a public health hazard associated with industrial drainage, sewage wastewater and agriculture drainage as the quality of fish did not comply with the standard levels recommended by WHO, USEPA and ANZECC. Potential adverse health effects in such applications could be avoided if the wastewater is sufficiently treated.

Seasonal Variations of Heavy Metals Content in Muscle and Viscera of Green-Lipped MusselPerna viridisFrom Da-Peng Bay Lagoon in Taiwan

“…The heavy metal concentrations were generally higher in the viscera. Data are similar to other studies in fish (El-Sayed et al, 2011;Sjarul, 2014) showing that heavy metals accumulate more in the viscera than in the muscle. The concentrations of Cu and Zn were considerably higher than other heavy metals.…”

Characterisation of production, marketing and consumption patterns of farmed tilapia in the Nile Delta of Egypt

“…The use of this water could be a potential source of pollution with heavy metals and/or pesticide residues particularly in the absence of water quality testing, connected ponds and no water filtration at the farm (Mansour and Sidky, 2002). It was found that concentration of pollutants in drainage water and fish organs was higher than the permissible limits (El-Sayed et al, 2011;Authman et al, 2013) and that the concentrations of some pesticide residues were higher in water drains than other sources (El-Kabbany et al, 2000;Mansour, 2009;Malhat and Nasr, 2013). However, results from analysis of tilapia samples from fish farms, indicated that the level of contamination of farmed tilapia from Kafrelsheikh fish farms with heavy metals and pesticides residues was below national and international maximum permissible limit (Eltholth et al, submitted for publication).…”

Dynamic Properties of the Predator–Prey Discontinuous Dynamical System

“…with the initial data (8) is more general than the problem (10) - (5) and has the discontinuous (integrable) solution So, we can call the systems (7) - (8) and (12) - (8) discontinuous dynamical systems (see [4]). …”