Impact of environmental parameters on fish condition and quality in Lake Edku,Egypt

Abstract

This study was carried out between May 2011 and February 2012 in order to determine the effect of environmental parameters on physical and chemical quality of water, fish condition as well as fish quality in Lake Edku. Fish condition; lengthweight relation, condition factor and hepatosomatic index of three cichlid species (O. niloticus, O. aureus and T. zillii) were studied. Also, fish quality as heavy metals accumulation and proximate body composition for muscle tissue of these species were estimated. Physico-chemical parameters were in normal ranges for fish culture and revealed that the lake water showed differences among different seasons. Concentrations of metals in fish muscles have been changed seasonally with higher values recorded during autumn and winter. However, these concentrations are still in the safety permissible levels for human consumption. The best condition and proximate body composition of fish were recorded in spring and winter seasons. According to the results of this study, the most important environmental parameters affecting water characteristics, fish condition and quality in Lake Edku were water temperature, nutrients and drainage water discharged into the lake.

Water Quality and Bacterial Load of Water and Tilapia Organs from Edku Lake

“…Where, station 3 was had the significantly (p > 0.05) increase than other stations of reactive phosphate are mostly because of drainage water enriched with phosphorous compounds. The concentration of all nutrients (NH4, NO2, NO3, OP4 & TP) in this study were higher than those recorded in the same lake by (Saeed, 2013;Okbah et al, 2017& El Morshedy, 2017.…”

Evaluation of Different Anthropogenic Effluents Impacts on the Water Quality Using Principal Component Analysis: A Case Study of Abu-Qir Bay-Alexandria-Egypt

“…The low value (0.74 µM) was measured at site II could be attributed to two factors; the first is the absence of dissolved oxygen that inhibits the rate of chemical oxidation of ammonia and the second is dissimilatory nitrate reduction to ammonium i.e. the reduction of nitrate to ammonia [35,40,41]. On other hand the high value of 36.74µM was measured at site VIII could be attributed to high amounts of organic fertilizers, industrial discharges [42,43], and also may be due to the absence of phytoplankton that inhibits the uptake of NO 3 by phytoplankton.…”

“…Moreover, stepwise regression analysis revealed that 97% of pH variability could be related to DO (pH = 4.55+0.499DO+0.452OOM+0.998T. alkalinity, r = 0.97, p ≤ 0.001) [35]. Moderately oxygenated seawater samples are mainly related to some other environmental factors.…”

“…On other hand the high value of 36.74µM was measured at site VIII could be attributed to high amounts of organic fertilizers, industrial discharges [42,43], and also may be due to the absence of phytoplankton that inhibits the uptake of NO 3 by phytoplankton. The low value (3.51µM) measured for seawater at site IX which produces high amounts of organic fertilizers wastes loaded with nitrite and nitrate maybe attributed to the reduction of nitrate to ammonia [34,35,41]. Obviously, the high value (13.51µM) measured for seawater at site X may be due to the absence of stratification and/or probably due to shallowness of the water column of the area [35,39].…”

“…The low value (3.51µM) measured for seawater at site IX which produces high amounts of organic fertilizers wastes loaded with nitrite and nitrate maybe attributed to the reduction of nitrate to ammonia [34,35,41]. Obviously, the high value (13.51µM) measured for seawater at site X may be due to the absence of stratification and/or probably due to shallowness of the water column of the area [35,39].…”