This study was conducted to evaluate the impact of human activities on the ecological health and ... more This study was conducted to evaluate the impact of human activities on the ecological health and food chain at the shores of four Nile Islands in Great Cairo including El-Qeratten, El-Waraq, El-Zamalek, and El-Manial. Water quality, bacteria, phytoplankton, benthic algae, zooplankton, macrobenthic invertebrates, and bony fishes were examined at each island shore over two seasons including the lowest and the highest flow (February and July 2020, respectively). The obtained results showed that the average values of most of the chemicals in Nile Island’s water were within the Egyptian water quality limits. Discriminant analysis of physicochemical factors revealed a similarity between El-Waraq and El-Qerateen and between El-Manial and El-Zamalek. El-Qeratten was the most polluted island. It has the highest total and fecal coliform bacteria count (3.155 and 3.050 Log MPN/100 mL, respectively). El-Zamalek shores have the highest phytoplankton (33,582 cells × 104 L−1) and zooplankton count...
Fisheries assessment study based on the fishing activities is essential to attain reliable inform... more Fisheries assessment study based on the fishing activities is essential to attain reliable information for construction a management plan to achieve rational and sustainable exploitation. in the present study, spatial and landing site surveys were conducted and random fishing boats were examined to investigate their fishing gears characteristics, species composition, mean trophic level and catch per unit effort. Fishes were sampled and investigated for the gear selectivity study. The results indicate that trammel nets, gill nets and long-lines are the main fishing methods used. The lake exhibits spatial variations in its productivity and the time series of size and CPUE showed a high exploitation rate for the most important commercial fish species in the lake by the fishing gears used. Measures for fishery management based on gear selectivity are suggested for sustainability
International Journal of Fisheries and Aquatic Studies, 2017
Nile tilapia, Oreochromis niloticus is one of the most economically important African fish. The p... more Nile tilapia, Oreochromis niloticus is one of the most economically important African fish. The present study illustrates the current state of a selection program that mainly focuses on growth rate of farmed Nile Tilapia. Nile tilapia populations were collected from three geographically separated locations; Kafr El-Sheikh (K), Faiyum (F) and Serow (S). The selection based on fish age, condition factor and the genetic variation between populations; parents of two years, high Condition Factor (CF) and genetically distant parents were selected. Fish were fed on different nutrition regimes in different seasons. Simple Sequence repeats (SSR) technique was applied to assess the genetic variation between the studied populations. The molecular examination revealed that Kafr El-Sheikh (K) and Faiyum (F) populations are the most genetically distant populations with the lowest genetic similarity, 0.103. Therefore, two combinations of mating were done between (K) and (F), (F♀X K♂) and (F♂X K♀)....
The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (mo... more The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (more than 4000 individuals) of large elasmobranch species from 20 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The main species included in the archive are the devil fish (1 813 individuals), the basking shark (939 individuals), the blue shark (585 individuals) and the great white shark (337 individuals).In the last decades other species such as the shortfin mako (166 individuals), the spiny butterfly ray (138) and the thresher shark (174 individuals) were reported with an increasing frequency. This was possibly due to an increased public awareness on the conservation status of sharks, and a consequent development of new monitoring programmes. MEDLEM does not have a homogeneous reporting coverage throughout the Mediterranean and Black seas and it should be considered as a database of observed species presence. Scientific monitoring efforts in the...
The present study focused on the determination of the baseline data and correlations between biol... more The present study focused on the determination of the baseline data and correlations between biological and physicochemical variables, including the assessment of trophic conditions in Lake Qarun. The concentrations of nutrients were high, with the maxima usually in the east subarea (total nitrogen 6.40 mg dm
This study was conducted to evaluate the impact of human activities on the ecological health and ... more This study was conducted to evaluate the impact of human activities on the ecological health and food chain at the shores of four Nile Islands in Great Cairo including El-Qeratten, El-Waraq, El-Zamalek, and El-Manial. Water quality, bacteria, phytoplankton, benthic algae, zooplankton, macrobenthic invertebrates, and bony fishes were examined at each island shore over two seasons including the lowest and the highest flow (February and July 2020, respectively). The obtained results showed that the average values of most of the chemicals in Nile Island’s water were within the Egyptian water quality limits. Discriminant analysis of physicochemical factors revealed a similarity between El-Waraq and El-Qerateen and between El-Manial and El-Zamalek. El-Qeratten was the most polluted island. It has the highest total and fecal coliform bacteria count (3.155 and 3.050 Log MPN/100 mL, respectively). El-Zamalek shores have the highest phytoplankton (33,582 cells × 104 L−1) and zooplankton count...
Fisheries assessment study based on the fishing activities is essential to attain reliable inform... more Fisheries assessment study based on the fishing activities is essential to attain reliable information for construction a management plan to achieve rational and sustainable exploitation. in the present study, spatial and landing site surveys were conducted and random fishing boats were examined to investigate their fishing gears characteristics, species composition, mean trophic level and catch per unit effort. Fishes were sampled and investigated for the gear selectivity study. The results indicate that trammel nets, gill nets and long-lines are the main fishing methods used. The lake exhibits spatial variations in its productivity and the time series of size and CPUE showed a high exploitation rate for the most important commercial fish species in the lake by the fishing gears used. Measures for fishery management based on gear selectivity are suggested for sustainability
International Journal of Fisheries and Aquatic Studies, 2017
Nile tilapia, Oreochromis niloticus is one of the most economically important African fish. The p... more Nile tilapia, Oreochromis niloticus is one of the most economically important African fish. The present study illustrates the current state of a selection program that mainly focuses on growth rate of farmed Nile Tilapia. Nile tilapia populations were collected from three geographically separated locations; Kafr El-Sheikh (K), Faiyum (F) and Serow (S). The selection based on fish age, condition factor and the genetic variation between populations; parents of two years, high Condition Factor (CF) and genetically distant parents were selected. Fish were fed on different nutrition regimes in different seasons. Simple Sequence repeats (SSR) technique was applied to assess the genetic variation between the studied populations. The molecular examination revealed that Kafr El-Sheikh (K) and Faiyum (F) populations are the most genetically distant populations with the lowest genetic similarity, 0.103. Therefore, two combinations of mating were done between (K) and (F), (F♀X K♂) and (F♂X K♀)....
The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (mo... more The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (more than 4000 individuals) of large elasmobranch species from 20 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The main species included in the archive are the devil fish (1 813 individuals), the basking shark (939 individuals), the blue shark (585 individuals) and the great white shark (337 individuals).In the last decades other species such as the shortfin mako (166 individuals), the spiny butterfly ray (138) and the thresher shark (174 individuals) were reported with an increasing frequency. This was possibly due to an increased public awareness on the conservation status of sharks, and a consequent development of new monitoring programmes. MEDLEM does not have a homogeneous reporting coverage throughout the Mediterranean and Black seas and it should be considered as a database of observed species presence. Scientific monitoring efforts in the...
The present study focused on the determination of the baseline data and correlations between biol... more The present study focused on the determination of the baseline data and correlations between biological and physicochemical variables, including the assessment of trophic conditions in Lake Qarun. The concentrations of nutrients were high, with the maxima usually in the east subarea (total nitrogen 6.40 mg dm
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