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Registros recuperados: 18
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Assessment of heavy metals and nonessential content of some edible and soft tissues OceanDocs
Ahdy, H.H.H.; Abdallah, A.M.; Tayel, F.T..
The level concentrations of heavy metals (essential and nonessential) were measured in different marine biota including cephalopoda, bivalve, crustacean and fish. The results reveal that these organisms show more or less the same order of distribution for each of the metals studied. The average concentrations of heavy metals exhibited the following decreasing order: cephalopoda > bivalve > crustacean > fish. The levels of metals in all studied samples are still comparable to those in their corresponding in the Mediterranean Sea. K (98-181μg/g) and Ca (547-1472 μg/g) were present at the highest concentrations in all investigated samples. Octopus and Sepia do not follow the general pattern. The highest value of Metal Pollution Index (MPI) in...
Tipo: Journal Contribution Palavras-chave: Field Study; Heavy metals; Marine crustaceans; Fish; Heavy metals; Fish; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_15903.
Ano: 2007 URL: http://hdl.handle.net/1834/1898
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Comparative study on octopus vulgaris (cuvier, 1797) from the mediterranean and red sea coasts of egypt OceanDocs
Riad, R.; Gabr, H.R..
Specimens from common octopus, Octopus vulgaris captured from the Red Sea and Mediterranean Sea showed significant differences in four of seven morphometric measurements .These differences are sufficient to recognize the populations of this species in the two habitats. The computed length-Wight relationship and condition factor for common octopus in both areas showed that representatives of this species from the Red Sea are heavier than those captured from the Mediterranean Sea for the same length group. Moreover, the natural mortality coefficient of Mediterranean representatives was comparatively higher than for the Red Sea octopus. This shows that the environmental conditions in the Red Sea are more suitable for O. vulgaris than in the Mediterranean Sea.
Tipo: Journal Contribution Palavras-chave: Field Study; Natural mortality; Octopus fisheries.
Ano: 2007 URL: http://hdl.handle.net/1834/2207
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Comparative study on octopus vulgaris (cuvier, 1797) from the mediterranean and red sea coasts of egypt OceanDocs
Gabr, H.R.; Riad, R..
Specimens from common octopus, Octopus vulgaris captured from the Red Sea and Mediterranean Sea showed significant differences in four of seven morphometric measurements .These differences are sufficient to recognize the populations of this species in the two habitats. The computed length-Wight relationship and condition factor for common octopus in both areas showed that representatives of this species from the Red Sea are heavier than those captured from the Mediterranean Sea for the same length group. Moreover, the natural mortality coefficient of Mediterranean representatives was comparatively higher than for the Red Sea octopus. This shows that the environmental conditions in the Red Sea are more suitable for O. vulgaris than in the Mediterranean Sea.
Tipo: Journal Contribution Palavras-chave: Field Study; Natural mortality; Octopus fisheries.
Ano: 2007 URL: http://hdl.handle.net/1834/2207
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Distribution and long-term historical changes of zooplankton assemblages in lake manzala (south mediterranean sea, egypt) OceanDocs
Mageed, A.A.A..
The northern lakes of Egypt have always acted as a buffer zone between the drainage system in the Nile Delta and the Mediterranean Sea. Most of these lakes are exposed to high inputs of industrial and domestic wastewater as well as agricultural drainage water, like Lake Manzala, which influence the living organisms on the long run. Samples of zooplankton were collected monthly from ten stations among Lake Manzala showing the different microhabitat of the lake. A one year monitoring has been carried out. Lake Manzala has been changed from marine ecosystem to eutrophic, nearly, freshwater system with the dominance of rotifers (cal ~ 97%). Twenty newly recorded zooplankton taxa were found for the first time in the lake during the study, while thirteen taxa...
Tipo: Journal Contribution Palavras-chave: Field Study; Zooplankton; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2007 URL: http://hdl.handle.net/1834/1901
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distribution of phosphorus fractions and some of heavy metals in surface sediments of burullus lagoon and adjacent mediterranean sea OceanDocs
Radwan, A.M.; Khalil, M.K.; El-Moselhy, K.M..
Twelve samples were collected from the surface sediments of lagoon and adjacent Mediterranean Sea. Samples were analyzed for grain size, total organic carbon (TOC), total carbonate (CaCO3), various forms of phosphorus and heavy metals (Fe, Mn, Zn, Cu, Ni, Co, Cd and Pb). The results indicated that the sediments were composed of sand, silt and clay enriched with carbonate (1.95 – 34.1%) and total organic carbon (0.06 and 3.62%). The total-P content ranged between 58 and 1186 μg/g, and the fraction associated with apatite minerals (PHCl) was the dominant (it constitutes about 50 – 73% of TP) implying that it was the main storage of phosphate. The various P phases demonstrated significant positive correlation with mean size, silt, clay, TOC, CaCO3 and TP,...
Tipo: Journal Contribution Palavras-chave: Field Study; Sediments; Heavy metals; Lagoons; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2007 URL: http://hdl.handle.net/1834/1888
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Ecological studies on fish farms of el-fayoum depression (egypt) OceanDocs
Konsowa, A.H..
This study was carried out at the fish farms of El-Fayioum province during 2003 farming season. They extend along the eastern bank of Lake Qarun. These farms derive its water and drainage wastes into Diar El-Berka Drain. pH values at the chosen farms ranged between 7.43 and 8.91 and its values are certainly optimum for fish culture. Salinity levels at fish farms adjacent to Lake Qarun (Goda 2, 9.5‰) are generally much higher than the other fishing ponds due to seepage from the lake water. The major nutrient concentrations (N & P) at the main feeder were much higher than the corresponding values at fish farms. Nitrogen concentrations that represented by NO2-N, NO3-N and NH4-N indicated the dominance of NH4-N over NO2-N and NO3-N at the selected fish...
Tipo: Journal Contribution Palavras-chave: Field Study; Phytoplankton; Water quality; Fish farms; Phytoplankton; Water quality; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061.
Ano: 2007 URL: http://hdl.handle.net/1834/1887
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evaluation of the microbial quality of the river nile waters at damietta branch, egypt OceanDocs
Sabae, S.Z.; Rabeh, S.A..
This study aims to the evaluation of the microbial quality of the River Nile water at Damietta Branch. Water samples were taken from the branch, during the period from autumn, 2005 till the summer of 2006. Some environmental parameters such as temperature, transparency, depth and pH were monitored. In addition, the bacteriological analyses involved total viable bacterial counts (TVBCs), total coliforms (TC) and estimation of faecal coliforms (FC), faecal streptococci and pathogenic bacteria. The results of physicochemical parameters showed that the temperature values varied from 17°C to 25°C and the transparency from 40cm to 220cm. Whereas, the depths varied from 3m to 25m and pH values from 7.24 to 8.44. The bacteriological analyses showed that TVBCs...
Tipo: Journal Contribution Palavras-chave: Field Study; Pollution; Pathogenic bacteria; Pollution; Pathogenic bacteria; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_34317.
Ano: 2007 URL: http://hdl.handle.net/1834/1899
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Impact of drainage water inflow on the environmental conditions and fishery resources of lake borollus OceanDocs
Al Sayes, A.; Radwan, A.; Shakweer, L..
The brackish water lake Borollus occupies a central position at the north between the two branches of the Nile delta. This lake has a particular importance in the fish economy of Egypt. Therefore environmental and fisheries investigation was carried out at the lake during 2000–2002, where 15 stations covering the whole area of the lake were sampled. The present study points out that: 1. The water transparency of the lake is low where the average Secchi disc depth ranged between 21.14 cm and 43.89 cm. 2. The average water temperature attained its minimum in winter and ranged between 16.20 °C and 17.80 °C. The highest temperature was in summer where it ranged between 28.33 °C and 28.52 °C. 3. The recorded pH values indicate that the lake water was generally...
Tipo: Journal Contribution Palavras-chave: Field Study; Brackish water; Fishery resources; Drainage water; Brackish water; Fishery resources; Drainage water; Http://aims.fao.org/aos/agrovoc/c_1049; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_2374.
Ano: 2007 URL: http://hdl.handle.net/1834/1906
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Induce spawning and larval reading of gilthead sea bream (sparus aurata)collected from fish farms, egypt OceanDocs
Aziz, F.K.; Zaki, M.I.; El-Absawy, M. El-G..
Sparus aurata females in captivity were injected with human chorionic gonadotropin hormone (HCG), pituitary extraction and both them during the spawning season. First hormonal treatment was applied as cumulative doses required for successful ovulation ranged from 4500 to 7500 IU\fish, the maximum fertilization percent was 71. The ovulation period under the influence of this treatment extended up to 14 days. In the second experiment, the total dose requirement for successful ovulation ranged from 2 to 4 pituitary extractions. Fish and the maximum fertilization percent recorded was 81, while the longest ovulation period obtained was 15 days. In the third experiment the total doses required for successful ovulation ranged from 2 pituitary extractions and 4500...
Tipo: Journal Contribution Palavras-chave: Field Study; Biological fertilization; Spawning; Hatching; Larval development; Survival; Spawning; Hatching; Survival.
Ano: 2007 URL: http://hdl.handle.net/1834/1908
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Influence of salinity variations on zooplankton community in el-mex bay, alexandria, egypt OceanDocs
Zakaria, H.Y.; Radwan, A.A.; Said, M.A..
El-Mex Bay receives a heavy load of waste waters (7×109 m3/year) both directly from industrial outfalls and indirectly from Lake Maryuit via El-Mex Pumping Station. Zooplankton samples were collected bimonthly from seven stations during the period March 2005 to January 2006 to illustrate the influence of salinity variations on the abundance and community structure of zooplankton in El-Mex Bay waters. Based on the salinity values, four water types are identified: the mixed land drainage (L) of salinity < 10ppt, mixed water (M) of salinity range 10 to 30ppt, diluted sea water (D) of salinity range 30 to 38.5 ppt and Mediterranean Sea water (S) of salinity > 38.5. The highest zooplankton standing crop (106.6×103 ind/m3) was recorded in the mixed land...
Tipo: Journal Contribution Palavras-chave: Field Study; Zooplankton; Salinity; Zooplankton; Salinity; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 2007 URL: http://hdl.handle.net/1834/2211
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Molecular genetic monitoring of bacterial communities in manzala lake, egypt, based on 16S rRNA gene analysis OceanDocs
El Saied, H.E..
A first molecular genetic study on the diversity of bacterial communities at Manzala Lake, Egypt, was determined by culture-independent 16S rRNA gene analysis. Bulk DNAs were extracted from water and sediment at two different sampling sites namely; Bashtir and Genka, in the lake. The 16S rRNA gene was positively amplified by polymerase chain reaction (PCR) from bulk DNA of each sample, cloned and sequenced. The sequence analysis of one hundred clones from each clone library obtained number of phylotypes ranged from 8 phylotypes, in Genka water, to 20 phylotypes in each of the sediment samples. The 16S rRNA gene showed diversity in sediment samples higher than in water samples. Based on Libshuff pairwise clone library comparisons, the 16S rRNA gene...
Tipo: Journal Contribution Palavras-chave: Field Study; Bacteria.
Ano: 2007 URL: http://hdl.handle.net/1834/2206
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Nutritive and antimicrobial profiles of some seagrasses from bardawil lake, egypt OceanDocs
Daboor, S.M.; Abd El-Hady, H.H.; Ghoniemy, A.E..
Seagrasses species in Bardawil Lake have been defined through broad quantitative sampling. From the biochemical constituent's point of view, two species namely; Cymodocea nodosa and Ruppia cirrhosa were evaluated as feed additives and antimicrobial active compounds. The obtained results showed an obvious increase in chlorophyll "a", carbohydrate and lipid contents in the C. nodosa than R. cirrhosa while protein contents was higher in R. cirrhosa than in C. nodosa. Whole plant tissues powder substance (10.0%w/v) and ethanolic extracts (200μg/ml) of C. nodosa and R. cirrhosa were evaluated against some microorganisms using pour plate technique. Powdered substance of C. nodosa was exhibited the highest antifungal activity than that of R. cirrhosa, also its...
Tipo: Journal Contribution Palavras-chave: Field Study; Pathogenic bacteria; Seagrass; Pathogenic bacteria; Http://aims.fao.org/aos/agrovoc/c_34317.
Ano: 2007 URL: http://hdl.handle.net/1834/2202
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on the distribution of zooplankton assemblaces in abu-qir bay, alexandria, egypt OceanDocs
Zakaria, H.Y..
Abu Qir Bay is a shallow semi-circular basin lying 35 Km east of Alexandria city. The bay is facing the problem of pollution which discharged into the bay from different sources; El-Tabia Pumping Station (TPS), the outlet of Idku Lake and the Rosetta mouth of the Nile River. Quantitative and qualitative studies of zooplankton community in Abu Qir Bay were performed seasonally during 2004. Fourteen stations were selected to represent the different habitats in the bay.The seasonal variations of zooplankton standing stock in Abu Qir Bay indicated that, the highest count (average 87.1x103 ind/m3) occurred during spring, while the lowest (average 44.2x103 ind/m3) was recorded in summer. The average zooplankton count during the period of study amounted to...
Tipo: Journal Contribution Palavras-chave: Field Study; Zooplankton; Coastal waters; Zooplankton; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_25205.
Ano: 2007 URL: http://hdl.handle.net/1834/1900
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Phytoplankton community in abu-qir bay as a hot spot on the southeastern mediterranean coast OceanDocs
Shams El-Din, N.G.; Dorgham, M.M..
The phytoplankton community in the stressed part of Abu Qir Bay was studied monthly relative to the prevailing ecological conditions from April 1998 to March 1999 at eight stations. The study recorded a total of 182 species of both fresh and marine origins, belonging to diatoms (89 species), chlorophytes (34 species), dinoflagellates (26 species), cyanophytes (18 species), euglenophytes (12 species), silicoflagellates (2 species), and cryptophyte (one species). Most of the recorded species occurred either seasonally or rarely, while small number of them appeared as persistent. The diversity of the phytoplankton community experienced wide variations on both monthly and spatial scales, accompanied by analogous variations in the diversity index, richness and...
Tipo: Journal Contribution Palavras-chave: Field Study; Phytoplankton; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2007 URL: http://hdl.handle.net/1834/1902
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Qualitative and quantitative study of copepods in damietta harbor, egypt OceanDocs
Ghobashi, A.E.; Abdel-Aziz, N.E.; Dorgham, M.M.; El-Tohami, W.S..
The qualitative and quantitative dynamics of the copepod community in Damietta Harbor was studied through zooplankton samples collected monthly from May 2003 to April 2004. The copepods community was represented by 21 species, belonging to calanoids (9 species), cyclopoids (5 species) and harpacticoids (7 species). A few species appeared to be persistent, while the majority of copepods were recorded either intermittently or rarely. The abundance of copepods showed wide range of variations (7x103 - 175 x103 organisms/ m3), and the annual cycle of the standing stock displayed bimodal peaks in June and August-September. The nauplii and copepodides constituted the bulk of copepods count (71.6% and 12.3% respectively). Of the adult forms, Oithona nana was the...
Tipo: Journal Contribution Palavras-chave: Field Study; Environmental conditions; Copepod culture; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 2007 URL: http://hdl.handle.net/1834/1907
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Sidementological and environmental impacts of development projects along the coast of hurghada, red sea, egypt OceanDocs
Mansour, A.M.; Mohamed, A.W.; El Dien, G.K.; Sayed, S.M..
The studies areas lay in Hurghada region include different aspects of coastal development. It represents different environmental problems and threats to the Red Sea ecosystem and geosystem. They include two tourist projects, a central marina for yachts and fishermen and a site for oil exploration and production. All sits have implemented Environmental Impact Assessment studies (EIA). Unfortunately, dredging and landfilling caused severe coast destruction and shoreline change in these areas. All sites have accurately surveyed and environmental problems cited, oceanographic parameters were measured, and 109 samples were collected from the beach and the tidal flat of four sits forming the study area. Grain size, carbonates and organic matter contents, major...
Tipo: Journal Contribution Palavras-chave: Field Study; Environmental conditions; Sedimentology; Coastal erosion.
Ano: 2007 URL: http://hdl.handle.net/1834/1904
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Status of coral reef affected by different impacts in some sites of the red sea OceanDocs
Ammar, M.S.A.; Ghobashi, A.A.; Omran, M.A.; Shaaban, A.M..
Using Using SCUBA diving, surveying the coral reef communities at four sites, Red Sea Egypt was done. These sites are: Ras El Behar (polluted by petroleum oil), El-Hamraween (impacted by phosphate shipping), Shabrour Umm Gam’ar (harmed by recreational activities and has been suffering from the outbreak of Acanthaster planci during 1998) and Kalawy (a control site). The skeletal growth of the coral Stylophora pistillata was promoted greatly at the expense of other corals, in presence of chronic oil pollution (Ras El-Behar). In contrast, this species was completely suppressed in presence of phosphate and sulphur enrichment. Petroleum oil led to coral scarcity, space monopolization by one coral and increased sea urchins and algae. Coral reefs enriched with...
Tipo: Journal Contribution Palavras-chave: Field Study; Coral reefs; Hydrocarbons; Phosphates; Coral reefs; Hydrocarbons; Phosphates; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_3719; Http://aims.fao.org/aos/agrovoc/c_35986.
Ano: 2007 URL: http://hdl.handle.net/1834/1909
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Steroid hormone in serum of male mugil cephalus from lake quaron in relation to ultrastructure of steroidogenic secreting tissue OceanDocs
Fahmy, A.F.; El-Gharabawy, M.M.; Assem, S.S..
The grey mullet (Mugil cephalus) is one of the most common fish species in the Mediterranean Sea. Morphological and histological studies on testes of this species indicate six successive maturity stages. The specific changes in serum sex hormone levels were found to occur during the different phases of gonadal development. Concentration of serum steroid hormone in male Mugil cephalus revealed a marked drop in serum steroid (estradiol and testosterone) hormone levels in nearly ripe stage when compared with ripe stage, while the concentration of estradiol, testosterone and progesterone at late stage (ripe stage) of sexual maturity was increased. Histological examination and cyclic change in the testes were revealed of active spermatogenesis with all...
Tipo: Journal Contribution Palavras-chave: Field Study; Ultrastructure; Mullet fisheries; Ultrastructure; Http://aims.fao.org/aos/agrovoc/c_8045.
Ano: 2007 URL: http://hdl.handle.net/1834/2201
Registros recuperados: 18
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