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| Registros recuperados: 18 | |
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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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 |
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| Registros recuperados: 18 | |
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