Aida Didaran; Gholam Hoseyn Vosoughi; Ali Mashinchian Moradi
Volume 6, Issue 1 , January 2022, , Pages 1-7
Abstract
Tiger Cuttlefish-Sepia pharaonis – Herenberg 1831-is a is a seafood species that belongs to five fishing stations in the Bahrakan Bay ( the waters of the Persian Gulf). 3specimens of Cuttlefish-Sepia pharaonis –, regardless of being male or female specimens, have been caught.The amount of ...
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Tiger Cuttlefish-Sepia pharaonis – Herenberg 1831-is a is a seafood species that belongs to five fishing stations in the Bahrakan Bay ( the waters of the Persian Gulf). 3specimens of Cuttlefish-Sepia pharaonis –, regardless of being male or female specimens, have been caught.The amount of these heavy metals by using atomic absorption spectrophotometer (AAS) was determined.The Range of concentrations of the heavy metals on the basis of dry weight, respectively is: The Concentrations of Cd, Cu, Pb in the samples of Cuttlefish -Sepia pharaonis- 0.54 to 0.25,3.98 to 2.12and from 0.09-0.03 (mg / kg)were measured. The level of contamination by heavy metals in Cuttlefish -Sepia pharaonis- of the Bahrakan Bay-Persian Gulf Shows that the amount of heavy metals in the species of Cuttlefish -Sepia pharaonis- that is studied on ,according to the standard of US FDA ,is within the limits permitted for human consumption and The results reveal that the concentration of the metals can be compared in this way: Cu>Pb> Cd. As a result of this study, acorrelation between climatic parameters (5 different locations of Cuttlefish -Sepia pharaonis-live in the Bahrakan Bay) and accumulation of heavy metals were found in the Cuttlefish -Sepia pharaonis-.To select the location of Cuttlefish-Sepia pharaonis – fishing as you go from the province of Khuzestan to Bushehr , the contamination by heavy metals: lead, copper, cadmium, in this fish will behigher.
S. Eisapor; Sh. Safaeian
Volume 6, Issue 1 , January 2022, , Pages 55-65
Abstract
In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N. For identifying identification of sponge samples, acid digestion method as a method of early detection ...
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In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N. For identifying identification of sponge samples, acid digestion method as a method of early detection and microtome section to identify the skeletal structure were used. All the identified sponges were from class Demospongia, two orders (Hadromerida, Haplosclerida) and four families (Clionidae, Callyspongidae, Chalinidae, Niphatidae) and seven species Amphimedon viridis, Haliclona rosea, Haliclona cinerea, Siphonochalina sp., Callyspongia fallax, Callyspongia sp.2, Cliona dioryssa. This Research is the exact study to the identification sponges in basis of microtome sectioning to observe skeletal structures in Iranian Island.
V. Zarepoor; E. Ezam; S Allahyaribeik
Volume 5, Issue 1 , January 2015, , Pages 1-13
Abstract
Thermocline layer have remarkable effects on acoustic propagation in Persian Gulf environment. So far, no comprehensive research has been conducted to explore thermocline layer, especially its characteristics including top, thickness, and thermal gradient of thermocline in Persian Gulf. Besides, effects ...
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Thermocline layer have remarkable effects on acoustic propagation in Persian Gulf environment. So far, no comprehensive research has been conducted to explore thermocline layer, especially its characteristics including top, thickness, and thermal gradient of thermocline in Persian Gulf. Besides, effects of thermocline on underwater acoustic propagation including transmission loss and sound channel formation in Persian Gulf have not been investigated as most studies to date have focused on the effect of thermocline on transmission loss in low frequencies, while high frequencies have been studied less. Accordingly, this study attempts to shed light on these ambiguities. ROPMI Cruise measurement data collected during summer (August) of 2001 in Persian Gulf were used in this study. To simulate the acoustic propagation, ray-tracing theory was also applied to make possible an analysis of high frequencies. Results showed that presence of thermocline layer have remarkable effects on transmission loss. Increasing the gradient in thermocline layer will raise transmission loss.
Volume 3, Issue 3 , July 2013, , Pages 133-140
Abstract
In the present study, a total of 595 specimens collected monthly in the northern part of Persian Gulf between November 2006 and October 2007 were examined by routine macroscopic and histological techniques. Monthly changes in the gonadosomatic index showed the spawning season extended within 2 peaks, ...
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In the present study, a total of 595 specimens collected monthly in the northern part of Persian Gulf between November 2006 and October 2007 were examined by routine macroscopic and histological techniques. Monthly changes in the gonadosomatic index showed the spawning season extended within 2 peaks, from April- May and September. The maturity stages are morphologically separated according to the changes in size, color and shape of the ovaries. Histologically, the oocytes development described the following stages; immature period (oogonia, early perinucleolus stage and late perinucleolus stage) maturation period (vacuolization stage, yolk granule stage, vitellogenic stage, germinal vesicle migration stage and mature yolk stage).The simultaneous presence of oocytes within ovaries indicated that this species is a batch spawner.
Volume 3, Issue 3 , July 2013, , Pages 141-148
Abstract
In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N.For identifying identification of sponge samples, acid digestion method as a method of early detection and ...
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In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N.For identifying identification of sponge samples, acid digestion method as a method of early detection and microtome section to identify the skeletal structure were used.All the identified sponges were from class Demospongia, two orders (Hadromerida, Haplosclerida) and four families (Clionidae,Callyspongidae, Chalinidae, Niphatidae) and seven speciesAmphimedonviridis,Haliclonarosea, Haliclonacinerea,Siphonochalina sp., Callyspongiafallax, Callyspongia sp.2,Clionadioryssa. This Research is the exact study to the identification sponges inbasis of microtome sectioning to observe skeletal structures in Iranian Island.
T. Taghikhany
Volume 3, Issue 2 , June 2013, , Pages 77-84
Abstract
The Sirri jacket offshore platform was designed and installed in Persian gulf of Iran in 1975 and has been in service since that time. The importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading ...
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The Sirri jacket offshore platform was designed and installed in Persian gulf of Iran in 1975 and has been in service since that time. The importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading has to be considered. In this paper, Magnetorheological (MR) fluid dampers have been proposed as a powerful tool to control seismic vibration of platform. A combination of four MR dampers and six friction pendulum isolators on the joints of cellar deck is applied for dynamic control of an existing steel jacket. In order to accurately evaluate the performance of Sirri jacket with MR dampers under Kobe seismic excitation, the platform numerically modeled in SACS software. The size of generated model with 198 degree-of-freedoms (DOFs) was dynamically reduced so as to be utilized in semi-active control algorithm. To this end, the stiffness, mass and damping matrices of the model has been reduced to the 25 DOFs model by programming in MATLAB software. The algorithm is used in this study for semi-active control of platform was H2/LQG. Comparison between dynamic response of the jacket with and without using semi-active controller showed a great difference in quantity of joints displacement and acceleration. As a consequence, cellar deck joints displacement and acceleration reduced about 50% in average. The results of using semi-active MR dampers showed that the earthquake-induced vibrations can be effectively suppressed by the isolation layer with MR dampers.
S. A. R. Hashemi; S. A. Taghavimotlagh; R. Ghorbani; A. Hedayati
Volume 3, Issue 1 , March 2013, , Pages 1-6
Abstract
During this study from December 2009 to November 2011, 363Deep flounder fish were caught and their weight and length were measured. The caught fish included 18 males, 200 females and 155 immature fishes. The mean, maximum and minimum total lengths were 264 ± 57 (mean ± SD), 415 mm and 115 ...
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During this study from December 2009 to November 2011, 363Deep flounder fish were caught and their weight and length were measured. The caught fish included 18 males, 200 females and 155 immature fishes. The mean, maximum and minimum total lengths were 264 ± 57 (mean ± SD), 415 mm and 115 mm respectively. The mean, maximum, and minimum total weights for this species were 238 ± 150 g, 827 g and 14 g respectively. The calculated length-weight relationships were W=0.000007FL3.09 (n=200, R2= 0.96) for the female, W=0.00002FL2.90 (n=18, R2=0.94) for the male and W=0.000009FL3.04 (n=363, R2 =0.96) for total fish. With a verified calculated b as 3 Student t-test showed no significant difference between calculated b and 3 (P>0.05), demonstrating that the growth pattern is isometric. Population parameters calculated for total fish were L∞= 42 (cm); K= 1 (year-1); t0= -0.14 and Ф’= 3.24. Based on the results, this species is classified as mediate vulnerable group fish.
S. Hamzehei; A.A. Bidokhti; M. S. Mortazavi; A. H. Gheiby
Volume 2, Issue 4 , December 2012, , Pages 225-232
Abstract
pollutions. Recently, both Persian Gulf and Gulf of Oman are experiencing several types of pollution including oil spills and heavy metal pollutions as well as Harmful Algal Bloom (HAB) caused by biological and environmental changes. Theiroccurrence of the red tide or harmful algal bloom during fall ...
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pollutions. Recently, both Persian Gulf and Gulf of Oman are experiencing several types of pollution including oil spills and heavy metal pollutions as well as Harmful Algal Bloom (HAB) caused by biological and environmental changes. Theiroccurrence of the red tide or harmful algal bloom during fall and winter 2008-2009 caused numerous unknown factors in the Strait of Hormuz, Persian Gulf and Gulf of Oman which left many destructive effects on fishery, aquaculture, tourism industry and environmental conditions of the region as some of them have not vanished absolutely yet. This paper deals with the analysis of application of the marine satellite imaging sensors to study and monitor the adverse environmental factors, particularly those associated with algal bloom occurred in 2008-2009. Data obtained by the MODIS sensors used to monitor the relevant environmental factors of the red tide. Our results showed that the occurred algal bloom was the result of seawater temperature drop, water circulation and the adverse environmental pollutions caused by industrial and urban sewages entering the coastal waters in this region of the Persian Gulf., This red tide phenomenon started in the Strait of Hormuz and eventually covered about 140,000 km2 of the Persian Gulf and total area of Strait of Hormuz. It survived for 9 months which is a record amongst the occurred algal blooms across the world.
S. M. R. Fatemi; P. Ghavam Mostafavi; F. Rafiee; M. Saeed Taheri
Volume 2, Issue 1 , March 2012, , Pages 101-106
Abstract
Rocky shores are one of the most important habitats of marine environment in coastal areas. They host marine organisms including seaweeds because of existence of strong and stable substrate for their growths. Intertidal rocky shores are a prominent feature on coastal areas of Qeshm Island located at ...
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Rocky shores are one of the most important habitats of marine environment in coastal areas. They host marine organisms including seaweeds because of existence of strong and stable substrate for their growths. Intertidal rocky shores are a prominent feature on coastal areas of Qeshm Island located at the northern part of Strait of Hormuz. In order to study biomass of seaweeds on rocky intertidal flats of this island, four stations in the south and one station in the northern part of the island were selected. Sampling was done for two periods, summer and winter. It was done during the low spring tide using a quadrate thrown manually and randomly at three times at upper, middle and lower parts of the flats with three replicates. Altogether 73 species of algae were collected and identified. These include 20 Chlorophyta, 10 Phaeophyta and 43 Rhodophyta. The maximum and minimum algal biomass of all stations was recorded in S4 station (117 g.m-2) and S5 station (24 g.m-2) with significant difference between the two stations (P<0.05). Also, the maximum algal biomass was observed for red algae (126g.m-2).
S. M. R. Fatemi; Gh. Vossughi; P. Ghavam Mostafavi; F. Bahri
Volume 2, Issue 1 , March 2012, , Pages 115-120
Abstract
Rocky shores are one of the most important habitats of marine environment in coastal areas. This study was done in 2010-2011 to investigate the diversity of true crabs in intertidal rocky shores of Qeshm island. Samples were collected from intertidal zones during the low-tide at 5 stations. The specimens ...
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Rocky shores are one of the most important habitats of marine environment in coastal areas. This study was done in 2010-2011 to investigate the diversity of true crabs in intertidal rocky shores of Qeshm island. Samples were collected from intertidal zones during the low-tide at 5 stations. The specimens were fixed in 70% Etanol and transferred to laboratory for identification. Altogether, 15 crab species belonging to 8 families and 14 genus were identified. 4 species were from Portunidae, 3 species from Eriphiidae, 2 species from Majidae,2 species from Grapsidae were identified. The others families including Euryplacidae, Leucociidae, Pilumnidae and Xanthidae families have the lowest species richness with only 1 species per family. Portunidae family with 4 species in intertidal zone had the highest species richness amongst studied stations. 3 species of Eriphia smithi from Eriphiidae family, Leptodius exaratus from Xanthidae family and Thalamita crenata from Portunidae family were present at all three intertidal zones (High tide, Mid tide and Low tide).
A. Mashinchian Moradi; Sh. Zirehpour; M. B. Bahadori; Gh. Vossughi; M. B. Nabavi
Volume 2, Issue 1 , March 2012, , Pages 129-134
Abstract
Total Petroleum Hydrocarbon ( TPH ) are environmental contaminants that are released into the marine environment through oil spills, industrial and domestic activities. TPH are readily transformed into more hydrophilic metabolites, which are accumulated in bile. Thus fish bile can be used as a biomarker ...
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Total Petroleum Hydrocarbon ( TPH ) are environmental contaminants that are released into the marine environment through oil spills, industrial and domestic activities. TPH are readily transformed into more hydrophilic metabolites, which are accumulated in bile. Thus fish bile can be used as a biomarker of exposure of fish to TPH in the marine environment. in this study several stations were selected from the Khure Mussa in the northern part of the Persian Gulf. Fish and sediment sampling were collected in the 2009. Preparation and analysis of the samples were performed according to MOOPAM method using Spectro florophotometer (UVF(. The highest average concentration of TPH in sediment was 364.91 mg/kg (dry weight) and was observed in Jafari station. The maximum concentration of TPH in bile liquid of fish (Euryglossa orientalis ) was 525 mg/l which was found in Zangi station. Statistical analysis revealed a significant differences between TPH concentration in sediment and in bileliquid of fish (Euryglossa orientalis ) in the study area (Pfish bile observed in this study suggests that fish bile can be used as a tool for bio-monitoring of TPH pollution.
S. Rahmani; P. Ghavam Mostafavi; M. H. Shahhosseiny; Gh. Vosoughi; A. Faraji
Volume 1, Issue 1 , December 2011, , Pages 43-50
Abstract
Coral reefs which form some of the most diverse ecosystems on Earth support many symbiotic relationships. Symbiodinium can provide up to 90% of a coral.s energy requirements. Temperature rise, turbid water and high salinity in the Persian Gulf were among the factors separating zooxanthellae from corals ...
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Coral reefs which form some of the most diverse ecosystems on Earth support many symbiotic relationships. Symbiodinium can provide up to 90% of a coral.s energy requirements. Temperature rise, turbid water and high salinity in the Persian Gulf were among the factors separating zooxanthellae from corals and result in bleaching phenomenon. Therefore, it is crucial to identify Symbiodinium of the Persian Gulf corals. Since zooxanthellae identification according to morphological characteristics is not precise enough, today, Symbiodinium different clades are identified using molecular techniques. In this study, Symbiodinium of genus Acropora as a dominant scleractinian coral in Farur Island, northern Persian Gulf were identified using molecular techniques. For this reason, sampling from depth of 7-10 meters was carried out. After DNA extraction, the target gene which was large subunit ribosomal RNA (28S rDNA) gene was amplified, using Polymerase Chain Reaction (PCR). Then the amplified fragments analyzed, by sequencing, and Symbiodinium clade was identified, using phylogenetic tree, and the situation of considered clade and its phylogenetic association with other studied samples in Iran and other parts of the world were defined. The
results showed that clade D was the only symbiont of Acropora off Farur Island. Since clade D is the most resistant clade against environmental changes, it is natural to identify this clade from Symbiodinium in Persian Gulf specific conditions.
P. Ghavam Mostafavi; Sh. Shahnavaz; M. Noroozi; M. R. Fatemi; M. H. Shahhosseiny; A. Mahvari
Volume 1, Issue 1 , December 2011, , Pages 69-73
Abstract
Nuclear markers such as microsatellites have allowed the identification of conservation and management populations of the Hawksbill turtles. In present study, eight microsatellite loci were studied. 60 samples of hawksbill turtles. flipper from Shidvar and Hormuz Islands have been surgically removed ...
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Nuclear markers such as microsatellites have allowed the identification of conservation and management populations of the Hawksbill turtles. In present study, eight microsatellite loci were studied. 60 samples of hawksbill turtles. flipper from Shidvar and Hormuz Islands have been surgically removed and preserved in 20% DMSO buffer. DNA was extracted using DNP KIT and amplified by PCR methods. The average number of alleles in Shidvar and Hormoz were 7 and 7.37 respectively with range of 7-13. The average expected and observed heterozygosity was 0.77 and 0.46 respectively. The linkage disequilibrium and deviations from Hardy-Weinberg equilibrium have been tested. The Fst values was 0.048, showing a significant difference between the two sites (P<0.01). The genetic distance between populations was found to be 0.27, which indicates that the genetic difference among the studied populations is pronounced. These results together with highly significant RST of genotypic differences between these pairs of samples support the existence of different genetic populations of Eretmochelys imbricata within the Iranian Islands of the Persian Gulf.