Pedram Mahdavi; Hossein Ghorbanizadeh Kharazi; Hossein Eslami; Narges Zohrabi; Majid Razaz
Abstract
This study was conducted using continuous hydrological modeling available in HEC-HMS model with respect to SMA method for Zard River basin in Iran. To perform the HEC-HMS model in the present study, spatial data such as soil map, digital elevation model, land use land cover map were used to define catchment ...
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This study was conducted using continuous hydrological modeling available in HEC-HMS model with respect to SMA method for Zard River basin in Iran. To perform the HEC-HMS model in the present study, spatial data such as soil map, digital elevation model, land use land cover map were used to define catchment boundary and other physiological characteristics of basin. The model was calibrated for period of 1975-1978 and it was validated for the period of 1978-80. The evaluation of calibrated model showed that the performance of the model ranges from good to very good with a coefficient of determination for monthly volumes =0.92, Log =0.93, Percentage error for monthly volumes (PEV)=1%, Root Mean Square Error of daily peak flows (RMSE)=8.5(m^3/s) and Mean Absolute Error of daily peak flows (MAE)=3.2(m^3/s). Sensitivity analysis showed that soil storage and tension storage are most sensitive parameters and initial GW2 content and GW2 percolation are least sensitive parameters in the model. From the results it can be concluded that SMA method in HEC-HMS conceptual model perform good enough and can be used for continuous long-term rainfall-runoff modeling in Zard River basin.
مهندسی دریا
Hamed Jalil Masir; Rohollah Fattahi; Elham Ghanbari Adivi
Abstract
Sediment transport phenomenon is considered as one of the important and Effective factors in hydraulic performance and morphological structure of the coasts. In addition, stable development, engineering proceedings and the selection of the most appropriate protection method for organization and stabilization ...
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Sediment transport phenomenon is considered as one of the important and Effective factors in hydraulic performance and morphological structure of the coasts. In addition, stable development, engineering proceedings and the selection of the most appropriate protection method for organization and stabilization of the coast, are depends on the quantity of sediment load. Therefore, the focus of this study is generally to estimate sediment transport rate, assess the impact of coastal forest cover (Green Belt) on decreasing sediment transport rate exposed to tsunami wave trend and to obtain the parametric model to each coastal area using SPSS software. Experiments were performed on the effectiveness of a mangrove tree to reduce tsunami energy, by a simulated polyethylene synthetic shrub structure, for two rectangular and triangular tree layouts, 3 input wave height of 6, 9 and 12 cm, constant and horizontal slope of the coast, 0.35 mm sediment diameter and in terms of presence and absence of cover.. The results of this study show that despite forest cover, 41.17% of coastal erosion and scour are prevented and it helps to stabilization and restoration the coasts. Also considering conditions such as triangular layout selection and increasing cover density, 7.57% and 11.20% respectively, leading to the improvement of the coastal condition. Finally, the parametric model and the experimental equation for estimating the sediment transport rate with the correlation coefficient equal to 0.95, proposed as well.
علوم انسانی دریا
Somayeh Emadi; Zohrab Gohari; Mohammad Sajjadian
Abstract
The purpose of this study was to design a strategic map and implement swimming sports strategies in Fars province with a balanced scorecard approach. The research method is descriptive and applied in terms of purpose. Research data were collected in the field and in a mixed manner (quantitative and qualitative). ...
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The purpose of this study was to design a strategic map and implement swimming sports strategies in Fars province with a balanced scorecard approach. The research method is descriptive and applied in terms of purpose. Research data were collected in the field and in a mixed manner (quantitative and qualitative). The statistical population in the quantitative part, including the heads of the swimming boards of the province and cities and the managers of the clubs, was equal to 60 people and in the qualitative part, 12 experts. Due to the limitation of members, the statistical population was equal to the sample. The research tool was a researcher-made questionnaire whose validity was confirmed by 10 university professors and its reliability was confirmed by Cronbach's alpha test. (86/0 = α). Frequency percentage, logical induction method and strategic council were used to analyze the data. The results showed that in swimming province of Fars province, there are 4 perspectives of finance and development, customer, internal processes and growth and learning, 35 strategic goals and 38 criteria of determination. And 47 actions and initiatives were developed to achieve the goals. It can be concluded that the proposed model, in addition to implementing the strategy, has the ability to create the ground for achieving the long-term goals of Persian swimming.
Yasaman Khamechin; Ramin Manaffar; Amir Tokmechi; Vida Hojati; Omid Maleki Balajoo
Volume 12, Issue 2 , April 2014, , Pages 56-47
Abstract
Artemia mainly due to its nutrition value and also its merits has been considerate very in research biology and aquaculture. L-carnitine as a food supplement which stimulates the fatty acids oxidation and its affect on increasing of the nitrogen retention and stimulation of resistance against the environmental ...
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Artemia mainly due to its nutrition value and also its merits has been considerate very in research biology and aquaculture. L-carnitine as a food supplement which stimulates the fatty acids oxidation and its affect on increasing of the nitrogen retention and stimulation of resistance against the environmental stresses is used lately in modern aquaculture. In order to study of the effect of dietary L-carnitine supplementationon the growth performance, survival rate and early maturation of parthenogenetic Artemia, treatments were done by 1, 10, 100, 1000mg/l of L-carnitine supplement. The cysts of parthenogenetic Artemia were hatched in optimal conditions. Acquired larvae were fed as long as 15 days with a compound of enriched yeast with HUFA and the alga Dunaliella tertioleca in salinity of 80g/l. L-carnitine supplement was added directly in culture medium and indirectly added by enrichment the algae were fed by specimens. Results revealed that this supplement can stimulate early sexual maturation and aggravates masculinization in all of the experimental groups in comparison with the control group. The best result, in this regard was recorded for 1000 mg concentration of L-carnitine in which at 13th days the best percentage of sexual maturation, 5/04%, was seen. These results showed that L-carnitine has significant effect on growth performance when it exposes in 1000 mg concentration of L-carnitine, also the fatty acids profile in any of these concentration fatty acids DHA is not be.
علوم زیستی دریا
Morteza Ziyaadini; Ali Mehdinia; Zahra Yousofiyanpour
Abstract
Mollusks are remarkably appropriate as a bio-indicator due to their wide geographical distribution, high abundance in benthic environments, selective absorption of certain ions and their motionless nature. Chiton, a mollusk of the phylum of Polyplacophora, and of its lamyi species is abundant in Chabahar ...
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Mollusks are remarkably appropriate as a bio-indicator due to their wide geographical distribution, high abundance in benthic environments, selective absorption of certain ions and their motionless nature. Chiton, a mollusk of the phylum of Polyplacophora, and of its lamyi species is abundant in Chabahar Bay coastal rocks. Based on previous studies, this animal can be introduced as a potential indicator of Ecosystem Health; hence Chiton was chosen to be investigated rate of accumulation of metals, Cd, Cu, As and Hg in Chabahar Bay. After sampling four major stations, the samples were prepared and Cold Vapor Atomic Absorption apparatus were used for measurement of mercury and graphite furnace method was used for measuring other metals. Then, using the obtained data, bioaccumulation factor was calculated for each metal separately in the maximum amount of cadmium bioaccumulation factor at station 4 (Great sea) (136.34±0.02) and the lowest mercury at station 2 (Coast of Maritime University) (1.88±0.02), respectively. After statistical analysis of the results, it was found that Chiton can be introduced as a bio-indicator of the mentioned contaminants in the coast of Chabahar Bay.
علوم زیستی دریا
mehrshad bahador; Abbas Moradi; Abolfazl Naji
Abstract
Toxicity of trace metals in the environment, bioaccumulation in aquatic environments and in food chains are of great importance.This study concentrates on the distribution patterns of some heavy metals (Pb, Ni, Zn and Fe) in surface sediments of Shoor River estuary. In order to determine the degree of ...
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Toxicity of trace metals in the environment, bioaccumulation in aquatic environments and in food chains are of great importance.This study concentrates on the distribution patterns of some heavy metals (Pb, Ni, Zn and Fe) in surface sediments of Shoor River estuary. In order to determine the degree of Contamination and environmental quality of region sediments, surface sediment (0-5 cm) samples were collected from 4 stations. At each station, three surface sediment samples were collected and the concentration of heavy metals were measured using a flame Atomic Absorption Spectrophotometer; Then indexes such as the Pollution Load Index (PLI) and Potential ecological risk index (RI) for each of the sampling stations and study area applied. The results of PLI represented the low accumulation of studied metals in the surface sediments of the area. Potential ecological risk was also low. The results indicated that Zn and Ni were mainly from anthropogenic discharge, while a significant portion of Pb and Fe were likely from natural inputs.Overall, frequent adverse effects were expected for Ni and occasional adverse biological effects are expected for Zn, whereas for Pb and Fe rare adverse biological effects are expected. Pearson’s correlation indicated that there was positive correlation betweenNi, Pb, Fe, TOM and fine grain size(p
علوم انسانی دریا
Shiva Shakeri; Homayoun Yousefi; Damoon Razmjooei; Mohammad Amin Kouhbo
Abstract
This research surveys Khorramshahr port solutions about empty container crisis and identifies reasons for adopting strategies and effective factors on it. At first, the researcher attended the Khorramshar container terminal while observed empty container management procedure and interviewing with responsible ...
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This research surveys Khorramshahr port solutions about empty container crisis and identifies reasons for adopting strategies and effective factors on it. At first, the researcher attended the Khorramshar container terminal while observed empty container management procedure and interviewing with responsible persons of Khorrmshahr container terminal and container shipping company Hoopad Darya. During the interviews, the researcher could find information about possible solutions for empty container management. After detecting possible management strategies for decreasing amount of empty container movements and it’s costs, strategies prioritized by aid of industry experts and using AHP method. Finally, the amount of export and trade imbalances recognized as the important factors for accumulation of empty containers. This research based on objective is an applied research and based on nature is mixed research. The results of research shows that the best way of empty container management is creating private yards outside Khorramshahr areas and completing dry port and land transportation of empty containers to Immam Khomayni port. Final part of research is offering applied suggestions.
علوم زیستی دریا
Mohammad Ahmadi; Preeta Kochanian; Hassan Salehi; Vahid Yavari; Seyed Hosein Hoseinifar
Abstract
Risk identification and consideration are vital for development and future planning of shrimp aquaculture. For survey of production and development characteristics of shrimp hatcheries in Iran, a questionnaire was prepared based on international standards and references, and several stockholders of shrimp ...
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Risk identification and consideration are vital for development and future planning of shrimp aquaculture. For survey of production and development characteristics of shrimp hatcheries in Iran, a questionnaire was prepared based on international standards and references, and several stockholders of shrimp hatcheries were consulted. Results indicated that feed, foreign technician, and financial resources is the major challenges of Iranian shrimp hatcheries. Major objective of this research was to obtain opinions and experiences of stockholders that active in shrimp hatcheries in Iran. Indentification of present challenges of Iranian shrimp hatcheries was another objective of the study. Creating a ground for cooperation between the Universities, industry and State administration is important to identify the issues existing in the shrimp culture industry and to put forward practical and feasible solutions. The ground that each section trust other and see “otherness experience” as own experience. It is needs reconstruction and redefinition of experiences and concepts in this framework.
علوم زیستی دریا
Mehran Parsa; Seyed Yousef Paighambari; Ehsan Kamrani; Ali Nekuru
Abstract
CPUE, CPUA and biomass of Pomadasyskaakanassessed in the waters of Bushehr province in 2011. The study area was divided into three areas (Northern, Central and Southern) and depth zones (10-20, 20-30 and 30-50 m). In this study,a stratified random sampling was used to collect data. Samples were taken ...
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CPUE, CPUA and biomass of Pomadasyskaakanassessed in the waters of Bushehr province in 2011. The study area was divided into three areas (Northern, Central and Southern) and depth zones (10-20, 20-30 and 30-50 m). In this study,a stratified random sampling was used to collect data. Samples were taken from 45 stations. Total length and mean total length were calculated 27-56 cm and 42.7±4.95 cm, respectively. Total biomass was estimated to be approximately 5943.55 tonnes. Total CPUE and total CPUA were calculated 803.25 kg/h and 9269.05 kg/nm2, respectively. The lowest mean CPUE was observed in 20-30 m depth zone with 8.82 kg/h and the highest mean CPUE was observed in 10-20 m depth zone with 21.45 kg/h. The lowest and highest mean CPUA were calculated in 20-30 m depth zone with 95.91 kg/nm2 and 10-20 m depth zone with 259.35 kg/nm2, respectively. Also, the central area of Bushehr province showed the highest CPUA with 8913.9 kg/nm2. The results of this study showed that the highest distribution and biomass of Pomadasyskaakanare concentrated in the central areas and 30-50 m depth zones.
علوم زیستی دریا
zahra zarei Jeliani; Morteza Yusef Zadi; jelveh sohrabipour; hojjat toiserkani
Abstract
Seaweed is favored seafood in some regions and is also used as feedstock for extracting fine chemicals. The total global seaweed production continues to grow This study investigated the biological activities of n-Hexane, Ethylacetate and Methanol extract of two red marine macro algae (Gracilariopsis ...
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Seaweed is favored seafood in some regions and is also used as feedstock for extracting fine chemicals. The total global seaweed production continues to grow This study investigated the biological activities of n-Hexane, Ethylacetate and Methanol extract of two red marine macro algae (Gracilariopsis persica and Hypnea flagelliformis), collected from the coast of Bandar Abbas, Persian Gulf, Iran. For identification the superior species with biological properties, the tested activities included Carotenoids content, total Phenolic content, total flavonoids content, antioxidant activity at the concentration (3 mg/ml) by ferric reducing power (FRP) and total antioxidant capacity (TAC) assay and at final, antibacterial activity was evaluated. This study revealed that the more effective macro algae extracts by maximum antioxidant capacity: FRP and TAC, were recorded for Ethylacetate extracts. The result showed the highest content of phenolic and flavonoid compounds were recorded for the Methanol extracts of Gp. persica, 45.12±0.01 (mg GA/gr DW) and 2.28±0.007 (mg QE /gr DW), respectively while H. flagelliformis showed the maximum Carotenoid content 17±0.06 (mg 100g-1). In addition, the highest antibacterial activity was recorded for the n-hexane and followed by Ethylacetate extracts. In general comparison, though, according to the results, antioxidant and antibacterial activity of species in this study were calculated less than standard, but could be accounted these seaweeds as safe biological properties and with abundance of them in coastal of Bandar Abbas, could be considered for future applications in medicine and dietary supplements.
علوم زیستی دریا
حنان آلبوخنفر; ابراهیم رجب زاده قطرمی; آیناز خدانظری
Abstract
In this study, the effect of cooking and pre-cooking methods was done on quality and sensory factors of peeled and un peeled whiteleg western shrimp. Free fatty acids, pH indices, TBARs, volatile nitrogen bubbles (TVB-N) and sensory factors such as tissue, Odor, taste were evaluated during 16 days of ...
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In this study, the effect of cooking and pre-cooking methods was done on quality and sensory factors of peeled and un peeled whiteleg western shrimp. Free fatty acids, pH indices, TBARs, volatile nitrogen bubbles (TVB-N) and sensory factors such as tissue, Odor, taste were evaluated during 16 days of storage at -18 ° C. Cooking and pre-cooking of shrimp were done by boiling, in which the shrimp was heated to 80 ° C for 5 minutes to cooking and 3 minutes to pre-cooking. The lowest of factors such thiobarbituric acid was in unpeeled raw shrimp and the highest in peeled cooking, for pH in unpeeled raw shrimp and peeled cooking, for TVB-N, unpeeled raw shrimp and the highest in peeled cooking and for FFA index peeled cooking and the highest in peeled raw shrimp. The results showed heating would maintain the quality indices during the maintenance period.
علوم زیستی دریا
Abdolah Gurani; Iman Sourinejad; Mohsen Safaei; Zahra Ghasemi
Abstract
Feeding habits and feeding indices of catfish Plicofollis tenuispinis (Pay, 1877) in coastal waters of Qeshm island around Gouran region were studied during May 2016 to April 2017 by sampling 15 fish per month throughout one year. Mean value of fish fork length was 24.43 ± 2.52 cm. Relationship ...
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Feeding habits and feeding indices of catfish Plicofollis tenuispinis (Pay, 1877) in coastal waters of Qeshm island around Gouran region were studied during May 2016 to April 2017 by sampling 15 fish per month throughout one year. Mean value of fish fork length was 24.43 ± 2.52 cm. Relationship between fork length and total weight was determined as W=0.012 FL3.066, which considering the amount of b, indicates the isometric growth of P. tenuispinis. The highest amount of gastrosomatic index was in spring and the lowest was in winter revealing that the highest feeding intensity was in spring for this species in coastal waters of western Qeshm island. Mean value of vacuity index was calculated 35.01 ± 15.91 for this species that ranks this species as a relatively edacious species. Season based analysis of VI data indicated that the lowest amount of VI or the highest number of full stomachs was in spring. Evaluation of food preference index showed that fish, shrimp, bivalves, crabs, mollusks and algae constituted 52.45, 21.31, 5.73, 4.91, 3.27 and 0.81 percent of stomach contents, respectively. Therefore, fish were the main and shrimps were the second prey priority. Crabs, bivalves, mollusks and algae were the accidental preys consumed by this species. Index of relative length of gut was 2.08± 0.26 indicating that P. tenuispinis is omnivorous in coastal waters of western Qeshm island.
علوم زیستی دریا
Ainaz Khodanazary; Abdolmajid Hajomoradloo; Rasool Ghorbani
Abstract
The aim of this study was to investigate the effect of solid-state fermentation on quality properties, enzyme activity and apparent digestibility of nutrients of Kilka Anchovy. Kilka Anchovy meal were mixed with 25% wheat flour and inoculated with microorganisms (108 cell/ml) and kept in an incubator ...
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The aim of this study was to investigate the effect of solid-state fermentation on quality properties, enzyme activity and apparent digestibility of nutrients of Kilka Anchovy. Kilka Anchovy meal were mixed with 25% wheat flour and inoculated with microorganisms (108 cell/ml) and kept in an incubator for 14 days at 37 ºC. Comparison of oxidation and hydrolysis indexes at Kilka Anchovy silage inoculated with microorganisms showed that S. cerevisiae was the lower free fatty acid (7.62 µ mole/g fish) and peroxide (12.47 meq peroxide/1000g oil). The lowest nitrogen non protein of Anchovy Kilka silagr was shown with fish silage inoculated with L. plantarum and B. subtilis. The lowest thiobarbituric acid (8.40 mg malonaldehyde/ kg) was showed at fish silage inoculated with fungi A. niger. The highest α-amylase and acidic protease activites was shown at fish silage inoculated with fungi A. niger and yeasts (S. cerevisiae and S. carlesbergensis), respectively. The in vitro digestibility of dry matter and crude protein with different levels of the fish silage increased. The highest of in vitro digestibility of dry matter and crude protein was related to S. cerevisiae (P>0.05). Generally, the results showed that S. cerevisiae had the best quality properties, enzyme activity and digestibility of nutrient of fermented silage compared with other fish silage inoculated with other micoorganisms.
علوم زیستی دریا
Rezvan Khavari; Fatemeh Mosavi
Abstract
Abkharvar Behbahan channel is 7 km long in Behbahan Plain located in arid and semi-arid area and it is limited in terms of water resources, therefore it is very important to preserve the quality of water resources and prevent them from being polluted. In order to investigate the pollution level of Abkharvar ...
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Abkharvar Behbahan channel is 7 km long in Behbahan Plain located in arid and semi-arid area and it is limited in terms of water resources, therefore it is very important to preserve the quality of water resources and prevent them from being polluted. In order to investigate the pollution level of Abkharvar Cannel, sampling operations were carried out from 6 locations in the studied area. Water samples to determine the concentration of heavy elements As, Fe, Pb, Se, Zn, Mn, Cr, anions Cl-, SO42-, NO3-, CO3-, HCO3-, and cations Ca2+, Na+, Mg2+, K+, and important water quality parameters including Ph, EC and TDS were analyzed by ICP-OES, FAES, OAS, titration, drying and conductivity methods. The pH levels in all samples are within the WHO standard and the standard of wastewater discharged to surface water and agricultural uses. The concentration of SO42- anion and Mg2+, Na+, Ca2+ cations and important water quality factors including EC, TDS in the sample taken from the Maroon River (S6) is higher than the WHO drinking water limit. Geochemical data show that the water chemistry in the region is strongly influenced by factors such as the entry of industrial and human wastewater into this chanel, as well as the dissolution of carbonate rocks and evaporative sediments containing gypsum, calcite, and halite minerals along the Abkharvar Behbahan channel.
Iman Sourinejad; Mohammad Reza Kalbassi
Volume 11, Issue 2 , November 2012, , Pages 45-57
Abstract
Conservation of genetic diversity of juveniles used for restocking of natural populations requires serious attention in artificial breeding protocol of the Caspian brown trout Salmo trutta caspius. Unbalanced contribution of male and female breeders to progeny in present artificial breeding has resulted ...
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Conservation of genetic diversity of juveniles used for restocking of natural populations requires serious attention in artificial breeding protocol of the Caspian brown trout Salmo trutta caspius. Unbalanced contribution of male and female breeders to progeny in present artificial breeding has resulted in the reduction of effective population size in breeders. Equalization of milt volume did not also result in balanced contribution of breeders. With regard to the possible effect of sperm concentration on contribution of breeders to production of progeny, effective population size in breeders and genetic diversity of progeny were determined in mixed milt fertilization of 6 male and 2 female breeders with equal sperm concentration and ova number. Parentage assignment was performed using exclusion method in FAP program by analyzing 9 microsatellite loci and choosing the 3 most polymorphic ones, Str 58, Str 73 and Str 591, in breeders. More than 91% of progeny were assigned to their parents. Effective population size was calculated as 5.24 (0.65) and the number of alleles and expected heterozygosity decreased in progeny (6.67 and 0.726 ± 0.011) compared to parents (7.33 and 0.808) significantly (P>0.05). In conclusion, equalization of sperm concentration of male breeders did not result in the balanced contribution of male breeders to ova fertilization and production of progeny in mixed milt fertilization of Caspian brown trout and genetic diversity of progeny remained significantly decreased.
Omidvar Farhadian; Mohammad Hossein Khanjani
Volume 10, Issue 3 , September 2012, , Pages 48-56
Abstract
Temperature and photoperiod are important parameters in zooplankton culture, particularly in cladoceran culture due to their significant effect on growth and reproduction. Effects of temperature and photoperiod on the growth and fecundity of a cladoceran, Moina macrocopa was examined by culturing and ...
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Temperature and photoperiod are important parameters in zooplankton culture, particularly in cladoceran culture due to their significant effect on growth and reproduction. Effects of temperature and photoperiod on the growth and fecundity of a cladoceran, Moina macrocopa was examined by culturing and feeding it with green algae Scenedesmus quadricauda in 500 ml conical flasks. Treatments used for temperature (0C)and photoperiod were 25, 30, 35 (0C) and 12:12, 24:0 and 0:24(light:dark hours), respectively. The maximum population density (310.5 individuals/flask), maximum specific growth rate (SGR) (0.387 individuals /day), shortest population doubling time (Dt) (1.79days) and highest fecundity (8.5 offsprings/ female) obtained at 30(0C). Correspondingly, the maximum population density (320.7 ind/flask), maximum SGR (0.538 ind/day), shortest Dt (1.28 days) and highest fecundity (7.54 offsprings/ female) determined at 24:0 light:dark photoperiod. Overall, this research showed that growth and reproduction of M. macrocopa at 30 (0C) and 24:0 light:dark photoperiod gave significant performance (P<0.05) compared to other examined treatments. Mass culture of this species under the mentioned conditions of temperature and photoperiod could provide suitable live food for use in fish larvaiculture.
Rouhollah Zare; Seyyed Mohammad Bagher Nabavi; Mahdieh Eftekhar Vaghefi
Volume 12, Issue 1 , April 2013, , Pages 49-56
Abstract
Nest site location in reptiles is an important stage of their life cycle because environmental factors influence embryo survivorship, incubation quality and sex ratio. For studying effective factors on nest site location in the hawksbill turtle, we measured temperature, moisture, beach slope, particle ...
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Nest site location in reptiles is an important stage of their life cycle because environmental factors influence embryo survivorship, incubation quality and sex ratio. For studying effective factors on nest site location in the hawksbill turtle, we measured temperature, moisture, beach slope, particle size of sand and vegetation related to 35 nests in Shidvar Island. In this Island, most nests were in northern beach which has a relatively steep slope. In this slope energy costs and probability of females and hatchlings predation is low. In addition hawksbills preferred to nest amongst vegetation. Of the environmental evaluated, slope appears to have the greatest influence on nest site location, because it is associated with nest elevation and hatching success is higher from nests closest to suitable elevation. It is believed that sea turtles may use multiple cues for nest site location and use a threshold that must be reached for each environmental factor before the turtle initiates nest excavation.
علوم زیستی دریا
Hassan Morovvati; Mahmood Khaksary Mahabady; Mehrzad Mesbah; Reza Fakoori
Abstract
At this study, kidneys of 10 normal fishes have been studied macroscopic and microscopically. The kidneys were collected by autopsy and tissue samples were sectioned by routine paraffin embedding and stained by H&E and PAS. Macroscopic observation showed that the kidney in Barbus grypus situated ...
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At this study, kidneys of 10 normal fishes have been studied macroscopic and microscopically. The kidneys were collected by autopsy and tissue samples were sectioned by routine paraffin embedding and stained by H&E and PAS. Macroscopic observation showed that the kidney in Barbus grypus situated in the ventral region of vertebral column. The kidney could be divided into; head, body and tail portions according to their relative position. Microscopic studies showed that the kidneys consisted of excretory portion and hematopoietic-lymphoid tissues. Anterior portion of kidney (head) had more Hematopoietic-lymphoid tissues than the posterior portion (body and tail). Hematopoietic-lymphoid tissue consisted of cells which were found in different stages of development to blood cells. Excretory portion of kidney parenchyma consisted of renal corpuscle and urinary tubules. In microscopic section of glomerulus, endothelial and mesangial cells and nucleated red blood cells were seen. The number of renal corpuscles in the posterior portion of kidney was more than the anterior portion significantly, while there was no significant difference between the average diameter of renal corpuscles in the head, body and tail portions of kidney. Urinary tubules consisted of neck segment, proximal tubule (first and second portion), intermediate segment and distal segment. The collecting ducts were situated after the distal segments. No significant difference was observed in the measured parameters between the males and females fishes in this study. Based on the results of this study, the kidney of Barbus grypus is very similar to other species of the family Cyprinidae, histologically and anatomically.
t s; a s; n s; b d; a d
Volume 12, Issue 4 , September 2014, , Pages 50-60
Abstract
This study was done to identify larval stages and biodiversity of Dendrobranchiata planktonic communites in artificial reefs of Khuzestan coasts(Bahrekan area in Northwest Persian gulf) for one year from May 2011 to April 2012 monthly basis.Sampling was conducted using a plankton net with a spring 300 ...
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This study was done to identify larval stages and biodiversity of Dendrobranchiata planktonic communites in artificial reefs of Khuzestan coasts(Bahrekan area in Northwest Persian gulf) for one year from May 2011 to April 2012 monthly basis.Sampling was conducted using a plankton net with a spring 300 micrometers. Totally, from two superfamily: Penaeoidea and Sergestoidea, 3 families: Sergestidae, Luciferidae, Penaeidae were identified.From Penaeidae family, Metapenaeus affinis ,Penaeus indicus and Parapenaeopsis stylifera species, from Luciferidae family, Lucifer hanseni specie and from Sergestidae family, Acetes sp specie were identified and introduced. Also larval density of identified species in different months and stations are calculated and determined Metapenaeus affinis specie(With the average of number per cubic meter in 1029±830 )from Penaeidae family account for larval density is maximum in September. Finally, two abundance peak was observed that the first peak was in September and the second peak was in November.The maximum of relative frequency percentage in Penaeoidea superfamily related to mysisI stage and 62 percentage. The results obtained indicate that the artificial structures are well managed nursery area for Penaeidae shrimp. The maximum average value of Shanon-wiener index was in November (1.36) due to the presence of all species in the same month. Simpson index was lowest in November, which confirms the above conclusion.
علوم انسانی دریا
Behzad Seyfi
Abstract
The seizure of ships in different maritime territories is one of the basic challenges of the international law of the seas, which leads to legal disputes between flag and coastal states and sometimes third states. On Tuesday, April 19, 2022, the Greek Coast Guard seized the Russian tanker Pegas/Lana, ...
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The seizure of ships in different maritime territories is one of the basic challenges of the international law of the seas, which leads to legal disputes between flag and coastal states and sometimes third states. On Tuesday, April 19, 2022, the Greek Coast Guard seized the Russian tanker Pegas/Lana, which was carrying an Iranian oil cargo, in the waters of the Greek island of Oia, due to the violation of US and European Union sanctions against Russia in connection with the attack on Ukraine, and the Iranian oil cargo at the request of American judicial authorities. This action was met with protest by the authorities of the Islamic Republic of Iran, and despite diplomatic efforts to resolve the disputes peacefully, two Greek oil tankers were seized by the Islamic Revolutionary Guard Corps with a court order and a complaint from the owner of the oil tanker Lana. Therefore, the purpose of this brief is to examine these seizures from the perspective of the international law of the seas, and to answer the question, whether the actions of Greece and Iran are legitimate or not from the perspective of the international law of the seas? The research method of this article is descriptive and analytical, and the method of collecting library information is documentary. The findings of the research indicate that the seizure of Iran's oil cargo by Greece and the United States is in contradiction with the peaceful use of the seas and freedom of navigation. Regarding Iran's actions, considering that according to the statements of the Greek Ministry of Foreign Affairs, the location of the seizure of these two oil tankers was in the monitoring zone and the territorial sea of Iran, the Islamic Republic of Iran has jurisdiction and according to the verdict issued by the judicial authorities due to maritime violations. He has seized Greek oil tankers.
Arash Shakouri; Seyed Mohamad Bagher Nabavi; Preeta Kochanian; Ahmad Savari; Alireza Safahiye
Volume 12, Issue 3 , September 2014, , Pages 51-62
Abstract
Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with ...
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Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with 100m2 area were sampled with SCUBA diving method in each region. Temperature had significant variation among the stations and seasons. There is a positive correlation (99%) between salinity and sea cucumber density and a negative correlation (95%) between turbidity and density. PCA indicated that salinity, pH, turbidity and temperature had 82.78% of all variance of the environmental factors and other factors did not exhibit such a relation with sea cucumber dispersion. Northern stations (Sepah and Kalantary) were located in same category in Fall 2007 and Winter 2008. These stations had the least pH and the highest salinity and turbidity in Fall and the highest pH and the least turbidity in Winter. Southern stations (Beheshti and Hotel Daryai) located in the same category in summer and fall 2007. These stations had the most pH and the least salinity in the summer and the most temperature and turbidity in the fall.
Abstract
Some growth parameters and feeding aspects of the Lizardfish, Saurida tumbil, in Iranian coastal waters of the Persian Gulf (Bushehr Province), were studied by regular monthly collections during February 2006- February 2007. Among a total of 691 specimens, 538 were females, 114 males and 39 immature. ...
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Some growth parameters and feeding aspects of the Lizardfish, Saurida tumbil, in Iranian coastal waters of the Persian Gulf (Bushehr Province), were studied by regular monthly collections during February 2006- February 2007. Among a total of 691 specimens, 538 were females, 114 males and 39 immature. The total length for females ranged from 26.1 to 58 (38.9±6.7) and for males from 25.5 to 53.5 (34.20±6.7) cm. The total weight of females ranged from 136-1550 (486.7±281.9) and for males from 116 to 1125 (332±225) g. The length-weight relationship for all fish was W= 0.0064L3.042 suggesting an isometric growth for all the fish sample. Condition factor ranged from 0.43 to 0.94 in different months. The relative length of the gut (RLG) was 0.44 on average, suggesting a carnivorous feeding habit of this fish. The maximum and the minimum gasterosomatic index (GI) (gut weight/total weight) occurred in November and in June, respectively. Amongst the 691 studied fish, 187 fish had empty, 297 semifull and 207 full stomachs. On the basis of stomachs contents, Clupeidae, Trichiuridae, Synodonthidae, Carangidae and shrimp were the most important food items, respectively. Based on the results of this study, it could be concluded that the lizard fish is a voracious piscivore species with a positive allometric growth pattern in juveniles and an isometric growth pattern in adults.
مهندسی دریا
Ahmad Hajivand; Hesamoddin Ravanbakhsh
Abstract
The extensive development and design of multihull ships began in the second half of the twentieth century. Nowadays, many of these ships are built with different designs. However, less numerical and experimental studies have been conducted on their behavior compared to single hull ships. The length and ...
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The extensive development and design of multihull ships began in the second half of the twentieth century. Nowadays, many of these ships are built with different designs. However, less numerical and experimental studies have been conducted on their behavior compared to single hull ships. The length and distance of the two hulls are the factors influencing the wave pattern created around and between the hulls and, consequently wavemaking resistance. In this study, the effect of geometric parameters including length to diameter ratio and body spacing on the hydrodynamic performance of a vessel with a small water plane area surface has been studied using computational fluid dynamics. To investigate the effect of L/D on the wave pattern around the body, towing test is simulated for two models with different ratios in a wide speed range. Furthermore, to evaluate the effect of two-hull distance on the interference of waves between two bodies, two models have been simulated at different distances at different speeds in the computational fluid dynamics environment. Simulations are performed for two different draft. The effect of Froude number, length to diameter ratio and draft on hydrodynamic behavior of the model has also been studied. The pressure, friction and interference resistance of the two bodies are calculated and the wave pattern surrounding the body and between the two bodies is extracted and compared with experimental data, which indicates the reasonable approximation of numerical and laboratory results.
Abdolali Movahedinia; Zahra Yarahmadi; Sara Rastgar
Volume 11, Issue 3 , November 2012, , Pages 52-62