Volume 3, Issue 3 , July 2013, , Pages 153-158
Abstract
The purpose of this project is the investigation of LHRHa2 integrated effect with carp pituitary extract (CPE) in three stages injection on sexual indexes (fecundity, fertilization, hatch and larval survival) in artificial propagation of Barbusxanthopterus. 20 fish were divided in to 4 treatment and ...
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The purpose of this project is the investigation of LHRHa2 integrated effect with carp pituitary extract (CPE) in three stages injection on sexual indexes (fecundity, fertilization, hatch and larval survival) in artificial propagation of Barbusxanthopterus. 20 fish were divided in to 4 treatment and injected interpritoneal as follows 4mgkg-1b.w.of CPE as positive control, 4 µg/kg +4 mgkg-1b.w. of LHRH-A 2 +CPE, 7 µg/kg-1b.w. + 4mgkg-1b.w. of LHRH-A 2 + CPE , 10 µg/kg-1b.w. + 4mg kg-1b.w. of LHRH-A 2 +CPE. Results showed that the broodstocks of control treatment were answered no positive to injecting 4 mg/lit pituitary extract and second treatment (7 µgLHRHa2 + 4 mg CPE) showed highest weight of extracted egg ,spawning success, fertilization success, hatching rate and larvae survival, in comparison with other groups. None of fish were ovulated in the group of positive control. Therefore, this dose and injection method can be introduced as the most successful and practical method for artificial propagation ofBarbusxanthopterus.
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.
L. Mohajeri; H. A. Aziz; M. H. Isa; M. A. Zahed; S. Mohajeri
Volume 3, Issue 2 , June 2013, , Pages 99-104
Abstract
Bioremediation, the process by which microorganisms degrade organic compounds to non-toxic or less toxic substances, has been widely used for cleanup of coastal ecosystems after oil spills. In this study, the hydrocarbon degradation rate and half lives in three bioremediation strategies (natural attenuation, ...
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Bioremediation, the process by which microorganisms degrade organic compounds to non-toxic or less toxic substances, has been widely used for cleanup of coastal ecosystems after oil spills. In this study, the hydrocarbon degradation rate and half lives in three bioremediation strategies (natural attenuation, biostimulation, and bioaugmentation) were compared in weathered crude oil (WCO) contaminated sediment samples. Three initial WCO concentrations of 3, 30 and 60 g WCO per kg sediment were investigated. Kinetic evaluations were carried out in a 90-day laboratory scale experiment. All oiled sediments showed decreasing WCO concentrations over time. After two weeks, the rate of degradation in the natural attenuation experiments stayed approximately constant. Bioaugmentation demonstrated higher oil removal than biostimulation or natural attenuation. The results indicated that first order kinetics can describe bioremediation of crude oil in sediments. The values of R2 (coefficient of determination) varied from 0.9552 to 0.9965. The first order kinetic constant for the reactors at different WCO concentrations was between 0.0014 and 0.0159/day. The half life of WCO in sediment reactors was different for each applied method. The minimum WCO half life for natural attenuation, biostimulation and bioaugmentation was 408, 69 and 44 days respectively.
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.
Volume 3, Issue 3 , July 2013, , Pages 159-168
Abstract
In this paper effect of pile-soil consideration in obtaining seismic response offshore structure is assessed due to earthquake loading. InducedSeismic force is one of the most important excitations for the dynamic response of an offshore structure. According to API, Seismic forces should be accounted ...
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In this paper effect of pile-soil consideration in obtaining seismic response offshore structure is assessed due to earthquake loading. InducedSeismic force is one of the most important excitations for the dynamic response of an offshore structure. According to API, Seismic forces should be accounted in platform design for seismically active regions in order to determine the allowable seismic risk for the type of operation intended. Two model were developed, in the first one, pile-soil interaction was neglected whereas in the second one, pile-soil interaction was considered by using un-grouted pile stubs. The models that were used in this research were consist of two dimensional finite element models with linear behavior. After obtaining dynamic specification of structural system, a linear time history analysis was performed on both models and eventually the response of structure in the form of overall drift and maximum top displacement was compered. Finally it was shown that neglecting consideration of pile soil interaction will not always result in ensuring structural responses.
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.
Seyed Reza Samaei; Mohammad Asadian Ghahferokhi; Farhood Azarsinai
Volume 6, Issue 1 , January 2022, , Pages 8-16
Abstract
Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce ...
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Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce the unforeseen costs in project implementation. In this study, using geometric similarity methods and Froude dimensionless numbers, two floating pontoon breakwater has been built in workshop and were affected by the three waves with different technical specifications. Furthermore, for a more extensive review of the breakwater performance, tests in three different drafts has been executed on them. Then transfer coefficients for different mentioned conditions have been evaluated and calculated and its relations with the draft and the waves were obtained. Finally, after analyzing and comparing the obtained transmission coefficients, the best breakwater in terms of performance in the developed laboratory conditions will be introduced.
Satyendra Nath Chakrabartty
Volume 6, Issue 1 , January 2022, , Pages 17-24
Abstract
Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce ...
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Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce the unforeseen costs in project implementation. In this study, using geometric similarity methods and Froude dimensionless numbers, two floating pontoon breakwater has been built in workshop and were affected by the three waves with different technical specifications. Furthermore, for a more extensive review of the breakwater performance, tests in three different drafts has been executed on them. Then transfer coefficients for different mentioned conditions have been evaluated and calculated and its relations with the draft and the waves were obtained. Finally, after analyzing and comparing the obtained transmission coefficients, the best breakwater in terms of performance in the developed laboratory conditions will be introduced.
Mehdi Hosseininasab; Mohammad Kasaeyan
Volume 6, Issue 1 , January 2022, , Pages 25-35
Abstract
LNG (Liquefied Natural Gas) has matured rapidly as a clean fuel in the global energy market. SSLNG (Small Scale LNG) is a new method for more convenient transferring LNG from production plants to the end users. the challenge related to the SSLNG business is a relatively expensive supply chain due to ...
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LNG (Liquefied Natural Gas) has matured rapidly as a clean fuel in the global energy market. SSLNG (Small Scale LNG) is a new method for more convenient transferring LNG from production plants to the end users. the challenge related to the SSLNG business is a relatively expensive supply chain due to the absence of economies of scale. In this Study, a novel method for LNG transportation in the supply chain has been presented. the main idea of this method is to use the mobile LNG containers for exportation & importation in order to improve and facilitate the process of transportation of LNG in economical way, such as elimination of regasification units in the course of loading/offloading of LNG. Also in this paper, suitable materials for cryogenic fluid is invested and the proper size of conceptual model of mobile containers with consideration of being practical and easy handling are proposed.The multi layers arrangement for the suggested containers are Invar, Polyurethane foam and Polyamide and etc. The container sizing also has been selected equal to ISO (International Standard Organization) 40 ft size containers. A conceptual model using finite element method (FEM) for the suggested container has been created. An analysis using ABAQUS CAE 2016 Software has been applied to investigate on the conceptual container strength under periodic loads during charging and discharging containers with LNG.
Constantine Stamatopoulos
Volume 6, Issue 1 , January 2022, , Pages 36-54
Abstract
The study presents practical approaches for determining appropriate, or “safe,” sample sizes for routinely conducted statistical surveys. Finite populations are considered holistically and independently of whether they are continuous, categorical, or dichotomous. It is proposed that in sampling ...
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The study presents practical approaches for determining appropriate, or “safe,” sample sizes for routinely conducted statistical surveys. Finite populations are considered holistically and independently of whether they are continuous, categorical, or dichotomous. It is proposed that in sampling surveys variance-ordered categories of populations should be the basis for calculating the safe sample size given that the variance within a target population is a primary factor in determining sample size a priori. Several justifications are presented for this thesis. Dichotomous populations are often assumed to have higher variances than continuous populations when the latter have been standardized and have all values in the interval [0 1]. Herein, it is shown that this is not a valid assumption; a significant proportion of dichotomous populations have lower variances than continuous populations. Conversely, many continuous populations have variances that exceed the limits that are broadly assumed in literature for determining a safe sample size. A simple first step is to partition finite populations into just two categories: convex and concave. These two categories are relative to a flat population with a known variance as the threshold between them. This variance is used to determine a safe sample size for any continuous population with a flat or positive curvature, including approximately 20% of dichotomous populations. For all other populations the variance of 0.25 is recommended for sample size determination. The suggested approaches have been successfully implemented in fisheries statistical monitoring programmes but it is believed that they are equally applicable to other applications sectors.
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.