علوم زیستی دریا
Jasem Ghafleh Marammazi; Mojtaba Zabayeh Najafabadi; Esmaeil Pagheh; M Hafezieh
Abstract
This study has been carried out to evaluate the effect of varying dietary levels of protein (45%, 50%, 55% and 60%) and energy (20, 22 and 24 kjg-1) on growth, survival rate, food performance and body chemical composition of sobaity Juvenile. 36 polyethylene of 300 Lit volume container equipped with ...
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This study has been carried out to evaluate the effect of varying dietary levels of protein (45%, 50%, 55% and 60%) and energy (20, 22 and 24 kjg-1) on growth, survival rate, food performance and body chemical composition of sobaity Juvenile. 36 polyethylene of 300 Lit volume container equipped with flow-through water system (with 1 Lit/min water exchange) have been provided and each stocked with 18 Juvenile fishes (27.99 ± 0.14 g weight). During the rearing period biometric measurement was carried out once fortnightly. After 56 days of rearing period, results showed significant affect of treatments and varying levels of protein and energy on the growth and food performance, survival rate and body composition )P ≤ 0.05) of the fish, but the effect of dietary protein was not significant on the FCR, PER, fat and body crude fiber (P > 0.05). Also the effect of dietary energy was not significantly effective (P> 0.05 ) on the growth and food performances, but was significantly effective on the survival rate and body composition )P ≤ 0.05) of the fish. Results also showed the highest growth of fish in diet with 60% CP and 24 kJg-1 energy, highest survival rate in diet with 55% CP and 22kJg-1 energy and best FCR and PER in diet with 50% CP and 24 kJg-1 energy. According to the results of the present, 50% CP and 22 kJg-1 energy are recommendable to cover the dietary protein and energy requirement of sobaity fish in the Juvenile stage.
علوم زیستی دریا
Fereshteh Salimian; Mehrdad Fattollahi; Amin Nematollahi; Farzaneh Nikookhah; Navaz Kharazian
Abstract
In the present study, the efficiency of the total flavonoids and aqueous extracts of M. communis L. tree leaves, as a recognized medicinal plant of Iran flora were assessed in vitro on the growth of the isolated fungi, Saprolegnia and Fusarrium using the agar disc and well diffusion methods in flat-bottom ...
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In the present study, the efficiency of the total flavonoids and aqueous extracts of M. communis L. tree leaves, as a recognized medicinal plant of Iran flora were assessed in vitro on the growth of the isolated fungi, Saprolegnia and Fusarrium using the agar disc and well diffusion methods in flat-bottom microplates in presence of the various extract concentrations. The isolated fungi were sampled from the fertilized eggs of rainbow trout fish incubation farms. The collected leaves from the natural habitats of Chaharmahal-o-Bakhtiary province at early-summer were extracted by maceration methods with water solvent as well by flavonoids extraction methods with methanol solvent. During the succeeding trials, the antifungal effects of the flavonoids extracts (by the well diffusion method) and the aqueous extract (by the well diffusion method) against isolated Saprolegnia were revealed by MFC (Minimum Fatal Concentration) values 50 and 100 mg/ml, respectively. The only effect of the methanolic and aqueous extracts of M. communis leaves revealed in vitro inhibiting effect on growth of isolated Fusarium by MIC values 25 and 12.5 mg/ml, in disc diffusion and well diffusion method, respectively. The antifungal obtained effects by the extracts had more effective aspects on isolated Saprolegnia in comparison to Fusarium. The results of the study indicate that M. communis could be considered as a potential candidate for designing effective antifungal suitable for treatment of the fish eggs fungal infections.
مهندسی دریا
ahmad rezaie mazyak; mehdi sanayei
Abstract
The main goal of using floating breakwaters is to provide the sheltered area of calm water in the coastal zone. In present research, for analyzing hydrodynamic modeling of pontoon floating breakwaters the AQWA module of ANSYS software has been selected. The main parameters that have been considered in ...
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The main goal of using floating breakwaters is to provide the sheltered area of calm water in the coastal zone. In present research, for analyzing hydrodynamic modeling of pontoon floating breakwaters the AQWA module of ANSYS software has been selected. The main parameters that have been considered in this research are pattern of significant wave height, wave period, and draft and width of floating pontoon. Wave transmission coefficient can be obtained from water surface changes in any point of leeward. Results of numerical modeling demonstrate that a pontoon floating breakwater with relative width greater than 0.4 have appropriate performance. Also it has been found that the transmission coefficient of pontoon floating breakwaters will be in the range of 0.35 to 0.60 if the relative wave period changes in the range of 1.5 to 4.
علوم زیستی دریا
matin khaleghi; Alireza Safahieh; Ahmad Savari; Babak Doustshenas; Fereidoon Owfi
Abstract
This study touches on abundance and distribution of brittle star Macrophiothrix cheneyi in the intertidal zones of Chabahar Bay in the Oman Sea, Iran, due to spatial and temporal variobility during a year from November on 2008 to September on 2009 at 5 selected stations. Sampling was randomly done bimonthly, ...
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This study touches on abundance and distribution of brittle star Macrophiothrix cheneyi in the intertidal zones of Chabahar Bay in the Oman Sea, Iran, due to spatial and temporal variobility during a year from November on 2008 to September on 2009 at 5 selected stations. Sampling was randomly done bimonthly, by using 1m×1m qudrate. The result of study showed density of species in different stations and months has significant difference (P
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
G Mohammadi; M Mesbah; Gh Khadjeh; A Mombeini
Abstract
The aim of this study was evaluation of effects of total protein and cholesterol on physical and biochemical factors of cultural common carp milt in Khouzestan province. For this study 40 fish have been bought (20 in March and 20 in April) and examinations of physical and biochemical were tested. Base ...
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The aim of this study was evaluation of effects of total protein and cholesterol on physical and biochemical factors of cultural common carp milt in Khouzestan province. For this study 40 fish have been bought (20 in March and 20 in April) and examinations of physical and biochemical were tested. Base on the results, The total protein and cholesterol in April compared to March increased nonsignificantly. The ions of calcium, chloride, sodium and potassium in April compared to March increased. Based on the results there was significant and positive correlation between total protein and Albumin, cholesterol and K in march and significant and negative correlation with Cl but total protein in April had significant and positive with Cl, P, spermatocrit, cholesterol and Albumin and negative and significant correlation with weight of fish. Cholesterol in March had significant and positive with albumin and negative significant correlation with Cl and P but cholesterol in April had positive significant correlation with spermatocrit, Albumin, P and Cl. According to the data of this study, total protein, cholesterol, calcium, chloride, sodium, potassium of the Common carp seminal plasma increased in April compared to March. So because of these factors have effects on fertility, quality and quantity of common carp sperm So it is possible to adjust the parameters of protein, cholesterol and minerals of dietary in spawing season increase the quality of common carp sperm.
علوم زیستی دریا
Asad Asadi Eidivand; Seyed Mohammad Mousavi; Seyed Reza Fatemi Tabatabaei; Mohammad Zakeri; Nasim Zanguee
Abstract
This research was conducted for studying of biological parameters of Tenualosa ilisha on spawning and post spawning time. For this reason, 60 fish were captured through three months, on September- fresh water (Karoon river in Khorramshahr) (1st station), September- marine water (Hendijan coasts) (2nd ...
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This research was conducted for studying of biological parameters of Tenualosa ilisha on spawning and post spawning time. For this reason, 60 fish were captured through three months, on September- fresh water (Karoon river in Khorramshahr) (1st station), September- marine water (Hendijan coasts) (2nd station), October-marine water (3rd station) and November-marine water (4th station). Biological parameters, GSI and gonad histological study was performed. The results showed the highest total length, total weight and gonad weight were seen in fish were captured from 1st station which has a significant different with other fishes (p
علوم زیستی دریا
nemat mahmoudi; mohamadreza ahmadi; manoocher babanezhad; Jafar Seyfabadi
Abstract
Seasonal distribution of phytoplankton and factors affecting their presence in the Mazandaran coastal ecosystems were investigated in 2012. In this study, Distribution of the phylum and dominant species of phytoplankton and water quality parameters were evaluated along 4 transects (Amirabad, Babolsar, ...
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Seasonal distribution of phytoplankton and factors affecting their presence in the Mazandaran coastal ecosystems were investigated in 2012. In this study, Distribution of the phylum and dominant species of phytoplankton and water quality parameters were evaluated along 4 transects (Amirabad, Babolsar, Noshahr and Ramsar) in the different layers of the water column at final depths of 5, 10, 20 and 50m. Variation of the dominant species and environmental parameters was analyzed using Principal Components Analysis (PCA). Average annual phytoplankton density was 185162558 cubic meters, the highest density in winter and lowest in spring was determined. Totally, 7 groups and 131 species of phytoplankton were identified, including Bacillariophyta (58 species), Cyanophyta (24), Pyrrophyta (22), Chlorophyta (17), Euglenophyta (8) and 1 species each of Haptophyta and Xanthophyta. The dominant species in the water body were Exuviaella cordata of the Pyrrophyta (61.25% of the species) in spring, Oscillatoria sp. of the Cyanophyta in summer and autumn (48.69 and 71.91%, respectively) and Pseudo-nitzschia seriata of the Bacillariophyta (66.12%) in winter. This study showed that Thermocline, riverine transport, Mnemiopsis leidyi and opportunistic phytoplanktonic species with high competitive ability (Cyanophyta and Pyrrophyta (were the most effective factors on spatio-temporal variations of phytoplankton. Temperature, silica and inorganic nitrogen play an important role in population dynamics are diatoms, while temperature, inorganic and organic phosphorus and inorganic nitrogen for Cyanophyta and Pyrrophyta are important.
علوم زیستی دریا
negin derakhshesh; Abdolali Movahedinia; n s; m h; v b
Abstract
Liver is one of the most important organs in vertebrates that have important roles in detoxifying. The main purpose of the present study was developing appropriate methodology for the primary cultivation of hepatic cells from orange-spotted Grouper, Epinephelus coioides. In present study, hepatocytes ...
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Liver is one of the most important organs in vertebrates that have important roles in detoxifying. The main purpose of the present study was developing appropriate methodology for the primary cultivation of hepatic cells from orange-spotted Grouper, Epinephelus coioides. In present study, hepatocytes were isolated from five grouper individuals. Initially, the fish wiped with 70% ethanol. Liver were removed and cut into small pieces with scissors and hepatocytes were disconnected using different enzymatic digestion with collagenase (Type 1 and 4) and trypsin and additional nutrient materials in culturing mediums. Then, cells were cultured for 2 weeks in Lebowitz L-15 under 3 methods: 1. Using enzymatic digestion by trypsin, 2. Using enzymatic digestion by collagenase (type 1 and 4) and 3. Using nutrients and additives was cultured. Finally, effects of different incubation temperature (20, 25, 28, 30 and 32 degree of Celsius) and Bovine serum content (0, 10 and 20% and 20%+ITS) on cell growth were estimated. According to the results, digestion by collagenase type 4, resulted in more cell colonization and growth in comparison with other methods.In conclusion, the best culture method for primary hepatocyte from orange-spotted Grouper, Epinephelus coioides., was using ITS+20%FBS under 30 degree of Celsius incubation temprature.
مهندسی دریا
hossein bahrami; Mehdi ghomeshi; Seyed Mahmoud kashefi por; Seyed Ali Akbar Salehi Neyshabouri
Abstract
Density current is one of the relative motions that occur between two fluid layers, even in fluids with small difference in density. Differences in specific mass may cause of temperature, suspended material, solved material or a combination of them. These currents are so important specially in cases ...
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Density current is one of the relative motions that occur between two fluid layers, even in fluids with small difference in density. Differences in specific mass may cause of temperature, suspended material, solved material or a combination of them. These currents are so important specially in cases such as water containing sediment entering rivers into dam reservoir, seas or lakes and can also have destructive effects such as sedimentation in reservoir and estuaries to the sea and coastal areas as well as changing bedding sets Offshore areas (Kostic & Parker, 2005). The identification of type of move and change in current regime on the characteristics of the flow movement is very important. Investigation of flow movement, require to recognition of velocity profiles. A physical modeling used for this proposes and measurement and investigation of velocity on the body of current carried out. The results showed that the Coefficients of velocity profiles in wall and jet regions were respectively 2.83, 0.87 and 2.08 for sub critical flow and 1.174, 1.062 and 2.09 for super critical flow, also the maximum height of the supercritical flow was lower than sub critical flows. The other results showed that the velocity reduced 14 to 19 percent and the flow depth increased 21 to 32 percent affected by hydraulic jump respectively. Also, in some cases, large differences were observed between the results of the analytical jump relationship and measured data.
مهندسی دریا
Mohammad Khedmati; Mahdi Omidali; Roohollah Hadipoor Goodarzi
Abstract
A common way to join dissimilar materials in industrial applications is to use adhesives. Marine industries use this kind of joints for attaching main hull to superstructure of the ships. Most previous researches have focused on composite-composite joints, while a few of them are devoted to aluminum- ...
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A common way to join dissimilar materials in industrial applications is to use adhesives. Marine industries use this kind of joints for attaching main hull to superstructure of the ships. Most previous researches have focused on composite-composite joints, while a few of them are devoted to aluminum- sandwich panel joints. This study focuses on the numerical static strength analysis of a typical aluminum-sandwich panel T-joints and improving its strength through a novel design. The results of numerical analyses are in a good agreement with those of the experimental tests and confirm the accuracy of numerical analyses. In analyzing the adhesive between joint elements, contact elements and cohesive zone model (CZM) in ANSYS as well as nonlinear analysis is used. Results show that change in joint geometry considered in this paper, caused a 7.25% increase in vertical failure load of the joint. This increase in strength of joint attained in a situation that because of the merging of the joined parts, the process of construction became easier.
علوم غیرزیستی دریا
m s; a d; a a
Abstract
In the first step of developing of this software, we gathered some climate data which was collected during 20 years from the Persian Gulf. In the next step, climate data and boundary conditions were employed on a three dimensional hydrodynamic model (COHERENCE) to get physical properties of Persian Gulf. ...
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In the first step of developing of this software, we gathered some climate data which was collected during 20 years from the Persian Gulf. In the next step, climate data and boundary conditions were employed on a three dimensional hydrodynamic model (COHERENCE) to get physical properties of Persian Gulf. As a result we obtained a comprehensive density database from this model. Final produced software is able to calculate buoyancy force in specific time and location by its large database. The result of software show that the minimum seasonal average of draft occurs in the winter and the maximum one occurs in the summer. According to our expectancy, it has an inverse relation with density variation.According to our expectancy, it has an inverse relation with density variation