جستجوی مقالات مرتبط با کلیدواژه "liza aurata" در نشریات گروه "علوم پایه"

Golden gray mullet, Liza aurata is one of the most valuable and sensitive species in the Caspian Sea. Given the possibility of catching Caspian bony fish only in the second six months of each year, the present study was conducted from autumn to winter 2015 in the Caspian Sea and Gorgan Bay to investigate the effect of season and habitat on hematological and biochemical analysis of golden mullet fish serum. 30 golden mullet fish that were caught in both seasons randomly from the Caspian Sea and Gorgan Bay with a blade net were studied. The blood study was divided into two sections: blood serum studies (liver enzymes, cortisol, glucose and protein) and hematological indices (blood and differential cells). The results of enzymatic indices showed that all indices had the highest amount in the autumn seasons and the lowest in the winter, indicating a greater influence of the season on sampling location. The results of hematological, immunological and biochemical indices showed that these indices did not follow the same trend and did not adhere to a single characteristic and each index showed different responses under different environmental conditions and seasons. Overall, the results of this study confirm that the blood and serum parameters of mullet fish in different environmental and time conditions have different responses and among these parameters, the enzymatic parameters showed significant trend and could be suitable biomarkers.

The cesium-137 (Cs-137) is one of the most dangerous fission fragments from fissionable nuclides U-235, which it half-life is about 30/17 years. The Chernobyl accident was diffused a high concentration of radioactive pollutants especially Cs-137 in different areas. Since Iran is very close to accident area, it is necessary to study the contamination of radioactive material in the environment and living organisms. The research covers the health of muscle tissue of liza aurata to pollution of Cs-137 of center region in southern part of the Caspian sea in 2008. In this study 60 piece of liza aurata were obtained from fishing sites in Mazandaran province (in the central region of the southern coasts of the Caspian Sea). The Cs-137 activity measurement of muscle tissue was carried out by using of gamma spectrometry. The results of Cs-137 was compared by the International Atomic Energy Agency (IAEA) and the World Health Organization (WHO) at 10 Bk/Kg. Based on the results, Cesium-137 levels in muscle tissue were less than the detection limit in more than 90% of the fish samples. The radioactive material was within the permissible and standard range in the rest of the fishes (8.3%). This study has been confirmed the health of muscle tissue of Liza aurata muscle to pollution of radioactive Cs-137 in period and area of stud

The aim of this study was to investigate and identify profile compounds of amino acid of male and female golden grey mullet (Liza aurata) in both reproductive and non-reproductive periods. In doing so, 100 pieces of golden grey mullet were caught in two seasons: spring (non-productive) and autumn (reproduction) on the southern coast of the Caspian Sea. After biometry of the samples, protein measurement was performed using standard Kjeldahl method and amino acid analysis by HPLC. Based on the results, male fish had higher protein content than female fish. In addition, in the non-reproductive period, the fish had more protein compared to reproductive period (p<0.05). There were no significant differences in essential and non-essential amino acids in male and female fish (p>0.05), so gender has no effect on the content of amino acids. Lysine had the highest total amount of essential amino acids and glutamic acid in the total amount of unnecessary amino acids in both sexes and in both reproductive periods. There was a significant difference between the sum of essential and non-essential amino acids and protein efficiency in two reproductive periods (p>0.05). TEAA/TNEAA ratio of fish in the reproductive period was 0.99 and in the non-productive period was 1. In addition, leucine/isulosin ratio in golden grey mullet was good. Therefore, golden grey mullet fish are rich in the most important amino acids in marine aquatic animals and its meat is of high quality.

Heavy metal pollution of water is one of the most serious environmental problems in the world and the Caspian Sea, the largest lake in the world, is exposed to high levels of industrial, agricultural and oil pollutants. Fish species are the ultimate consumer in the food pyramid in aquatic ecosystems. Since the fish form a large part of the human diet, heavy metals enter the human body through contaminated fish. This study was conducted to measure the concentration of five heavy metals, including lead, cadmium, mercury, arsenic, and chrome in the edible tissues (muscle) and non-edible tissue (liver and gill) of the gray mullet, Liza aurata and its seasons and living environment in the southern coast of the Caspian Sea. and also to compare their amounts with World Health Organization, Australian National Health and Medical Research Council, Food and Drug Administration standards. A total of 100 adult golden gray mullet were caught from 10 sites (Including Astara, Talesh, Anzali, Rudsar, Tonekabon, Nowshahr, Fereydunkenar, Behshahr, Bandar-e Torkaman and Hojanepes) in various coastal areas near inflows of urban, agricultural and industrial waste water and along the waterfront and fishing areas. After biometry, metals were extracted from the tissue using a mixture of acid digestion and determination was conducted by graphite furnace atomic absorption system. The results showed that the metal accumulation in tissue was different and significant, the concentration of the metals in the three tissues was as follows: liver>gill>muscle. Heavy metals choose their target organ based on its metabolic activity and this explains the reason why more metals accumulate in tissues such as the liver and gills compared to muscle tissue (with low metabolic activity). Liver tissue tends to be high in accumulation of heavy metals. The high concentration of metals in the context of the gills, is the first sign of contamination in the water. Mixing elements with gill mucus, full transposition of the lamella gill elements when preparing tissue for testing impossible to screw???. Metal concentrations in muscle are lower than those in liver because muscle is not the first storage place for these metals; heavy metals are first stored in the liver and then transferred to the muscle. Metal accumulation was as Pb> Cd> Cr> Hg> As. The study of heavy metals between stations, in muscle tissue was significantly different. This may be due to differences in pollutant sources in sampling areas. The accumulation of heavy metals increases from the southwest to the southeast coast. According to the Pearson test, there was the significant negative linear relationship between the Pb, Cd and As accumulation tissues by weight. Except for arsenic, there was no significant correlation between the metals with any total length. Moreover, there was a positive relationship (p<0.01) between the Pb, cd, Hg and As concentrations, with the exception of Cr. comparison of the data obtained for muscle tissue with the global standard level (WHO /NHMRC) showed that the concentration of the heavy metals Pb, Cr, Cd, Hg was higher than the global standard level, except for As. The least metal absorption and accumulation is in the muscle of mullet that is a source of human nutrition, followed by aquatic to the above elements. Since the concentration of the heavy metals tested above was higher than the global standard, this reflects the increasing water pollution of the Caspian Sea

The present study aimed to survey heavy and toxic metal pollution (lead and cadmium) in the southern Caspian Sea basin through Liza aurata</em> using geographic information system (GIS).  Samples of the gill tissue of adult Liza aurata</em> were taken in 10 stations over the southern coast of the Caspian Sea in spring and fall. Interpolation method, Kennedy density function, Moran test, and Gi* index in the GIS were used to determine the spatial distribution, density, zoning and distribution pattern of the metals. The uptake of lead and cadmium was 1.88 and 1.23 µg/g in spring, and 1.42 and 0.79 µg/g in fall, respectively. Analysis of GIS maps showed that concentration and centralization of both metals reduced from East to West. According to Moran test and Gi* index, the distribution of the metals had a strong and hot cluster pattern that reveals the accumulation and closeness of high-density polluted areas. Finally, it can be stated that the pollution of the eastern part of the Caspian Sea (Bandar Turkman and Khajeh-nafs) is higher than permissible international standard limits.

Genetic structure of golden mullet, Liza aurata, investigated in the Gomishan and Anzali wetlands using six microsatellite primer sets (Muce55, Muce37, Muso10, Muco16, Muso19, and Muso22). Totally 60 samples of adult golden mullet were collected from these regions. All primer sets as polymorphic loci were used to analyze the genetic variation. Analyses revealed that average of alleles (Na) per locus was 5.3 (range 3 to 9 alleles) and in regions, samples of Gomishan wetland 5.1 and Anzali wetland 5.5 respectively. All sampled regions contained private alleles. The average estimates of inbreeding coefficients (Fis and Fit) values of 6 microsatellites were positive. The average observed and expected heterozygosity was in Gomishan wetland 0.153 and 0.721 and Anzali wetland 0.328 and 0.747 respectively. Deviations from Hardy-Weinberg equilibrium were in all cases (P

Golden mullet is very important species and edible in Caspian sea areaDue to no microscopic study on the gill tissue in this species the recent research has been doneFor this purpose, 20, of fish after biometry were used.In this research fish collected for histological studies of the second gill arch on the left, then convert into smaller piece fixed in Bouin 's solution and incubated for 48 hAfter routine histological procedures,sectionsat 5 to 6 micronsthickness stained using (H&E), (PAS) and cover slip was done. In immunohistochemical studies, paraffin slides after the initial stages of preparation such as removal and discharge of ethanol in phosphate buffer saline solution and then rinsed in phosphate buffer saline solution that combines, of NaCl and Tween. In gill microscopic examination each blade as a thin layer of cells layed on the basement membrane and two side of the them were protected with Pilar cells. Flat membranes of the respiratory lamellae that are formed in large numbers mucous secreting cells. The other main cells in the chloride cells and surrounded by flat lining cells were higher at the junction between the lamellae and filaments. Immunohistochemical studies showed that the cells were exposed to a large number of filament epithelium and rarely in the epithelium of lamella.Recent study on gill epithelial cells of this species showed some similarities and differences with other species that have been addressed.

Heavy metal pollution can have devastating effects on the ecological balance of the recipient environment and a diversity of aquatic organisms. Among animal species, fishes are the inhabitants that cannot escape from the harmful effects of these contaminants. In the present research, during spring 2014, twenty-nine specimens of Liza aurata were collected from Bandar Anzali coast in Gilan province. The aim of this study was to provide information on heavy metal (Cd and Pb) concentrations in the muscles of this fish species and to evaluate the possible risk associated with their consumption. The levels of heavy metals were measured by GFAAS after digestion of the samples using concentrated acids. The results of this study showed that the average concentrations of cadmium and lead in muscle were 0.67 and 0.072 µg/g, respectively. The concentration of two metals in the present research were lower than the limits permitted by FAO, WHO, MAFF and NHMRC. The estimated daily intakes (EDI) of two metals through consumption of the Liza aurata fish by native people in the Bandar Anzali coast were well below the permissible tolerable daily intake for 70 kg person (PTDI70) set by EPA. Therefore, it can be concluded that no problems on human health would be raised at present from the consumption of Liza aurata fish from the Bandar Anzali coasts.

The pollution of aquatic ecosystems with heavy metals has always been a major concern for the aquatic organisms and human health. Measuring the levels of contaminants such as heavy metal (Pb) accumulated along the food chain (fish) and then transmitted to the human body is of particular interest. Concentrations of heavy metal (Pb) were measured in the water, sediment and fish species (Liza aurata) from the Gomishan Wetland, Iran. Samples of water, sediment and fish were collected during two periods: summer (2013) and winter (2014). The result revealed thatPb concentration was varied significantly among sediment, water and fish body, the average Pb concentrations in sediment, water and fish in both seasons was in the order sediment > fish >water, Pb concentration was varied significantly among gills, liver and muscle tissues of fish samples in any station and in both seasons was in the order gill > muscle >liver. These values were lower than the established standard for aquatic environment by W.H.O and F.A.O. The results indicated that the consumer of fish and water from the stream is not at risk of being poison by this metal.

This study was carried out to evaluate some quality aspects such as lipid deterioration on Vacuum Packed (VP) brined golden mullet Liza aurata during 90 days of storage at 4ºC. Peroxide Value (PV) and thiobarbituric acid (TBA) were analysed to determine lipid deterioration at intervals of 0, 30, 60 and 90 days.The data was analyzed by Tukey test and ANOVA. Increasing in PV and TBA were found to be statistically significant in the VP brined golden mullet through out storage (P<0.05). This study showed that lipid deterioration can be considered as one of the chemical assessment to determine the shelf life of VP brined golden mullet during storage.Based on data the best shelf life was found 30 days for VP brined golden mullet stored at 4ºC.