جستجوی مقالات مرتبط با کلیدواژه "esox lucius" در نشریات گروه "مهندسی دریا"

Anzali Lagoon is an internationally protected lagoon located in west-south of Caspian Sea which has special ecologic, economic, social importance with vast diversity of plants and animals. According to entrance of contaminants into this lagoon, concentration of several heavy metals in muscle of Esox lucius fish have been investigated in this study. First stage of sampling from three stations of lagoon, have been fulfilled at dry season of September and second stage have been implemented at rainy season of November 2010. In each season nine samples of fish have been collected and transported to laboratory in freezed condition. Evaluation and measurement of heavy metal concentration has been fulfilled by Graphite furnace atomic absorption equipment. Maximum mean concentration of Hg, Ni, Se, Zn, Al, and Fe have been detected in the summer and maximum mean concentration of Cu has been detected in the winter. Maximum mean value of Hg, Ni, Zn,Al in Abkenar, maximum mean value of Se in Siah Darvishan and maximum mean value of Cu, Fe in Komeh Aghajani have been detected, while concentraton of Mo, Cd, V and Pb are equal in the three above mentioned stations. Statistical analysis of this study has been fulfilled by SPSS, V14 software. Pearson correlation test, showed a positive strong correlation between temperature and the amount of Fe (r=0.83, P<0.05). Only significant difference in concentration of Fe has been obtained between summer and winter seasons (P=0.016, df=16, P<0.05). Significant difference in concentration was detected only for Hg between Abkenar and Komeh Aghajani stations (P=0.05).This study shown that, the concentration of Ni, Hg, and Cd in the muscle of Esox lucius are high and it is considered as a serious warning.

Concentrations of PAH’s known as carcinogenic compositions were studied in the muscle of Pike fishes (Esox lucius) in Iranian international wetland of Anzali in year 2010. Fifteen samples were taken at three stations of Mahruzeh, Koumeh Aghajani and Siah darvishan in dry (early September) and wet (early December) seasons. Some environmental parameters like pH, dissolved oxygen and water temperature were also measured at the same time. Biometry and age determination were done for each sample prior to their preparation for measurement of PAH’s concentrations using HPLC method. Acenaphtene with the concentration of (31.9 ± 11.37 ppb) and Benzo[a]pyrene with (0.2 ± 0.1 ppb) were the highest and lowest recorded concentrations in each season respectively. In both seasons, significant negative correlations (P<0.05) were observed between Naphthalene and Acenaphtene with fish age (2 year and under 1 year) and also between Benzo[b]fluoranthene and Benzo[ghi]perylene with dissolved oxygen. In both seasons, significant correlation were observed between dissolved oxygen and pH with PAH’s while  between PAH’s and fish weight it was significant only in cold season (P<0.05).Considering the 52.63 ppb (dry weight) as the highest measured concentration of PAH’s in this study and 30 µg/kg (wet weight) as the maximum allowable contamination level for aquatic organisms it can be concluded that the PAH’s concentration in Pike’s muscle is almost within the allowable limit in Anzali Wetland.

To determine level of PCBs in skin and muscle of Cyprinus carpio and Esox lucius fishes  in the west part of Anzali Wetland in Abkenar in autumn (Dec.2010) 4 sampling stations were selected .Samples of water, sediment, suspended particles in water, C. carpio and E. lucius fishes were collected from Abkenar, Anzali Wetland. Nine fish samples were caught from each species. Collected samples of water, sediment, suspended particles and fish were transferred to laboratory. After preparation, extract and clean up of the samples, analyses of PCBs were carried out using Gas Chromatography (GC-ECD) with Ni63 ionization detector. PCB average concentration was 24.36 ng/g(dried weight) in  Esox  lucius skin, 14.36 ng/g in E.  lucius mussel  tissue, 21.82 ng/g C. carpio skin and 20.86 ng/g in C. carpio mussel tissue. Coefficient Variation (CV) of average concentration PCBs in E. lucius skin tissue was higher than other tissues. Based on statistical analysis, there were a significant difference between E.  lucius mussels &  skin tissue & C. carpio mussels &  skin tissue  )p(. There were also significant difference between PCBs concentration in water with PCBs concentration in sediment (pC. carpio tissue and filtered suspended particles in water was seen (p<0.05, r=0.851, r2=76%, n=9) and a very strong positive correlation was found between PCBs concentration in water and filtered suspended particles in water (pE.  lucius skin tissue was 5835.69 µg/g, in E.  lucius mussels  tissue was 3440.58 µg/g, in C. carpio skin tissue was 5232.28 µg/g and in C. carpio mussels tissue was 4997.63 µg/g. The real average (with accuracy of 95%) of PCBs in fish tissues (Max. 0.03653 ppm and Min. 0.01025 ppm) in autumn was less than FDI Standards and Australia Food / NZ MRL standards and more than USEPA standard.