جستجوی مقالات مرتبط با کلیدواژه "chromium" در نشریات گروه "شیلات"

This research aimed to investigate and identify the accumulation of heavy metals cadmium and chromium in the liver tissue of Asian seabass (Lates calcarifer) cultured in cages and some of its physiological indicators. Sampling for this study was conducted in cages located in Bandar Kangan, Bushehr Province. After transfer to the laboratory, fish biometric indices were measured, including weight in grams using a scale and total length in centimeters using a biometric board. Liver tissue samples were collected from each fish specimen and analyzed using flame atomic absorption spectrophotometry to determine the concentration of each metal. For tissue analysis, liver samples were isolated after dissection. All stages of tissue passage, including dehydration, clearing, and impregnation, were performed using a tissue processor or histokinet under a scheduled program. Samples were stained using the hematoxylin-eosin method, and the effects of each heavy metal were analyzed separately. Superoxide dismutase, catalase, malondialdehyde, and acetylcholinesterase enzymes were measured using commercial kits according to their instructions. The mean concentrations of cadmium and chromium in the liver tissue of the fish samples were 0.13 and 3.13 mg/g, respectively. The mean concentrations of superoxide dismutase, catalase, and malondialdehyde enzymes were 62.33 U/L, 64.33 U/L, and 58.66 U/L, respectively. Liver tissue pathology results showed that all studied fish liver samples were unhealthy. Examination of Asian seabass liver tissue samples revealed severe necrosis of liver cells (hepatocytes) in all samples, extensive congestion and hemorrhage, mild cellular atrophy and fatty degeneration, as well as cellular hypertrophy in the samples. It appears that the observed liver tissue damage and enzymatic changes may be a result of contamination by the heavy metals chromium and cadmium.

Pike (Esox lucius) is a native species in Anzali wetland and because of its flesh it has been interested to people for a long time. This study was done to compare the rate of accumulation and concentration of pollutants, heavy metals such as lead and chromium in edible muscle tissue of pike at three stations (West, Central, and East) of Anzali wetland. In this study, fishes were randomly caught in the number of 10 from each station in standard weights by gill nets. After removal of the tissue samples, for chemical digestion true mixed acid digestion (HNO3 / HCLO4) was performed on samples. Heavy metal concentrations were measured using flame atomic absorption spectrophotometer. The results showed that the average concentration of lead metal in the Catfish were 0.52, 0.45 and 0.49 μg/g dry weight and the average concentration of chromium metal in the Catfish 0.08, 0.14 and 0.09 μg/g dry weight were observed for West, Center and East of Wetland, respectively. In this study, concentrations of lead and chromium in edible muscle tissue pike did not show significant difference between stations (P>0.05). The lead and chromium standards in American Food and Drug Administration (FDA), World Health Organization (WHO) were compared. The results showed that compared with the standard WHO= 0.5 toxicity of lead in samples of West wetland was observed more than permissible limit that this could be a warning of a threat to the health of these fish in vulnerable groups of society.

Caviar is the most important and the major production of sturgeons, but the benefits of these fish are not limited only to caviar. Acipenser baerii is one of the most common breeding sturgeon species in European aquaculture. According to the breeding this kind of sturgeon in Iran, there are attempt for using the technical knowledge and processing industries for application the other organs including skin, digestive system, cartilage, spinal cord, etc. in the leather, food, pharmaceutical, and cosmetic industries. In this study, the effect of chromium on the quality of produced leather from Acipenser baerii’s skin was investigated. At first, the salt to fish skin ratio 1:1 and 1:2 was carried out during 0, 5, 10, 15 and 20 days to select the best treatment. According to the results, treatment with 1:2 ratio at day 5 was showed the better conditions. The samples were subjected to color stability, abrasion stability, sewing capability, tensile strength, tearing strength, adhesion stability, and thermal resistance experiments to determine the quality of produced lather. The sturgeon's skins were passed all chromium tanning process. All of the above experiments were carried out to evaluate the quality of produced leather. The results are indicated the acceptable quality in terms of physical and apparent.