1,720,999 research outputs found
Total and methylmercury residues in cartilagineous fish from Mediterranean Sea
No full textConcentrations of mercury and methylmercury residues were determined in the muscle tissue of three cartilaginous fishes Chimaera monstrosa (ghostshark), Torpedo nobiliana (electric ray) and Myliobatis aquila (eagle ray) from the Mediterranean Sea. The highest mean levels of total mercury were detected in ghostshark (3.14 mg/kg wet weight), followed by electric ray (2.42 mg/kg wet weight), and eagle ray (0.83 mg/kg wet weight). Such a variability is influenced by quite a number of factors, among which size, fish ecology and feeding habits. The percentages of the methylated form to total mercury ranged from a minimum of 72% in eagle ray to a maximum of 83% in ghostshark. Relationship between specimen size and mercury and methylmercury concentrations were found in ghostshark species.[...
Total mercury in muscle of benthic and pelagic fish from the south Adriatic sea (Italy)
No full textTotal mercury concentrations were measured from the muscle of different kinds of fish: yellow gurnard (Trigla lucerna), red gurnard (Aspitrigla cuculus) red fish (Helicolenus dactylopterus), skate spp. (Raje spp.), goldline (Sarpa salpa), atlantic bonito (Sarda sarda), mackerel (Scomber scombrus), chub mackerel (Scomber japonicus) caught in the South Adriatic Sea (south Italy) in the period June/August 1995. The highest total mercury levels were found in the benthic marine organisms and particularly in skates (Raje spp.) whose values ranged from 0.05 to 2.65 mg/kg wet wt with a mean value of 1.02 mg/kg wet wt. As for pelagic species, the highest mean levels were observed in Atlantic bonito (0.34 mg/kg wet wt), while in goldline the mean content of total mercury was the lowest (0.07 mg/kg wet wt). According to the rules in force (Official Journal of the European Communities 1994) 53% of skate and Atlantic bonito samples showed concentrations exceeding the peak value of 1 mg/kg, while for the other species, only 28% of samples exceeded the peak value fixed at 0.5 mg/kg. Correlations between total mercury concentration and specimen weight were evident in all examined species except for goldline and skates.[...
Total mercury and methylmercury in tuna fish and sharks from the south Adriatic sea
No full textTotal mercury and metylmercury concentrations were measured in tuna fish and sharks from the South Adriatic Sea. The highest mean levels of total mercury were found in Squalus acanthias (6.5 mg/Kg w.w.). In the other species mean mercury levels were notably lower (0.46 mg/Kg w.w. for Auxis rochey; 0.38 mg/Kg w.w. for Prionace glauca). Twenty-two percent of the Auxis rochei samples exceed the legal Italian limit (0.50 mg/Kg w.w.) as specified by the European Commission Directive. No sample of Prionace glauca exceed the legal limit of 1 mg/Kg wet.[...
Polycyclic aromatic hydrocarbons, polychlorinated biphenyls, chlorinated pesticides (DDTs), hexachlorocyclohexane and hexachlorobenzene residues in smoked seafood
No full textSmoked seafoods were screened for the presence of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and other organochlorine compounds. Total PAH concentrations ranged from 46.5 ng/g (wet weight) for smoked swordfish to 124.0 ng/g (wet weight) for smoked herring. Among the carcinogenic PAHs, benzo(a)pyrene ranged from undetectable levels for several smoked fish to 0.7 ng/g for Scottish salmon, dibenzo(ah)anthracene was not present in any of the samples analyzed, and benzo(a)anthracene was found in all samples and at particularly high levels in salmon (23.2 ng/g). Benzo(a)pyrene concentrations were below the tolerance limit for all samples. PCB concentrations for the different samples ranged from 2 to 30 ng/g. Chlorinated pesticides (DDTs: p,p'-DDE, p,p'-DDT, o,p'-DDT, p,p'-DDD, and o,p'-DDD) were detected at levels ranging from 0.2 ng/g (wet weight) in bluefin tuna to 17.5 ng/g (wet weight) in salmon. Hexachlorocyclohexane isomers (alphaHCH + betaHCH + gammaHCH) were present in higher amounts in eels (6.5 ng/g) than in the other smoked fish. For 40% of the samples, PCB concentrations exceeded the limit fixed by the European Union, while pesticide levels were below the maximum acceptable limit proposed by the Food and Agriculture Organization.[...
Relationship between total mercury concentration and fish size in two pelagic fish species: implications for consumer health
No full textTotal mercury concentrations were determined in different size classes of two pelagic fish species of great commercial importance, horse mackerel (Trachurus trachurus) and Mediterranean horse mackerel (Trachurus mediterraneus), to evaluate the relationship between total mercury concentration and fish size and to determine whether any differences might affect the quantitative assessment of mercury exposure for consumers. Mercury concentrations in horse mackerel and in Mediterranean horse mackerel were between 0.16 and 2.41 mu g g(-1) of weight wet (mean, 0.68 mu g g(-1)) and between 0.09 and 1.62 mu g g(-1) (mean, 0.51 mu g g(-1)), respectively. The regression curves revealed a significant relationship between mercury concentration and fish size (length and weight) for both species. Concentrations exceeding the proposed limit for human consumption were observed in 33.3% of the samples of both species and were associated with larger specimens. The consumption of the larger specimens could lead to an increase in mercury exposure for consumers. Estimated weekly intakes, calculated on the basis of concentrations relative to each size class, revealed a high exposure associated with the consumption of fish larger than 30 cm (horse mackerel, 11.63 to 20.16 mu g/kg of body weight; Mediterranean horse mackerel, 5.86 to 13.55 mu g/kg of body weight). An understanding of the factors leading to an increase in mercury exposure can help consumers make informed decisions about eating fish. [...
Mercury accumulation and speciation in muscle tissue of different species of sharks from Mediterranean sea, Italy
No full textContamination by polychlorinated biphenyls (PCBs) in striped dolphins (Stenella coerulealba) from in Southeastern Mediterranean Sea
No full textConcentrations of polychlorinated biphenyls (PCBs) including dioxin-like PCBs (non-ortho, PCB 77, PCB 126, and PCB 169 and mono-ortho, PCB 105, PCB 118, and PCB 156) were measured in different organs and tissues (melon, blubber, liver, kidney, lung, heart, and muscle tissue) of striped dolphins (Stenella coeruleoalba) from the Eastern Mediterranean Sea (Adriatic Sea). The mean highest levels were in blubber and melon, followed by liver, kidney, lung, heart, and muscle tissue. PCB profiles were similar in all tissues and organs being dominated by the higher chlorinated homologues (hexa-CBs, 55.8-62.1%; penta-CBs, 15.4-20.0%; and hepta-CB PCB 180, 12.7-16.5%). Major PCBs in all tissues were congeners 138 and 153 collectively accounting for 50.6-58.3% of the total PCB concentrations, followed by PCB 101, 105, 118, and 180 constituting from 27.0% to 31.0%. PCB levels were higher in adult males than in adult females. The estimated 2,3,7,8-TCDD toxic equivalents of non- and mono-ortho PCBs were much higher than the threshold level above which adverse effects have been observed in other marine mammals species, suggesting that striped dolphins in this region are at risk for toxic effects.[...
Cyclooxygenase-2 (COX-2) and 5-lipoxygenase (5-LOX) in porcine pleuropneumonia by Actinobacillus pleuropneumoniae: Biochemical and immunohistochemical investigations
No full textPolychlorinated biphenyl (PCBs), dioxins and furans (PCDD/Fs): Occurence in fishery products and dietary intake
No full textConcentrations and congener specific profiles of PCBs, PCDDs and PCDFs were determined in variousedible fish from the Adriatic Sea. PCBs were the dominant chemicals (116–1980 ng g1 lipid wt), followedby PCDFs (ND-58.3 pg g1 lipid wt) and PCDDs (ND-20 pg g1 lipid wt). The levels of these contaminantsvaried among species. Benthic organisms possessed the highest concentrations, followed by demersaland pelagic fish species. PCB and PCDD/F accumulation pattern in the samples analysed showed a distributiontypically reported for marine samples. The mean weekly intake of toxic equivalency (TEQ) wasestimated to be 0.84 pg TEQs/kg bw/week. The dioxin-like PCBs accounted for more than 77% of thisintake, followed by PCDDs (15.5%) and PCDFs (13.1%). In general, the samples analysed in this surveycan be considered safe with regard to the levels obtained and the in-force legislation, nevertheless theconsumption of some species may be of significance importance for consumer health.[...
Healt risk of coplanar polychlorinated biphenyl congeners in edible fish from the Mediterranean sea
No full textThe muscle tissue of different species of fish was analyzed for polychlorinated biphenyls (PCBs) in order to estimate the daily intake of these contaminants. Contamination levels among the different species varied between 108 and 678 ng/g lipid weight. Isomer-specific analysis in the muscle tissue of the various fish revealed a profile dominated by hexa- and pentachlorobiphenyls, followed by hepta- and tetrachlorobiphenyls. Other congeners, including those with fewer than four or more than nine chlorine atoms, were below the instrumental limit of detection in all samples. PCB dietary intake was below the range of 1 to 4 pg 2,3,7,8-tetrachloro-p-dioxin equivalents per kg body weight per day set by the World Health Organization. From a public health point of view, there is no indication of important risks associated with the consumption of these seafoods.[...
- …
