In this paper, the presence and amount of mercury and polychlorobiphenyls (PCBs) were determined in 23 bluefin tuna samples collected in the spring of 2012 in Porto Scuso (South West Sardinia, Italy) and Villa Putzu (South East Sardinia, Italy) in order to assess the current levels of these two contaminants in fish muscle and the consequent risk to humans consuming said fish. Values of polychlorobiphenyls in bluefin tuna muscle vary between 0.155 and 1.403 mg/kg f.w.; the average of PCBs in tuna muscle is 0.732 mg/kg f.w. With regard to PCBs the presence of more elevated concentrations is confirmed in larger fish. The results regarding mercury in muscle show an average of 0.660 mg/kg f.w. and mercury values vary between 0.140 f.w. and 2.211 mg/kg f.w.; for mercury as well, the highest concentrations were found in the largest bluefin tuna. Six samples, 26% of total, contained more than 1 mg/kg f.w., which is the maximum level set by the European Commission (EC, Regulation n. 1881/2006) for this species. Mercury, in particular methylmercury, poses a risk to public health, therefore, taking into account the important nutritional contribution that tuna fish makes to the diet, it is advisable that women of childbearing age, pregnant and breastfeeding women as well as young children strictly limit their consumption of tuna from this area of the Mediterranean.
KeywordsBluefin TunaHuman ConsumptionMercuryPCBs
W. S. Broecker and R. Gerard, “Natural Radiocarbon in the Mediterranean Sea,” Limnology and Oceanography, Vol. 14, No. 6, 1969, pp. 883-888.
K. Kannan, S. Corsolini, J. Falandysz, G. Oehme, S. Focardi and J. P. Giesy, “Perfluoroctanesulfonate and Related Fluorinated Hydrocarbons in Marine Mammals, Fishes and Birds from Coasts of the Baltic and Mediterranean Seas,” Environmental Sciences and Technology, Vol. 36, No. 15, 2002, pp. 3210-3216.
K. Kannan, S. Corsolini, T. Imagawa, S. Focardi and J. P. Giesy, “Polychlorinated -Naphthalenes, -Biphenyls, -Dibenzop-Dioxins and -Dibenzofurans in Bluefin Tuna, Swordfish, Cormorants and Barn Swallows from Italy,” Ambio, Vol. 31, No. 3, 2002, pp. 207-211.
P. Stefanelli, A. Ausili, A. Di Muccio, M. C. Fossi, S. Di Muccio, S. Rossi and A. Colasanti, “Organochlorine Compounds in Tissues of Swordfish (Xiphias gladius) from Mediterranean Sea and Azores Islands,” Marine Pollution Bulletin, Vol. 49, No. 11-12, 2004, pp. 938-950.
S. Damiano, P. Papetti and P. Menasatti, “Accumulation of Heavy Metals to Assess the Health Status of Swordfish in a Comparative Analysis of Mediterranean and Atlantic Areas,” Marine Pollution Bulletin, Vol. 62, No. 8, 2011, pp. 1920-1925. http://dx.doi.org/10.1016/j.marpolbul.2011.04.028
C. Leonzio, E. Bacci, S. Focardi and A. Renzoni, “Heavy metals in organisms from the Northern Tyrrhenian Sea,” Science of the Total Environment, Vol. 20, No. 3, 1981, pp. 131-146. http://dx.doi.org/10.1016/0048-9697(81)90059-0
S. Corsolini, C. Guerranti, G. Perra and S. Focardi, “Polybrominated Diphenyl Ethers, Perfluorinated Compounds and Chlorinated Pesticides in Swordfish (Xiphias gladius) from the Mediterranean Sea,” Environmental Sciences and Technology, Vol. 42, No. 12, 2008, pp. 4344-4349. http://dx.doi.org/10.1021/es703057f
A. Renzoni, M. Bernhard, R. Sara and M. Stoeppler, “Comparison between the Hg body burden of Thunnus thynnus from the Mediterranean and the Atlantic,” IVes Journées Estud. Pollut, Antalya C.I.E.S.M., Antalia, 1978, pp. 255-260.
C. Leonzio, E. Bacci, S. Focardi and A. Renzoni, “Heavy Metals in Organisms from the Northern Tyrrhenian Sea,” Science of the Total Environment, Vol. 20, No. 2, 1981, pp. 131-146. http://dx.doi.org/10.1016/0048-9697(81)90059-0
A. Renzoni, S. Focardi, C. Fossi, C. Leonzio and J. Mayol, “Comparison between Concentration of Mercury and Other Contaminants in Eggs and Tissues of Adults of Cory’s Shearwater (Calonectris diomedea) Collected on Atlantic and Mediterranean Islands,” Environmental Pollution Series A, Vol. 40, No. 1, 1986, pp. 17-35. http://dx.doi.org/10.1016/0143-1471(86)90055-3
C. Leonzio, C. Fossi and S. Focardi, “Lead, Mercury, Cadmium and Selenium in Two Species of Gull Feeding on Dumps and in Marine Areas,” Science of the Total Environment, Vol. 57, 1986, pp. 121-127. http://dx.doi.org/10.1016/0048-9697(86)90017-3
K. Kannan, S. Tanabe, A. Borrell, A. Aguilar, S. Focardi and R. Tatsukawa, “Isomer-Specific Analysis and Toxic Evaluation of Polychlorinated Biphenyls in Striped Dolphins Affected by an Epizootic in the Western Mediterranean Sea,” Archives of Environmental Contamination and Toxicology, Vol. 25, No. 2, 1993, pp. 227-233. http://dx.doi.org/10.1007/BF00212134
A. Borrell, A. Aguilar, S. Corsolini and S. Focardi, “Evaluation of the Toxicity and Sex-Related Variation of PCB Levels in Mediterranean Striped Dolphins Affected by an Epizootic,” Chemosphere, Vol. 32, No. 12, 1996, pp. 2359-2369. http://dx.doi.org/10.1016/0045-6535(96)00143-9
S. Focardi, “Levels of Mercury and Polychlorobiphenyls in Commercial Food in Siena Province (Tuscany, Italy) in the Period 2001-2010,” Microchemical Journal, Vol. 105, 2012, pp. 60-64. http://dx.doi.org/10.1016/j.microc.2012.01.013
S. Corsolini, A. Ademollo, T. Romeo, S. Greco, S. Focardi, “Persistent Organic Pollutants in Edible Fish: A Human and Environmental Health Problem,” Microchemical Journal, Vol. 79, No. 1-2, 2005, pp. 115-123. http://dx.doi.org/10.1016/j.microc.2004.10.006
M. M. Storelli, R. Giacominelli-Stuffler, A. Storelli and G. O. Marcotrigiano, “Accumulation of Mercury, Cadmium, Lead and Arsenic in Swordfish and Bluefin Tuna from the Mediterranean Sea: A Comparative Study,” Marine Pollution Bulletin, Vol. 50, No. 9, 2005, pp. 993-1018. http://dx.doi.org/10.1016/j.marpolbul.2005.06.041
M. M. Storelli, R. Giacominelli-Stuffler and G. O. Marcotrigiano, “Total and Methylmercury Residues in Tuna-Fish from the Mediterranean Sea,” Food Additives & Contaminants, Vol. 19, No. 8, 2002, pp. 715-720. http://dx.doi.org/10.1080/02652030210153569
S. Focardi, C. Fossi, C. Leonzio and R. Romei, “PCB Congeners, Hexachlorobenzene, and Organochlorine Insectidices in Human Fat in Italy,” Bulletin of Environmental Contamination and Toxicology, Vol. 36, No. 1, 1986, pp. 644-650. http://dx.doi.org/10.1007/BF01623563
S. Focardi and R. Romei, “Fingerprint of Polychlorinated Biphenyl Congeners in Samples of Human Subcutaneous Adipose Tissue,” Chemosphere, Vol. 16, No. 10-12, 1987, pp. 2315-2320. http://dx.doi.org/10.1016/0045-6535(87)90288-8
S. Corsolini, S. Focardi, K. Kannan, S. Tanabe and R. Tatsukawa, “Isomer-Specific Analysis of 250 Polychlorinated Biphenyls and 2,3,7,8-Tetrachlorodibenzo-p-Dioxin Equivalents (TEQs) in Red Fox and Human Adipose Tissue from Central Italy,” Archives of Environmental Contamination and Toxicology, Vol. 29, No. 1, 1995, pp. 61-68. http://dx.doi.org/10.1007/BF00213088
M. Mariottini, S. Aurigi and S. Focardi, “Congener Profile and Toxicity Assessment of Polychlorinated Biphenyls in Human Adipose Tissue of Italians and Chileans,” Microchemical Journal, Vol. 67, No. 1-3, 2000, pp. 63-71. http://dx.doi.org/10.1016/S0026-265X(00)00100-4
M. Mariottini, C. Guerranti, S. Aurigi, I. Corsi and S. Focardi, “Pesticides and Polychlorinated Biphenyl Residues in Human Adipose Tissue,” Bulletin of Environmental Contamination and Toxicology, Vol. 68, No. 1, 2002, pp. 72-78.
C. Guerranti, M. Palmieri, M. Mariottini and S. E. Focardi, “Persistent Organic Pollutants in Human Milk from Central Italy: Levels and Time Trends,” ISRN Toxicology, Vol. 2011, 2011, Article ID 107514, 6 p.
J. M. Formentin, “ICCAT Manual, Ch.2.1.5: Atlantic Bluefin Tuna,” 2006, pp. 93-111.
J. Vinas, A. Gordoa, R. Fernández-Cebrián, C. Pla, ü. Vahdet and R. M. Araguas, “Facts and Uncertainties about the Genetic Population Structure of Atlantic Bluefin tuna (Thunnus thynnus) in the Mediterranean. Implications for Fishery Management,” Reviews in Fish Biology and Fisheries, Vol. 21, No. 3, pp. 527-541. http://dx.doi.org/10.1007/s11160-010-9174-6
C. Reeb, “Genetic Discontinuity of Big Fish in a Small Sea,” PNAS, Vol. 107, No. 6, 2010, pp. 2377-2378. http://dx.doi.org/10.1073/pnas.0914639107
G. Riccioni, M. Landi, G. Ferrara, I. Milano, A. Cariani, L. Zane, M. Sella, G. Barbujani and F. Tinti, “Spatio-Temporal Population Structuring and Genetic Diversity Retention in Depleted Atlantic Bluefin Tuna of the Mediterranean Sea,” PNAS, Vol. 107, No. 5, 2010, pp. 2102-2107. http://dx.doi.org/10.1073/pnas.0908281107
S. Corsolini, S. Focardi, K. Kannan, S. Tanabe, A. Borrell and R. Tatsukawa, “Congener Profile and Toxicity Assessment of Polychlorinated Biphenyls in Dolphins, Sharks and Tuna Fish from Italian Coastal Waters,” Marine Environmental Research, Vol. 40, No. 1, 1995, pp. 33-53. http://dx.doi.org/10.1016/0141-1136(94)00003-8
J. M. Fromentin, “The East-Atlantic and Mediterranean Bluefin Tuna Stock Management: Uncertainties and Alternatives,” Scientia Marina, Vol. 67, No. S1, 2003, pp. 51-62.
S. Focardi and M. Renzi, “Polybrominated Diphenyl Ethers and Polychlorobiphenyls in Fish from the Ionian Sea (Western Mediterranean),” Journal of Environmental Protection, Vol. 3, No. 3, 2012, pp. 135-140. http://dx.doi.org/10.4236/jep.2012.32017
M. Stoeppler, M. Bernhard, F. Backhaus and E. Schulte, “Comparative Studies on Trace Metals in Marine Biota. I. Mercury in Marine Organisms from Western Italian Coast, the Strait of Gibraltar and the North Sea,” Science of the Total Environment, Vol. 13, No. 3, 1979, pp. 209-223. http://dx.doi.org/10.1016/0048-9697(79)90102-5
C. Leonzio, E. Bacci, S. Focardi and A. Renzoni, “Heavy Metals in Organisms from the Tyrrhenian Sea,” Science of the Total Environment, Vol. 20, No. 2, 1981, pp. 131-146. http://dx.doi.org/10.1016/0048-9697(81)90059-0
M. Bernhard and A. Renzoni, “Mercury Concentration in Mediterranean Marine Organisms and Their Environment: Natural or Anthropogenic Orgin?” Thalassia Jugoslavica, Vol. 13, 1977, pp. 265-300.
M. M. Storelli, R. Giacomelli Stuffler and G. O. Marcotrigiano, “Total and Methylmercury Residues in Tuna-Fish from the Mediterranean Sea,” Food Additives and Contaminants, Vol. 19, No. 8, 2002, pp. 715-720. http://dx.doi.org/10.1080/02652030210153569
P. Licata, D. Trombetta, M. Cristani, C. Naccari, D. Martino, M. Calò and F. Naccari, “Heavy metals in lliver and muscle of bluefin tuna (Thunnus thynnus) caught in the Strait of Messina (Sicily, Italy),” Environmental Monitoring and Assessment, Vol. 107, No. 1, 2005, pp. 239-248. http://dx.doi.org/10.1007/s10661-005-2382-1
B. C. Chase, “Differences in Diet of Atlantic Bluefin Tuna (Thunnus thynnus) at Five Seasonal Feeding Grounds on the New England Continental Shelf,” Fishery Bulletin, Vol. 100, No. 2, 2002, pp. 168-180.
M. C. Fossi, S. Casini, L. Marsili, S. Ancora, G. Mori, G. Neri, T. Romeo and A. Ausili, “Evaluation of Ecotoxicological Effects of Endocrine Disrupters during a Four Year Survey of the Mediterranean Population of Swordfish (Xiphias gladius),” Marine Environmental Research, Vol. 58, No. 2-5, 2004, pp. 425-429. http://dx.doi.org/10.1016/j.marenvres.2004.03.026
EFSA, “Opinion of the Scientific Panel on Contaminants in the Food Chain on a Request from the Commission Related to Mercury and Methylmercury in Food,” The EFSA Journal, Vol. 34, 2004, pp. 1-14.