Atlantic bluefin tuna (Thunnus thynnus) farmed in the Adriatic Sea
| Autor: | Andreja Prevendar-Crnić, Emil Ofner, Emil Srebočan, Jelena Pompe-Gotal |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Muscle tissue
General Veterinary 040301 veterinary sciences Maximum level Sardine chemistry.chemical_element 04 agricultural and veterinary sciences 010501 environmental sciences 01 natural sciences Mercury (element) 0403 veterinary science Fishery Animal science medicine.anatomical_structure Geography Herring chemistry Liver tissue medicine Mercury contamination Tuna 0105 earth and related environmental sciences |
| Zdroj: | Veterinární medicína. 52:175-177 |
| ISSN: | 1805-9392 0375-8427 |
| DOI: | 10.17221/2029-vetmed |
| Popis: | Levels of total mercury in the muscle (29 samples) and liver tissue (15 samples) of bluefin tuna (Thunnus thynnus) weighing 100-300 kg were determined by cold vapour atomic absorption (AA) spectroscopy. Tunas were previously captured in the waters of Malta, towed to the farm in the Adriatic Sea and fattened with defrosted herring and sardine for the period of 6 to 7 months. The purpose of the investigation was to determine the magnitude of mercury contamination and to ascertain whether the concentrations in muscle tissue exceeded the maximum level defined by the European Commission Decision (1 µg/g wet weight). Total mercury concentra - tions in the muscle tissue of tunas ranged from 0.49 to 1.809 (median 0.899 µg/g wet weight) while in the liver tissue it was from 0.324 to 3.248 (median 1.165 µg/g wet weight). Total mercury concentrations in six samples of sardine ranged from 0.050 to 0.072 µg/g wet weight while two samples of herring contained 0.020 and 0.053 µg/g wet weight. Twelve out of 29 (41%) muscle samples of tuna contained mercury above the maximum level defined by the European Commission Decision. It is generally believed that mercury levels in Mediterranean fish are higher than those of the other seas or oceans due to numerous deposits of mercury ores and metallic mercury in surrounding countries. |
| Databáze: | OpenAIRE |
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