| Summary: | The development of a marking technique which could be efficiently used to mass-mark different groups of salmonids, would be a great tool for fisheries and aquaculture management. The present study was conducted in order to evaluate a series of rare earth elements (REEs) as potential markers in scales of Atlantic salmon (Salmo salar L.) by addition of these elements to the feed. The results demonstrated that the five tested elements were clearly incorporated into the scales of the fish fed the supplemented diets. Fish marked with these elements can be successfully identified by chemical analysis of the scales by inductively coupled plasma mass spectrometry (ICP-MS). The elemental levels (except for lanthanum) in the scales of the treated fish were still significantly higher than those of the untreated fish 2 months after the labeled diets were administered, although these levels were markedly lower than the ones present right after the labeling. A long-term monitoring of the chemical concentrations in the scales is required to study the longevity of the induced marks. The background levels of the tested markers and some other elements were also analyzed and found to show interesting patterns. It is suggested that, in some instances, the natural chemical fingerprint of the scales may be enough to distinguish among fish groups. However, more research about the elemental background levels in the scales is needed in order to conclude with this. The development of a marking technique which could be efficiently used to mass-mark different groups of salmonids, would be a great tool for fisheries and aquaculture management. The present study was conducted in order to evaluate a series of rare earth elements (REEs) as potential markers in scales of Atlantic salmon (Salmo salar L.) by addition of these elements to the feed. The results demonstrated that the five tested elements were clearly incorporated into the scales of the fish fed the supplemented diets. Fish marked with these elements can be successfully identified by chemical analysis of the scales by inductively coupled plasma mass spectrometry (ICP-MS). The elemental levels (except for lanthanum) in the scales of the treated fish were still significantly higher than those of the untreated fish 2 months after the labeled diets were administered, although these levels were markedly lower than the ones present right after the labeling. A long-term monitoring of the chemical concentrations in the scales is required to study the longevity of the induced marks. The background levels of the tested markers and some other elements were also analyzed and found to show interesting patterns. It is suggested that, in some instances, the natural chemical fingerprint of the scales may be enough to distinguish among fish groups. However, more research about the elemental background levels in the scales is needed in order to conclude with this. FHF
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