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In total, 496 fish (22 species) were sampled. Nine species had <jats:styled-content style=\"fixed-case\">THg<\/jats:styled-content> concentrations above the limit recommended by the World Health Organisation (0\u00b75\u2009\u00b5g g<jats:sup>\u22121<\/jats:sup> wet mass), and one exceeded the recommended level for Hg in predatory fishes by Brazilian law (1\u00b70\u2009\u00b5g g<jats:sup>\u22121<\/jats:sup>). The average concentration of <jats:styled-content style=\"fixed-case\">THg<\/jats:styled-content> increased significantly with trophic guild (herbivorous to piscivorous) and trophic level, with higher accumulation in fishes with greater total length. Ninety\u2010six per cent of all mercury was methylated. These results suggest that feeding habits determine <jats:styled-content style=\"fixed-case\">THg<\/jats:styled-content> concentrations in fishes and that Hg elimination rate is slow during growth, which allows greater accumulation. These findings show that fishes in the Bacaj\u00e1 River contain high concentrations of <jats:styled-content style=\"fixed-case\">THg<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">MeHg<\/jats:styled-content>.<\/jats:p>","DOI":"10.1111\/jfb.13027","type":"journal-article","created":{"date-parts":[[2016,5,31]],"date-time":"2016-05-31T05:36:41Z","timestamp":1464673001000},"page":"249-263","source":"Crossref","is-referenced-by-count":63,"title":["Mercury and methyl mercury in fishes from Bacaj\u00e1 River (Brazilian Amazon): evidence for bioaccumulation and biomagnification"],"prefix":"10.1111","volume":"89","author":[{"given":"J.","family":"Souza\u2010Araujo","sequence":"first","affiliation":[{"name":"Aquatic Ecology Group Federal University of Par\u00e1  Avenida Perimetral 2651, Terra Firme 66040170 Bel\u00e9m PA Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T.","family":"Giarrizzo","sequence":"additional","affiliation":[{"name":"Aquatic Ecology Group Federal University of Par\u00e1  Avenida Perimetral 2651, Terra Firme 66040170 Bel\u00e9m PA Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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