RESUMO
Selenium and mercury were evaluated in tissues and stomachs of the dolphinfish Coryphaena hippurus from two sites in the Southeastern Gulf of California. Hg levels were consistently low and exhibited the following patterns: muscle (0.14⯱â¯0.01⯵g/g wet weight) followed by kidney (0.12⯱â¯0.02⯵g/g), liver (0.11⯱â¯0.01⯵g/g), and gonads (0.04⯱â¯0.00⯵g/g). The maximum of Se was found in the kidney (5.60⯱â¯0.40⯵g/g) and the minimum in muscle (0.60⯱â¯0.01⯵g/g). All the Se:Hg molar ratios were between 3.7 and 697.1, with the minimum in muscle and the highest in gonads. The results indicate a contrasting behavior biomagnification of Hg and Se; smaller fish (<80â¯cm FL) did not exhibit biomagnification, in contrast with larger fish (>90â¯cm FL: 100% for Hg; 65% for Se). These results appear to be related to different feeding habits and availability of prey.
Assuntos
Conteúdo Gastrointestinal/química , Mercúrio/análise , Perciformes , Selênio/análise , Poluentes Químicos da Água/análise , Animais , Exposição Dietética/efeitos adversos , Feminino , Produtos Pesqueiros/análise , Contaminação de Alimentos/análise , Humanos , Rim/química , Masculino , Mercúrio/farmacocinética , México , Músculos/química , Oceano Pacífico , Medição de Risco , Selênio/farmacocinética , Distribuição Tecidual , Poluentes Químicos da Água/farmacocinéticaRESUMO
Mercury and selenium were assessed in the sailfish, Istiophorus platypterus, from the Eastern Pacific. Sixty-seven individuals were sampled, muscle, liver, kidney, gonads and the prey found in the stomach contents were isolated during fishing 2011-2013 tournaments. Hg exhibited the following pattern (µg g(-1) wet weight): liver (0.57 ± 0.07)>muscle (0.56 ± 0.04)>kidney (0.44 ± 0.08)>gonad (0.14 ± 0.01). The maximum concentration of Se was found in kidneys (14.1 ± 1.9 µg g(-1)), and the minimum in muscles (0.67 ± 0.03 µg g(-1)). High Se:Hg ratios were found for muscle (4.1 ± 0.3), kidney (132.4 ± 12.1), liver (54.0 ± 4.4) and gonads (88.2 ± 7.9); Hg:Se molar ratios were several orders of magnitude lower (muscle<0.4 and liver, kidney and gonad<0.03). Sailfish feed mainly on fishes and cephalopods with low Hg levels (<0.13 µg g(-1)), these results indicate biomagnification of Hg and Se. The muscle of I. platypterus should be consumed (according the provisional tolerable weekly intake) by people cautiously so as not to exceed the recommended intake of 215 g per week.