Glutathione Peroxidase Activity in the Blood of Tunas and Marlins

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  • Glutathione Peroxidase Activity in the

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Abstract

The glutathione peroxidase activity (GHS-Px) in eleven blood specimens of two species of tuna, i.e., nine individuals of yellow fin tuna Thunnus albacares and two individuals of big-eyed tuna Thunnus obesus, and in seven blood specimens of four species of marlin, i.e., three individuals of striped marlin Tetrapturus audax, two individuals of blue marlin Makaira mazara, one individual of swordfish Xiphias gladius and one individual of sailfish Istipohorus platyterus, are presented in relation to the distribution of selenium and mercury.<br> GSH-Px in the blood of tunas was high compared with that of marlins, as in the cases of the selenium and mercury concentrations. In both species, GSH-Px did not significantly correlate with the concentration of the low oxidation state of selenium. On the other hand, GSH-Px correlated netatively with the total mercury concentration in the case of marlins while there was no correlation in the case of tunas. These findings may suggest that since there are few protein-containing selenohydryl groups with mercury as organic selenium in the blood of marlins, GSH-Px tends to drastically decrease with mercury accumulation.

Journal

  • Fisheries science

    Fisheries science 61 (5), 867-870, 1995

    The Japanese Society of Fisheries Science

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