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Synergistic effects of dietary vitamin E and selenomethionine on growth performance and tissue methylmercury accumulation on mercury‐induced toxicity in juvenile olive flounder, Paralichthys olivaceus (Temminck et Schlegel)
Author(s) -
Moniruzzaman Mohammad,
Park Gunhyun,
Yun Hyeonho,
Lee Seunghan,
Park Youngjin,
Bai Sungchul C
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12904
Subject(s) - paralichthys , methylmercury , olive flounder , biology , selenium , toxicity , vitamin , vitamin e , zoology , mercury (programming language) , feed conversion ratio , flounder , weight gain , food science , endocrinology , medicine , body weight , biochemistry , chemistry , fishery , antioxidant , fish <actinopterygii> , ecology , bioaccumulation , organic chemistry , computer science , programming language
An 8‐week feeding trial was conducted to evaluate the synergistic effects of dietary vitamin E and selenomethionine (SeMet) on induced methylmercury (MeHg) toxicity in juvenile olive flounder P aralichthys olivaceus . Nine semi‐purified diets were formulated to contain three different vitamin E levels as DL ‐α‐tocopheryl acetate (0, 100 and 200 mg TA kg −1 diet) and three different selenium (Se) levels (0, 2 and 4 SeMet mg kg −1 diet) on the constant mercury toxicity level (20 mg MeHgkg −1 diet). Nine experimental diets, in a 3 2 factorial design (E 0 Se 0 , E 0 Se 2 , E 0 Se 4 , E 100 Se 0 , E 100 Se 2 , E 100 Se 4 , E 200 Se 0 , E 200 Se 2 and E 200 Se 4 ), were fed to triplicate groups of fish averaging 2.3 ± 0.04 g (mean ± SD ) in the semi‐recirculation system. After 8 weeks of feeding trial, vitamin E and Se showed significant effects on weight gain ( WG ) of fish ( P < 0.05). We found that there was a clear trend of increasing WG with elevating vitamin E and Se levels in the diets. Feed efficiency ( FE ), specific growth rate ( SGR ), protein efficiency ratio ( PER ) and survivability exhibited a similar trend with WG . Both antioxidants had significant interaction effects on FE and PER ( P < 0.05). Methylmercury concentrations in fish muscle, liver and kidney decreases in a dose‐dependent manner as dietary vitamin E and Se levels increase. Interestingly, the most significant interactive effects of vitamin E and Se were found in liver tissue for depleting Hg concentrations ( P < 0.05). These findings suggest that dietary vitamin E more than 100 mg TA kg −1 diet with 2 or 4 mg SeMet kg −1 ‐supplemented diets could have synergistic effects on growth and liver mercury bioaccumulation on MeHg‐induced toxicity in juvenile olive flounder.