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Effects of dietary methylmercury on growth performance and tissue burden in juvenile green (Acipenser medirostris) and white sturgeon (A. transmontanus)

Lee, Jang-Wong and De Riu, Nicola and Lee, Seunghyung and Bai, Sungchul Charles and Moniello, Giuseppe and Hung, Silas S. O. (2011) Effects of dietary methylmercury on growth performance and tissue burden in juvenile green (Acipenser medirostris) and white sturgeon (A. transmontanus). Aquatic Toxicology, Vol. 105 (3-4), p. 227-234. ISSN 0166-445X. eISSN 1879-1514. Article.

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DOI: 10.1016/j.aquatox.2011.06.013

Abstract

Triplicate groups of juvenile green and white sturgeon (30 ± 2 g) were exposed to one of the four nominal concentrations of dietary methylmercury (MeHg, 0 (control), 25, 50, and 100 mg MeHg/kg diet) for 8 weeks to determine and compare the effects on growth performance and mercury (Hg) tissue burden in the two sturgeon species. Mortality, growth performance as measured by percent body weight increase per day, hepatosomatic index, proximate composition of whole body, and Hg burden in the whole body, gill, heart, liver, kidney, and white muscle were determined to assess the adverse growth effects and bioaccumulation of dietary MeHg in sturgeon. Significantly higher mortality and lower growth rate (p < 0.05) were noted in green and white sturgeon fed the MeHg diets compared to the controls. Green sturgeon fed the MeHg diets exhibited earlier and more severe adverse effects compared to white sturgeon. Mercury accumulated in all tissues in a dose-dependent manner regardless of species, and the highest Hg concentrations were found in the kidneys of both species. Dietary MeHg had no significant effect (p > 0.05) on the whole body proximate compositions of either sturgeon species. In conclusion, green sturgeon was more susceptible to dietary MeHg toxicity than white sturgeon in our 8-week growth experiment based on the higher mortality and lower growth rate and body energy contents.

Item Type:Article
ID Code:6367
Status:Published
Refereed:Yes
Uncontrolled Keywords:Methylmercury, mercury toxicity, green sturgeon, white sturgeon, growth, tissue burden
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/18 Nutrizione e alimentazione animale
Divisions:001 Università di Sassari > 01 Dipartimenti > Biologia animale
Publisher:Elsevier
ISSN:0166-445X
eISSN:1879-1514
Copyright Holders:© 2011 Elsevier
Deposited On:22 Aug 2011 11:11

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