Changes in Growth Performance,Metabolic Enzyme Activities,and Content of Fe,Cu, and Zn in Liver and Kidney of Tilapia (<Emphasis Type="Italic">Oreochromis niloticus</Emphasis>) Exposed to Dietary Pb |
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Authors: | Wei Dai Linglin Fu Huahua Du Chengguan Jin Zirong Xu |
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Institution: | (1) Key Laboratory for Molecular Animal Nutrition of Ministry of Education, Feed Science Institute, Zhejiang University, Hangzhou, 310029, People’s Republic of China;(2) Department of Fisheries Science, Tianjin Agricultural University, Tianjin, 300384, People’s Republic of China;(3) Department of Food Quality and Safety, Zhejiang Gongshang University, Hangzhou, 310018, People’s Republic of China;(4) Feed Science Institute, College of Animal Science, Zhejiang University (Huajiachi Campus), Qiutao North Road 164, Hangzhou, 310029, People’s Republic of China; |
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Abstract: | Tilapia (Oreochromis niloticus) were exposed to 0, 100, 400, and 800 μg/g concentrations of Pb in diet for 60 days, and changes in growth performance, metabolic
enzyme activities, and essential trace elements (Fe, Cu, and Zn) content in liver and kidney were investigated. Daily weight
gain, feed conversation ratio, and survival of tilapia were not significantly affected by dietary Pb. Alanine transaminase
(ALT), aspartate transaminase (AST), and lactate dehydrogenase (LDH) activities in liver and kidney were affected by dietary
Pb in a dissimilar way: Pb concentration-related decreases in ALT, AST, and LDH activities were observed in kidney, while
these enzyme activities in liver were stimulated in a Pb concentration-dependent manner. It was demonstrated that the inhibitory
effects of dietary Pb on alkaline phosphatase, Na, K-adenosine triphosphatase (ATPase), Ca, and Mg-ATPase activities in both
liver and kidney were Pb concentration-dependent. It was also indicated that the content of Fe, Cu, and Zn in liver and kidney
decreased with the increasing dietary Pb concentrations. The results suggested that long-term dietary Pb exposure could affect
metabolic enzyme activities and the content of Fe, Cu, and Zn in liver and kidney, whereas growth impairment was not observed
in tilapia. |
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Keywords: | Tilapia Dietary Pb Growth performance Trace elements Metabolic enzyme |
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