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Bioavailability of cadmium, zinc and...

Zhang, Li.

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Bioavailability of cadmium, zinc and selenium in two marine fish.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Bioavailability of cadmium, zinc and selenium in two marine fish./
Author:	Zhang, Li.
Description:	231 p.
Notes:	Adviser: Wen-Xiong Wang.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Agriculture, Fisheries and Aquaculture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292469
ISBN:	9780549352143

Bioavailability of cadmium, zinc and selenium in two marine fish.
Zhang, Li.

Bioavailability of cadmium, zinc and selenium in two marine fish. - 231 p.

Adviser: Wen-Xiong Wang.

Thesis (Ph.D.)--Hong Kong University of Science and Technology (Hong Kong), 2007.

It is valuable to study the bioavailability of trace metal in marine fish for their ecological and commercial importance. A series of experiments were conducted to investigate the trace metal (Cd, Zn, and Se) biokinetics in two marine fish Acanthopagrus schlegeli and Terapon jarbua. Waterborne and dietary metal uptake was examined under different conditions to investigate the effects of chemical and physiological factors on the bioavailability of metals to marine fish. The metal bioaccumulation in marine fish was predicted by applying the bioenergetic-based kinetic model. The different pattern of metal uptake by marine fish from freshwater fish was expressly concerned. Marine fish were found to take up waterborne metal through the gills and the gastrointestinal tracts and the latter one played predominant role. The uptake conformed to the first-order model over a wide range of ambient metal concentrations. The intestine had higher metal binding affinity and capacity than the gills. The surface-binding metal after short-term waterborne exposure was abundant. The waterborne uptake of trace metals in marine fish could be affected by many factors, including Cd and Zn pre-exposure, body size, water composition, and salinity. Ambient salinity influenced waterborne metal uptake, by changing both geochemical and physiological aspects, resulting in the major difference of metal uptake between marine and freshwater fish. The assimilation efficiency of dietary metals was observed to be influenced by the subcellular metal distribution in the preys and the feeding process of the fish. Body size influenced both the assimilation efficiency and ingestion rate significantly. The metal bioaccumulation was a gross result of waterborne and dietary metal uptake and metal efflux in marine fish, which was successfully predicted by the bioenergetic-based kinetic model. Dietary metal dominated the overall metal accumulation; efflux was the key process to the metal homeostasis in marine fish. Body size is also an important factor in metal bioaccumulation, and subsequently, metal trophic transfer in marine fish. The tissue specific and subcellular metal distributions revealed the strategies of marine fish handling trace metals.

ISBN: 9780549352143Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Bioavailability of cadmium, zinc and selenium in two marine fish.
LDR:03164nam 2200289 a 45 001 953837
005 20110621
008 110622s2007 ||||||||||||||||| ||eng d
020 $a 9780549352143
035 $a (UMI)AAI3292469
035 $a AAI3292469
040 $a UMI $c UMI
100 1 $a Zhang, Li. $3 729094
245 1 0 $a Bioavailability of cadmium, zinc and selenium in two marine fish.
300 $a 231 p.
500 $a Adviser: Wen-Xiong Wang.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7217.
502 $a Thesis (Ph.D.)--Hong Kong University of Science and Technology (Hong Kong), 2007.
520 $a It is valuable to study the bioavailability of trace metal in marine fish for their ecological and commercial importance. A series of experiments were conducted to investigate the trace metal (Cd, Zn, and Se) biokinetics in two marine fish Acanthopagrus schlegeli and Terapon jarbua. Waterborne and dietary metal uptake was examined under different conditions to investigate the effects of chemical and physiological factors on the bioavailability of metals to marine fish. The metal bioaccumulation in marine fish was predicted by applying the bioenergetic-based kinetic model. The different pattern of metal uptake by marine fish from freshwater fish was expressly concerned. Marine fish were found to take up waterborne metal through the gills and the gastrointestinal tracts and the latter one played predominant role. The uptake conformed to the first-order model over a wide range of ambient metal concentrations. The intestine had higher metal binding affinity and capacity than the gills. The surface-binding metal after short-term waterborne exposure was abundant. The waterborne uptake of trace metals in marine fish could be affected by many factors, including Cd and Zn pre-exposure, body size, water composition, and salinity. Ambient salinity influenced waterborne metal uptake, by changing both geochemical and physiological aspects, resulting in the major difference of metal uptake between marine and freshwater fish. The assimilation efficiency of dietary metals was observed to be influenced by the subcellular metal distribution in the preys and the feeding process of the fish. Body size influenced both the assimilation efficiency and ingestion rate significantly. The metal bioaccumulation was a gross result of waterborne and dietary metal uptake and metal efflux in marine fish, which was successfully predicted by the bioenergetic-based kinetic model. Dietary metal dominated the overall metal accumulation; efflux was the key process to the metal homeostasis in marine fish. Body size is also an important factor in metal bioaccumulation, and subsequently, metal trophic transfer in marine fish. The tissue specific and subcellular metal distributions revealed the strategies of marine fish handling trace metals.
590 $a School code: 1223.
650 4 $a Agriculture, Fisheries and Aquaculture. $3 1020913
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Environmental Sciences. $3 676987
690 $a 0433
690 $a 0768
690 $a 0792
710 2 $a Hong Kong University of Science and Technology (Hong Kong). $3 1022235
773 0 $t Dissertation Abstracts International $g 68-11B.
790 $a 1223
790 1 0 $a Wang, Wen-Xiong, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292469