ISSN:
1573-5168
Keywords:
digestive tract tissue
;
distribution of zinc
;
grass carp
;
metallothionein
;
release of zinc
;
subcellular
;
tilapia
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract High zinc diet of 2000 mg kg−1 was fed to common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idellus) and tilapia (Oreochromis aureus) for 8 weeks to compare the accumulation of Zn in fish. It was found that accumulation of zinc from diet by grass carp and tilapia was low when compared to common carp. The largest difference occurred in digestive tract tissue. The digestive tract tissue of common carp had a large pool of stored zinc, the mean ‘storable capacity’ is about 1500 μg Zn g−1 fresh tissue, and the time needed to saturate the tissue when feeding 2000 mg Zn kg−1 diet is about 8 weeks. The accumulated Zn in the digestive tract tissue of common carp was released when the dietary Zn was reduced to normal level (50 mg kg−1) or deficient level (4 mg kg−1) for 4 weeks. Subcellular fractionation results indicate that Zn accumulated in digestive tract tissue of common carp was accumulated mainly in the nuclei/cell debris fraction. Exposure to a high Zn diet induced some metallothionein-like substance in the digestive tract tissue and the hepatopancreas of common carp, but the amount was very low when compared with the amount of Zn accumulated in the nuclei/cell debris fraction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007770431819
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