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The effect of low dietary manganese intake on rainbow trout (Salmo gairdneri)

Published online by Cambridge University Press:  09 March 2007

D. Knox ,
C. B. Cowey  and
J. W. Adron
D. Knox
Affiliation:
Institute of Marine Biochemistry, St Fittick's Road, Aberdeen AB1 3RA
C. B. Cowey
Affiliation:
Institute of Marine Biochemistry, St Fittick's Road, Aberdeen AB1 3RA
J. W. Adron
Affiliation:
Institute of Marine Biochemistry, St Fittick's Road, Aberdeen AB1 3RA
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Abstract

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1. Rainbow trout (Salmo gairdneri) of mean initial weight 15 g were given either a low-manganese or control diet containing 1·3 and 33 mg Mn/kg dry diet respectively.

2. Weight gains over a 24-week feeding period were the same for both groups of trout.

3. Hepatosomalic index, blood packed cell volume and haemoglobin concentration, plasma protein and the activities of aspartic aminotransferase(EC 2.6.1.1)and alanine aminotransferase(EC 2.6.1.2) were unaffected by dietary Mn intake.

4. Plasma potassium and iron levels were increased in the trout given the low-Mn diet.

5. The hepatic levels of magnesium, sodium, K, zinc, copper, Mn and phosphorus were significantly reduced in the fish given the low-Mn diet.

6. In those trout given the low-Mn diet the levels of Mn and calcium in the vertebral ash were significantly reduced.

7. The hepatic activity of Cu-Zn superoxide dismutase (EC 1.15.1.1; Cu–ZnSOD) and of Mn superoxide dismutase (EC 1.15.1.1; MnSOD) in cardiac muscle and liver was reduced in the group of trout given the low-Mn diet. The fall in Cu–ZnSOD and MnSOD activities coincided with reduced tissue levels of their respective metal components.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 46 , Issue 3 , November 1981 , pp. 495 - 501
Copyright
Copyright © The Nutrition Society 1981

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