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Studies on the nutrition of marine flatfish. The pyridoxine requirement of turbot (Scophthalmus maximus)

Published online by Cambridge University Press:  09 March 2007

J. W. Adron ,
D. Knox ,
C. B. Cowey  and
G. T. Ball
J. W. Adron
Affiliation:
Institute of Marine Biochemistry, St Fittick's Road, Aberdeen AB1 3RA
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
G. T. Ball
Affiliation:
Fisheries Laboratory, Breakwater Road, Port Erin, Isle of Man
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Abstract

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1. Diets containing graded levels of pyridoxine hydrochloride (to supply 0.26–30 mg pyridoxine/kg) were given to seven duplicate groups of turbot (Scophthalmus maximus) for 12 weeks and their growth rate was measured during this period.

2. Good growth was obtained on all treatments except those groups given less than 1.0 mg pyridoxine/kg diet. These fish grew normally until weeks 8–10 but thereafter their weight gain was significantly less than that for other treatments.

3. Measurements of aspartate aminotransferase (EC 2.6.1.1) in muscle and liver and of alanine aminotransferase (EC 2.6.1.2) in liver of the turbot showed that the activities of these enzymes increased with increasing dietary pyridoxine intake up to a level of 2.5 mg pyridoxine/kg. The activities of these enzymes were not further enhanced by additional dietary pyridoxine.

4. Percentage stimulation of these enzymes by pre-incubation of extracts with pyridoxal phosphate was minimal with those groups of turbot given 2.5 mg pyridoxine/kg diet or more.

5. It is concluded that the dietary requirement of turbot for vitamin B6 can be safely met with a diet containing between 1.0 and 2.5 mg pyridoxine/kg.

6. An eighth group of turbot given the pyridoxine antagonist 4-deoxypyridoxine hydrochloride (20 mg/kg) showed retarded growth after 2 weeks, together with a high mortality rate.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 40 , Issue 2 , September 1978 , pp. 261 - 268
Copyright
Copyright © The Nutrition Society 1978

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