Rearing of sturgeon ( Acipenser baeri Brandt) larvae
Identifieur interne : 002098 ( Main/Merge ); précédent : 002097; suivant : 002099Rearing of sturgeon ( Acipenser baeri Brandt) larvae
Auteurs : B. Fauconneau [France] ; P. Aguirre [France] ; K. Dabrowski [France] ; S. J. Kaushik [France]Source :
- Aquaculture [ 0044-8486 ] ; 1986.
Abstract
Protein metabolism was analysed in sturgeon larvae fed either on a natural food (Tubifex — diet 1, control) or on various artificial foods: mixed liver- and yeast-based diet (2), salmon starter diet (3) and casein-gelatin-based diet (4) (experiment I), or starved during 24 h (experiment II). Two pathways of protein metabolism, viz, protein synthesis and arginine oxidation, were measured in whole fish after immersion in a solution containing L-14C(U)-arginine.During short-term fasting, there was a large decrease in protein synthesis (from 220 to 10% day within 24 h) and only a small increase in arginine oxidation (from 1.9 to 4.7 μmoles of arginine oxidized per g body weight/day).In fish fed on an artificial diet, an improvement in performance (increasing from diet 4 to diet 2), assessed by growth and survival, led to an increase in protein synthesis and in the oxidation of arginine. Thus, the overall amino acid metabolism was stimulated.Fish fed on natural food showed a better efficiency of protein metabolism, associated with a lower rate of protein synthesis and a lower rate of arginine oxidation, than fish fed on artificial food.These changes in whole fish protein synthesis could be linked both to a change in protein deposition rate in muscle and to a change in protein turnover rate of active tissues such as liver, pancreas and digestive tract in response to different feeding conditions (namely feeding frequency and diet composition).
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DOI: 10.1016/0044-8486(86)90133-X
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Two pathways of protein metabolism, viz, protein synthesis and arginine oxidation, were measured in whole fish after immersion in a solution containing L-14C(U)-arginine.During short-term fasting, there was a large decrease in protein synthesis (from 220 to 10% day within 24 h) and only a small increase in arginine oxidation (from 1.9 to 4.7 μmoles of arginine oxidized per g body weight/day).In fish fed on an artificial diet, an improvement in performance (increasing from diet 4 to diet 2), assessed by growth and survival, led to an increase in protein synthesis and in the oxidation of arginine. Thus, the overall amino acid metabolism was stimulated.Fish fed on natural food showed a better efficiency of protein metabolism, associated with a lower rate of protein synthesis and a lower rate of arginine oxidation, than fish fed on artificial food.These changes in whole fish protein synthesis could be linked both to a change in protein deposition rate in muscle and to a change in protein turnover rate of active tissues such as liver, pancreas and digestive tract in response to different feeding conditions (namely feeding frequency and diet composition).</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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