Rearing of sturgeon ( Acipenser baeri Brandt) larvae
Identifieur interne : 001E80 ( Main/Curation ); précédent : 001E79; suivant : 001E81Rearing of sturgeon ( Acipenser baeri Brandt) larvae
Auteurs : K. Dabrowski [Pologne] ; S. J. Kaushik [France] ; B. Fauconneau [France]Source :
- Aquaculture [ 0044-8486 ] ; 1987.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Azote, Pisciculture.
English descriptors
- KwdEn :
Abstract
Sturgeon juveniles offered either natural food (Tubifex sp.) or various dry foods were used to analyse ammonia excretion and oxygen consumption. The control groups were fish of the same nutritional history but which were fasting during the 24-h metabolic studies. An increase in oxygen consumption and ammonia excretion was visible only in the groups offered live food and good quality dry food. Metabolic losses, expressed as a percentage of the meal intake, varied from 1.3 to 18.0% for nitrogen and from 7.0 to 13.5% for energy. Sturgeon offered a semi-purified, caseingelatin diet had a high increase in postprandial ammonia excretion, with only a negligible increase in oxygen consumption. The protein utilization in fasting fish, calculated on the basis of AQ (ammonia loss/oxygen uptake) values showed some diurnal variation and the peak values were not identical in all of the groups. The preliminary energy and nitrogen budgets suggested that protein from a live food source is catabolized to a higher degree than protein from larval dry diets, whereas the higher postprandial energy loss in the latter case advocates fat and carbohydrate utilization. The amino acid absorption was excellent when live food was offered. However, the fish performed worse on the semi-purified diet, absorbing only 98% of the amino acids. The limitations of the utilization of the casein-gelatin diet for growth are not at the digestive and absorptive levels; this diet provokes an immense amino acid degradation. In line with our previous results for other larvae, metabolic studies also proved to be very useful criteria in the evaluation of compound diets for sturgeon larvae.
Url:
DOI: 10.1016/0044-8486(87)90268-7
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<front><div type="abstract" xml:lang="en">Sturgeon juveniles offered either natural food (Tubifex sp.) or various dry foods were used to analyse ammonia excretion and oxygen consumption. The control groups were fish of the same nutritional history but which were fasting during the 24-h metabolic studies. An increase in oxygen consumption and ammonia excretion was visible only in the groups offered live food and good quality dry food. Metabolic losses, expressed as a percentage of the meal intake, varied from 1.3 to 18.0% for nitrogen and from 7.0 to 13.5% for energy. Sturgeon offered a semi-purified, caseingelatin diet had a high increase in postprandial ammonia excretion, with only a negligible increase in oxygen consumption. The protein utilization in fasting fish, calculated on the basis of AQ (ammonia loss/oxygen uptake) values showed some diurnal variation and the peak values were not identical in all of the groups. The preliminary energy and nitrogen budgets suggested that protein from a live food source is catabolized to a higher degree than protein from larval dry diets, whereas the higher postprandial energy loss in the latter case advocates fat and carbohydrate utilization. The amino acid absorption was excellent when live food was offered. However, the fish performed worse on the semi-purified diet, absorbing only 98% of the amino acids. The limitations of the utilization of the casein-gelatin diet for growth are not at the digestive and absorptive levels; this diet provokes an immense amino acid degradation. In line with our previous results for other larvae, metabolic studies also proved to be very useful criteria in the evaluation of compound diets for sturgeon larvae.</div>
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<front><div type="abstract" xml:lang="en">Sturgeon juveniles offered either natural food (Tubifex sp.) or various dry foods were used to analyse ammonia excretion and oxygen consumption. The control groups were fish of the same nutritional history but which were fasting during the 24-h metabolic studies. An increase in oxygen consumption and ammonia excretion was visible only in the groups offered live food and good quality dry food. Metabolic losses, expressed as a percentage of the meal intake, varied from 1.3 to 18.0% for nitrogen and from 7.0 to 13.5% for energy. Sturgeon offered a semi-purified, caseingelatin diet had a high increase in postprandial ammonia excretion, with only a negligible increase in oxygen consumption. The protein utilization in fasting fish, calculated on the basis of AQ (ammonia loss/oxygen uptake) values showed some diurnal variation and the peak values were not identical in all of the groups. The preliminary energy and nitrogen budgets suggested that protein from a live food source is catabolized to a higher degree than protein from larval dry diets, whereas the higher postprandial energy loss in the latter case advocates fat and carbohydrate utilization. The amino acid absorption was excellent when live food was offered. However, the fish performed worse on the semi-purified diet, absorbing only 98% of the amino acids. The limitations of the utilization of the casein-gelatin diet for growth are not at the digestive and absorptive levels; this diet provokes an immense amino acid degradation. In line with our previous results for other larvae, metabolic studies also proved to be very useful criteria in the evaluation of compound diets for sturgeon larvae.</div>
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