Rearing of sturgeon (Acipenser baeri Brandt) larvae: III. Nitrogen and energy metabolism and amino acid absorption |
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| Institution: | 1. Fish Nutrition Laboratory, I.N.R.A., St. Peé-sur-Nivelle, 64 310 Ascain, France;2. Department of Basic Fisheries Sciences, Academy of Agriculture and Technology, 10-957 Olsztyn-Kortowo, Poland;1. University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Vodnany, Czech Republic;2. Sino-Czech Joint Laboratory for Fish Conservation and Biotechnology, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, China;1. SLRC-Sea Lice Research Center, Institute of Marine Research, 5817 Bergen, Norway;2. SLRC-Sea Lice Research Center, Department of Biology, University of Bergen, Thormøhlensgt. 55, 5008 Bergen, Norway;1. Arizona Exotic Animal Hospital, 744 North Center Street, Suite 101, Mesa, AZ 85201, USA;2. American Association of Fish Veterinarians, 4580 Crackersport Road, Allentown, PA 18104, USA;3. World Aquatic Veterinary Medical Association, 132 Lichfield Road, Stafford, Staffordshire ST17 4LE, United Kingdom;4. Aquatic Veterinary Services of WNY, Williamsville, NY 14221, USA;1. Dept. of Earth, Environment and Life Sciences (DISTAV), University of Genoa, Italy;2. Dept. of Experimental Medicine (DIMES), University of Genoa, Italy;3. Dept. of Biomolecular Sciences (DISBM), University of Urbino, Italy;1. Irstea, EABX, Migratory Fish Team, 50 avenue de Verdun, 33612 Gazinet Cestas France;2. Irstea, HBAN, Fluvial Hydroecology Team, Anthony, France;1. University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Vodňany, Czech Republic;2. Department of Immunotechnology, Hus 406, Medicon Village, Lund University, 223 81, Lund, Sweden |
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| 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. |
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