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Titolo:
Energetics in Atlantic salmon (Salmo salar L.) parr fed elevated dietary cadmium
Autore:
Berntssen, MHG; Lundebye, AK;
Indirizzi:
Directorate Fisheries, Inst Nutr, N-5002 Bergen, Norway Directorate Fisheries Bergen Norway N-5002 t Nutr, N-5002 Bergen, Norway
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
fascicolo: 3, volume: 128, anno: 2001,
pagine: 311 - 323
SICI:
1532-0456(200103)128:3<311:EIAS(S>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT ONCORHYNCHUS-MYKISS; COD GADUS-MORHUA; RAINBOW-TROUT; BIOCHEMICAL-COMPOSITION; SUBLETHAL EXPOSURE; COPPER EXPOSURE; GROWTH; METALLOTHIONEIN; ABSORPTION; PROTEIN;
Keywords:
nutrient composition; dietary cadmium toxicity; digestibility; energy storage; growth; Salmo salar;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Berntssen, MHG Directorate Fisheries, Inst Nutr, POB 185, N-5002 Bergen, Norway Directorate Fisheries POB 185 Bergen Norway N-5002 Norway
Citazione:
M.H.G. Berntssen e A.K. Lundebye, "Energetics in Atlantic salmon (Salmo salar L.) parr fed elevated dietary cadmium", COMP BIOC C, 128(3), 2001, pp. 311-323

Abstract

Atlantic salmon (Salmo salar L.) parr were reared for 4 months on experimental diets supplemented with Cd (0.5, 5, 25, 125, or 250 mg Cd kg(-1)) to assess the long-term energetic changes based on the digestibility and biochemical deposition of the major dietary nutrients and to evaluate a maximum tolerable dietary toxicant concentration. Growth did not differ significantly (P > 0.05) from the control groups. The biochemical composition of the carcass, but not the viscera, was negatively affected by dietary Cd exposure. The significant decreases in protein, lipid, and glycogen concentrations in the carcass (P < 0.05, 25 mg kg(-1) compared to control groups) caused a reduction in calculated whole-body energy content in fish fed 125 mg kg(-1)compared to control groups. This reduction in calculated whole-body energycontent was explained by a concurrent significant disturbance to the gastrointestinal function (measured as reduced digestibility). Only at the highest dietary Cd exposure (250 mg kg(-1)), increased metabolic costs to cope with Cd toxicity was thought to contribute significantly to the reduction incarcass energy content. The most important factor effecting calculated total energetics was nutrient digestibility. Based on the logarithmic effective median concentration for reduced calculated energy digestibility (dietaryCd concentration corresponding to 50% reduction, EC50), the maximum tolerable dietary Cd concentration is 11 mg kg(-1) diet. <(c)> 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/20 alle ore 20:53:33