Effect of feeding time on postprandial nitrogen excretion and energy expenditure in rainbow trout
Identifieur interne : 001865 ( Main/Merge ); précédent : 001864; suivant : 001866Effect of feeding time on postprandial nitrogen excretion and energy expenditure in rainbow trout
Auteurs : A. Gélineu [France] ; F. Médale [France] ; T. Boujard [France]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 1998-04.
English descriptors
Abstract
The effect of feeding time (dawn or midnight) on nitrogen excretion and energy expenditure was studied in immature rainbow trout using measurements of respiratory gas exchange. Fish (mean individual weight 70 g) were maintained indoors under natural photoperiod and fed by hand (commercial food pellets) at a rate of 1% weight/day−1. Rates of ammonia and CO2 excretion and O2 uptake were measured every hour. Ammonia excretion increased immediately after feeding in fish fed at midnight, and 2h after feeding in fish fed at dawn. Ammonia excretion and energy supply from protein catabolism, were higher in trout fed at midnight than in those fed at dawn, while total energy expenditure was the same in both groups. The results suggested that trout fed in phase with their natural feeding rhythm use dietary protein more efficiently for growth than do trout fed out of phase with the natural rhythm.
Url:
DOI: 10.1111/j.1095-8649.1998.tb00810.x
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Gélineu</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Station ďHydrobiologie, Unité mixte INRA/IFREMER de Nutrition des Poissons, B.P. 3, 64310 Saint‐Pée‐sur‐Nivelle</wicri:regionArea><placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region><region type="old region" nuts="2">Aquitaine</region><settlement type="city">Saint‐Pée‐sur‐Nivelle</settlement></placeName></affiliation></author><author><name sortKey="Medale, F" sort="Medale, F" uniqKey="Medale F" first="F." last="Médale">F. 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Fish (mean individual weight 70 g) were maintained indoors under natural photoperiod and fed by hand (commercial food pellets) at a rate of 1% weight/day−1. Rates of ammonia and CO2 excretion and O2 uptake were measured every hour. Ammonia excretion increased immediately after feeding in fish fed at midnight, and 2h after feeding in fish fed at dawn. Ammonia excretion and energy supply from protein catabolism, were higher in trout fed at midnight than in those fed at dawn, while total energy expenditure was the same in both groups. The results suggested that trout fed in phase with their natural feeding rhythm use dietary protein more efficiently for growth than do trout fed out of phase with the natural rhythm.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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