Effects of diet and feeding time on daily variations in plasma insulin, hepatic c-AMP and other metabolites in a teleost fish,Dicentrarchus labrax L.

González, J. C.; Zanuy, Silvia; Carrillo, Manuel

doi:10.1007/bf01874796

Cited by 32 publications

(20 citation statements)

References 24 publications

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“…Most information concerning changes in blood insulin concentrations in fish suggests that hormone changes are directly related to feeding times and the nature of the diet (e.g., Perez et al 1988, Sundby et al 1991). An example of this relationship is to be found in a recent study of Dicentrarchus labrux (Perez et al 1988) in which the peak plasma insulin levels were found in the second half of the photophase when the food provided was their natural prey species (Boops hoops); the pattern was reversed when the animals were fed artificial diets.…”

Section: Die1 Rhythm Of Feedingmentioning

confidence: 99%

Circadian rhythms and feeding time in fishes

1992

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SynopsisAlthough several studies have described effects of meal frequency and timing of meals on growth performance and body composition of different species of fishes, the mechanisms by which such variables influence the energy partitioning processes is not known. They may interact with the natural feeding rhythm of the fish, or with various behavioural and physiological parameters that exhibit 'circadian-like' patterns; however, in most cases, the endogenous character of such rhythms is not clear. The time of feeding, perse, can act as a Zeitgeber and override the effect of the light/dark alternation. Fish that are fed always at the same time of day show typical pre-feeding activity. Blood levels of some nutrients and hormones also show peaks or troughs at the time of feeding, but whether these are pre-feeding or post-prandial events is not clear. These results from fish are compared with similar studies with mammals. The existence and location of an endogenous multi-oscillator system is also discussed.

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Section: Die1 Rhythm Of Feedingmentioning

confidence: 99%

Circadian rhythms and feeding time in fishes

1992

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“…The relative importance of the feeding time and of the light/ dark alternation, as synchronizer of metabolic or endocrine parameters have been studied by several authors (Higgs and Eales 1977;Spieler et al 1978;Bry 1982;Perez et al 1988). However, in most of these studies, food was presented to the fish at times that did not necessarily coincide with their natural feeding rhythm (if indeed we can admit that such a rhythm is present in teleosts in general).…”

Section: Introductionmentioning

confidence: 97%

Effect of restricted access to demand-feeders on diurnal pattern of liver composition, plasma metabolites and hormone levels in Oncorhynchus mykiss

Boujard

Brett

Lin

et al. 1993

Fish Physiol Biochem

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In order to study the relative importance of the feeding time and the light/dark alternation, as synchronizers of metabolic and endocrine parameters, the hepatosomatic index, liver glycogen contents, plasma glucose, nonesterified fatty acids, cortisol, growth hormone and thyroid hormone concentrations between dawn -2h and dawn + 12h are described in immature rainbow trout (Oncorhynchus mykiss). Trout were held in groups of 30 individuals and given access to a demand-feeder for only 3h per day, between dawn and dawn + 3h for 6 aquaria, and between dawn + 4h and dawn + 7h for another series of 6 aquaria. There was a clear effect of the time of food access on most of the studied parameters, with a decreased amplitude of variation, or a decreased mean level, in the fish eating in the middle of the photophase, compared with the fish eating at dawn. Superimposed on this apparent depressive effect of phase shifting of food access, some parameters also show direct responses to the shift of eating time, with a post-prandial increase or decrease.

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“…The time of feeding has been shown to be of prime importance in the synchronization of such rhythms Laidley and Leatherland 1988;Perez et al 1988;Sundby et al 1991). However, in most of these studies, the fish were fed during the normal workday period, receiving only one meal per day, or even less.…”

Section: Introductionmentioning

confidence: 99%

Circadian pattern of hepatosomatic index, liver glycogen and lipid content, plasma non-esterified fatty acid, glucose, T3, T4, growth hormone and cortisol concentrations in Oncorhynchus mykiss held under different photoperiod regimes and fed using demand-feeders

Boujard

Leatherland

1992

Fish Physiol Biochem

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The circadian patterns of several tissue and plasma metabolites, and several plasma hormone concentrations are described in rainbow trout (Oncorhynchus mykiss) that were held in groups under three different photoperiod regimes, and given free access to a demand-feeder. Regardless of photoperiod regime, all the measured parameters showed significant diel rhythms that appeared to be synchronized by dawn; dawn was represented by the concomitant onset of both light and feeding. The diel increases in hepatic glycogen content, and plasma T4 and cortisol concentrations were in phase with the main period of feeding activity, whereas the peaks in plasma T3 and glucose concentrations that may also be triggered by feeding activity, were delayed by several hours. The peaks in hepatosomatic index, plasma non-esterified fatty acids and plasma growth hormone concentrations were 180° out of phase with the main period of feeding activity, and associated with periods of hypophagia and low activity.

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Effects of diet and feeding time on daily variations in plasma insulin, hepatic c-AMP and other metabolites in a teleost fish,Dicentrarchus labrax L.

Cited by 32 publications

References 24 publications

Circadian rhythms and feeding time in fishes

Circadian rhythms and feeding time in fishes

Effect of restricted access to demand-feeders on diurnal pattern of liver composition, plasma metabolites and hormone levels in Oncorhynchus mykiss

Circadian pattern of hepatosomatic index, liver glycogen and lipid content, plasma non-esterified fatty acid, glucose, T3, T4, growth hormone and cortisol concentrations in Oncorhynchus mykiss held under different photoperiod regimes and fed using demand-feeders

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