Variability in appetite of turbot, Scophthalmus maximus under intensive rearing conditions: the role of environmental factors

Mallekh, R.; Lagardère, Jean-Paul; Anras, M.L. Bégout; Lafaye, Jean-Yves

doi:10.1016/s0044-8486(98)00244-0

Cited by 42 publications

(26 citation statements)

References 32 publications

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“…The food intake did not vary between the populations and was related mainly to temperature in line with earlier studies (Mallekh et al, 1998). However, the Norwegian population showed higher overall food conversion efficiency compared with the two other populations (Table II).…”

Section: Discussionsupporting

confidence: 89%

Countergradient variation in growth and food conversion efficiency of juvenile turbot

Imsland¹,

Foss²,

Névdal³

et al. 2000

Journal of Fish Biology

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Growth performance of a high latitude (Norway) population of juvenile turbot Scophthalmus maximus was superior to that of two other lower latitude populations (Scotland, France) especially at 18 and 22 C. Overall these results lend some support to the hypothesis of countergradient variation in growth. The Norwegian population had the highest estimated temperature optimum for growth (T opt.G ..) (23·0 0·9 C) and food conversion efficiency (T opt.Ec ) (17·5 0·3), followed by the French (T opt.G , 21·1 1·0; T opt.Ec 16·7 0·1) population, whereas the Scottish population had the lowest optimum (T opt.G , 19·6 0·6; T opt.Ec , 16·5 0·1 C). These results have two major implications: firstly, for turbot culture, particularly in selection work focusing on growth performance; secondly, if countergradient variation in growth performance takes place within a species one cannot assume automatically that one set of physiological parameters, in this case growth-related parameters, is satisfactory to predict growth for a species throughout its range as different populations might show a difference in response towards different physiological parameters. 2000 The Fisheries Society of the British Isles

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Section: Discussionsupporting

confidence: 89%

Countergradient variation in growth and food conversion efficiency of juvenile turbot

Imsland¹,

Foss²,

Névdal³

et al. 2000

Journal of Fish Biology

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“…This corroborates similar observations made on European sea bass Dicentrarchus labrax (Lefrançois 2001) and turbot Scophthalmus maximus (Mallekh & Lagardère 2002). In the latter species, neither food intake (Mallekh et al 1998) nor growth (Person-Le Ruyet et al 2001) was improved when fish were raised under hyperoxic conditions. In rainbow trout Oncorhynchus mykiss, the maximal oxygen consumption measured in forced-swum fish and the critical swimming speed (U crit ) are not raised by hyperoxia either (Duthie & Hughes 1987).…”

Section: Effect Of Oxygensupporting

confidence: 88%

Influence of ambient oxygenation and temperature on metabolic scope and scope for heart rate in the common sole Solea solea

Lefrançois¹,

Claireaux²

2003

Mar. Ecol. Prog. Ser.

133

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“…Forbes (2003) found for terrestrial farm animals also that the daily intake fluctuations were (weakly) organized in relation to time but concluded that varying intake is merely a means of detecting and maintaining an optimal intake. For turbot in a practical farm situation, Mallekh et al (1998) found that environmental variation could explain only 26% of day-to-day variation in feed intake, while on a longer time scale, using fortnightly means, 86% of the variation could be explained. In a later study these authors showed that for turbot on this longer time scale feed intake was linearly related to metabolic scope (Mallekh and Lagardere 2002).…”

Section: Discussionmentioning

confidence: 95%

Gastrointestinal and metabolic effects of feeding schedule on voluntary feed intake and growth of European eel, Anguilla anguilla

et al. 2007

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Gastrointestinal and metabolic influences on short-and medium-term control of voluntary feed intake of European eel were investigated for groups of fish fed at different feeding schedules: 1 meal 2 days À1 , 1 meal day À1 , 2 meals day À1 and continuous feeding for 12 h and 24 h daily. For fish fed daily, the feeding schedule had no effect on feed intake, metabolism, growth, size variation and body composition. Only fish fed once every 2 days could not completely compensate by increasing their average meal size and showed a reduced feed intake, metabolism and growth. Stomach capacity did not limit meal size and feed intake as large differences in appetite were found for eels with empty stomachs. Feed intake was related to metabolism as the levels of O 2 consumption and NH 4 excretion just before the meal were correlated to average meal size, suggesting that rate (and duration) of metabolism is sensed and is providing information about the metabolic consequences of feed intake and feed processing. Meal size is based on the (expected) scope for metabolism and eels seem to strive to an average daily feed intake, associated with their developmental state (growth potential). Plasticity in this feed intake behaviour, expressed by individual variation in feed intake and day-to-day fluctuations in individual and group intake, is regarded as adaptive on different time scales.Keywords Anguilla anguilla Á Feeding schedule Á Gastrointestinal tract Á Individual variation Á Oxygen consumption Á Voluntary feed intake Abbreviations ABW g Geometric average body weight over the experimental period BUE Branchial and urinary energy loss BW fFinal body weight

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Variability in appetite of turbot, Scophthalmus maximus under intensive rearing conditions: the role of environmental factors

Cited by 42 publications

References 32 publications

Countergradient variation in growth and food conversion efficiency of juvenile turbot

Countergradient variation in growth and food conversion efficiency of juvenile turbot

Influence of ambient oxygenation and temperature on metabolic scope and scope for heart rate in the common sole Solea solea

Gastrointestinal and metabolic effects of feeding schedule on voluntary feed intake and growth of European eel, Anguilla anguilla

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