T. Boujard et al., Effect of past nutritional history and fasting on feed intake and growth in rainbow trout Oncorhynchus mykiss, AQU LIV RES, 13(3), 2000, pp. 129-137
Groups of juvenile rainbow trout were fed to satiation for 10 days after 1,
11 and 21 days of feed deprivation. These fish (initial body weight =20 +/
- 2 g) were previously fed at different feeding levels (0.5 or 1.5% initial
body weight, to satiation) with a high (20.4 kJ . g(-1)) or a low (16.2 kJ
.g(-1)) digestible energy diet content for 34 days. It is shown that past n
utritional history affected growth performance: duration of feed deprivatio
n has a major effect on intake and feed conversion efficiency; previous fee
ding level has an effect on intake; dietary energy content affected feed co
nversion efficiency. In addition, an attempt was made to identify some of t
he metabolic parameters that could be involved in the increase in growth pe
rformance during the 10-day feeding period (whole body and muscle protein a
nd lipid, plasma glucose, free fatty acids and triglycerids). Feed intake a
fter fasting does not appear to be driven by body composition but feed conv
ersion efficiency was correlated with the plasma glucose and free fatty aci
ds. (C) 2000 Ifremer/Cnrs/Inra/Ird/Cemagref/Editions scientifiques et medic
ales Elsevier SAS.