Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria (Open Access publication).

Little is known about the genetic basis of residual feed intake (RFI) variation in fish, since this trait is highly sensitive to environmental influences, and feed intake of individuals is difficult to measure accurately. The purpose of this work was (i) to assess the genetic variability of RFI estimated by an X-ray technique and (ii) to develop predictive criteria for RFI. Two predictive criteria were tested: loss of body weight during feed deprivation and compensatory growth during re-feeding.

Group feeding behavior of brown trout is a correlated response to selection for growth shaped by the environment.

Group feeding pattern is a response correlated to selection for growth in brown trout. Previous results suggest that the feeding pattern of two lines (NL and SY), selected with the same process at two different fish farms, differ. This study addresses the following questions: (i) are the patterns differentially fixed by the selection process and if yes (ii) is this explained by the different genetic background of the lines? In a first experiment, we tested if the group feeding behavior can be inherited.

The evaluation of energy intake adjustments and preferences in juvenile rainbow trout fed increasing amounts of lipid.

This study aimed at a better understanding of the feed intake (FI) regulation in rainbow trout by dietary digestible energy (DE). The DE contents of the three diets (20.5, 23.