Adaptive capacities from survival to stress responses of two isogenic lines of rainbow trout fed a plant-based diet.
The composition of feed for farmed salmonids has strongly evolved during the last decades due to the substitution of fishery-derived fish oil and fishmeal by ingredients of plant origin. Little information is available regarding the effects of this transition on adaptive capacities in fish. Two rainbow trout isogenic lines, known for their divergent ability to grow on a plant-based diet (PBD), were fed for seven months from first feeding either a fully PBD or a control marine-resources diet and were compared for their growing and survival capacities over time and their behavioral and stress responses at similar sizes but different ages. Although fish displayed similar appetitive behaviour, the two lines were highly affected by the PBD translated in decreased growth and apathetic behaviour, but also stronger stress responses displayed by stronger cortisol increases and more stress-related behaviour when isolated. The two lines were found to be similarly sensitive to a PBD for the assessed stress-related parameters, but one line displayed a lower survival during the early rearing period. Overall, these results suggest that a PBD supplied to fish from the alevin stage has strong effects on physiological and behavioural parameters, with possible impairment of fish welfare, but also genome-dependent survival.
INRA, UR1037, Fish Physiology and Genomics, 35042 Rennes, France.
B
B
Sadoul
INRA, UR1037, Fish Physiology and Genomics, 35042 Rennes, France.
A
A
Foucard
INRA, UR1037, Fish Physiology and Genomics, 35042 Rennes, France.
C
C
Valotaire
INRA, UE937 Pisciculture expérimentale des Monts d'Arrée, 29450 Sizun, France.
L
L
Labbé
INRA, UE937 Pisciculture expérimentale des Monts d'Arrée, 29450 Sizun, France.
L
L
Goardon
INRA, UE937 Pisciculture expérimentale des Monts d'Arrée, 29450 Sizun, France.
J M
JM
LeCalvez
INRA, UR1419 Nutrition Métabolisme Aquaculture, 64310 St-Pée-sur-Nivelle, France.
F
F
Médale
INRA, UMR1313 Génétique Animale et Biologie Intégrative, 78352 Jouy-en-Josas, France.
E
E
Quillet
INRA, UMR1313 Génétique Animale et Biologie Intégrative, 78352 Jouy-en-Josas, France.
M
M
Dupont-Nivet
INRA, UR1419 Nutrition Métabolisme Aquaculture, 64310 St-Pée-sur-Nivelle, France.
I
I
Geurden
INRA, UR1037, Fish Physiology and Genomics, 35042 Rennes, France.
P
P
Prunet
INRA, UR1037, Fish Physiology and Genomics, 35042 Rennes, France.
V
V
Colson
D000223:Adaptation, Psychological; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D017756:Aquaculture / Q000379:methods*; D004032:Diet; D005395:Fish Oils / Q000008:administration & dosage; D005398:Fisheries; D017686:Oncorhynchus mykiss / Q000254:growth & development* / Q000502:physiology; D010944:Plants; D013312:Stress, Physiological
D005395:Fish Oils