Dietary lipid sources affect freshwater catfish jundiá, Rhamdia quelen, survival, when challenged with Aeromonas hydrophila - doi: 10.4025/actascianimsci.v35i4.19617

Resumo

The immune modulatory activity of diet long chain polyunsaturated fatty acids in fish has
been previously demonstrated, although results for freshwater species are controversial. This study
evaluates the effect of different dietary lipids on freshwater catfish jundiá, Rhamdia quelen, survival and its
non-specific response (phagocytosis) after being inoculated with the pathogen Aeromonas hydrophila. Five
diets were offered to jundiá fingerlings during 150 days prior to challenge: cod liver oil (FO), sunflower oil
(SO), linseed oil (LO), canola oil (CO) and coconut oil (CNO). Accumulated mortality was significantly
lower in fish fed FO and CNO diets and higher in fish fed LO. In spite of the highest values observed for
phagocytotic activity in CNO-fed fish (50.0 + 12.7%) and in FO-fed fish (45.0 + 10.5%) when compared
to those fed other diets, no significant differences in phagocytosis were reported. Results show the
relevance of a balanced dietary lipid source with adequate concentrations of n-3 and n-6 series of fatty acids
to prevent mortality after pathogen challenge.ent mortality after pathogen challenge