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

Abstract

<p>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, <em>Rhamdia quelen</em>, survival and its non-specific response (phagocytosis) after being inoculated with the pathogen <em>Aeromonas hydrophila</em>. 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.</p> <p class="akeyword"> </p><p> </p

Sodium salt medium-chain fatty acids andBacillus-based probiotic strategies to improve growth and intestinal health of gilthead sea bream (Sparus aurata)

“…Nonetheless, the lack of any prototypical pro-inflammatory signal, such as tnf α or il1 β up-regulation, suggests that these cells have been recruited and reside inactive in the intestinal submucosa as a kind of surveillance machinery ready to be activated in case of threat. Although in the present study no challenge was performed to evaluate the readiness of the immune system of GSB upon pathogen exposure, there is evidence that coconut oil supplementation can increase survival of catfish upon Aeromonas hydrophila challenge ( Vargas et al, 2013 ).…”

Dietary Oil Sources on the Innate Immunity and Resistance of Nile Tilapia, Oreochromis niloticus, to Streptococcus agalactiae Challenge

“…Intake of high levels of dietary ω‐3 PUFA also reduces immune responses in humans (Soyland et al ) and rats (Jolly et al ). Literature supports that not only total levels of essential fatty acids, but also the ratio between them should be taken into account to prevent the mortality and ensure the fish health and welfare (Sargent et al ; Montero and Izquierdo ; Vargas et al ).…”