Modulação da resposta imune por frutooligossacarídeo em juvenis de pacu (Piaractus mesopotamicus)

Abstract

Intensifying aquaculture production allows the development of stressful conditions, weakening the immune system of fish. An alternative to the use of chemical and natural substances is immunostimulants. Thus, a modulation of the immune response and the growth of pacu juveniles (P. mesopotamicus) fed with fructooligosaccharides were objectified. One hundred and five animals (49.25 ± 13.77g) were randomly distributed in 12 aquariums (60L; 10 fish / box) and fed for sixty days with feed (PB 32%) containing fructooligosaccharide (FOS) (0.0%, 0.2% and 0.4%) in a completely randomized design (n = 4). At the end of the experimental period, fish fed with 0.2% of FOS showed a higher total count of erythrocytes, leucocytes and total thrombocytes, as well as influence on mean corpuscular volume (MCV) and corpuscular mean hemoglobin (MHC) (P ˂ 0 , 05). Although it has altered these parameters, the fructooligosaccharide had no effect on the leukocyte activity, being considered a modulator of the immune response under the conditions tested.