Probiotic bacteria may prevent haemorrhagic septicaemia by maturing intestinal host defences in Brazilian native surubins

Abstract

The farming of hybrid surubins in Brazil has been affected by bacterial diseases. To avoid this problem, the development of prophylactics such as probiotics has proved to be a promising tool against bacterial outbreaks. This study evaluated the dietary supplementation with lactic acid bacterium Weissella cibaria and its probiotic action in the intestinal tract focusing the hemato‐immunological parameters, histology and electron microscopy. A total of 96 fish were maintained in a recirculation system and divided into 12 tanks, two treatments (supplemented and unsupplemented fish) and six replicates. Fish were fed supplemented commercial diet with W. cibaria for a period of 45 days, and the unsupplemented fish were with commercial feed without probiotic. The numbers of red blood cells, thrombocytes and lymphocytes were higher in supplemented fish after 45 days (P < 0.05). The percentage of phagocytosis, the agglutination titre and the total immunoglobulin concentration were higher in fish fed probiotic. Fish fed supplemented diet presented increased length and width of the intestinal villi, the number of goblet cells and villi's perimeter. The probiotic W. cibaria was capable of colonizing and benefitting the surubins' gastrointestinal tracts, improving intestinal health and the hemato‐immunological parameters of fish.

Autochthonous probiotic as growth promoter and immunomodulator forAstyanax bimaculatuscultured in water recirculation system

“…The results of the present study corroborate with the results found by Jesus et al. (), that the probiotic may have induced an increase of the thrombocytes production, which can be interesting since these cells have important functions in fish immune system.…”

Autochthonous probiotic bacteria modulate intestinal microbiota of Pirarucu, Arapaima gigas

“…In the present study, no histomorphometric difference was observed in fish that received probiotic bacteria in diets when compared with fish that received the control diet. This outcome is contrary to that of Jesus et al (), who observed higher width, height, number of villi, and numbers of goblet cells in hybrid surubim ( Pseudoplatystoma reticulatum × P. corruscans ) after receiving the probiotic W. cibaria for 45 days. Other studies have reported higher measurements of gut metrics in fish that received probiotic bacteria, for example, Lee et al () in Anguilla japonica after 60 days of experiment and Abid et al () in Salmon salar after 63 days of feeding with probiotic bacteria.…”

Probiotic effects (Bacillus cereusandBacillus subtilis) on growth and physiological parameters of silver catfish (Rhamdia quelen)

“…The increased PER of fish fed diets containing probiotic bacteria was influenced by the capacity of these microorganisms of increasing intestinal absorption surface, stimulating and producing compounds that improve digestibility, nutrients retention, protein use and energetic targeting (El‐Haroun et al., 2006), generating higher rates of protein efficiency and increased absorption areas in the intestines, as observed in this study. In addition, Bacillus have the capacity of producing enzymes that increases mineral availability (Jesus et al., 2016) and reduces anti‐nutritional factors of plant ingredients of diets, maximizing nutrients use (Cheng et al., 2012).…”