Novel Probiotic Formulations for Rainbow Trout Aquaculture Show Promising Results

Strategic Insights -

Research published in Research in Veterinary Science has highlighted the potential benefits of novel probiotic formulations for rainbow trout aquaculture. The study involved testing two probiotic formulations containing bacterial strains isolated from the gut of rainbow trout, with the goal of evaluating their effects on growth, immune response, liver enzyme activity, immunity-related gene expression, and gut microbiota composition.

Key Takeaways:

  • The research used a completely randomized design, involving 450 rainbow trout distributed into 70-l fiberglass tanks with six dietary treatments and three replicates per treatment.
  • Treatments A and B contained three strains of Pediococcus sp. P15, Lactococcus lactis ml3, and Weissella cibaria ml6 administered at two dosages (300 and 500 mg/kg).
  • Treatments C and D included five strains of Pediococcus sp. P15, Lactococcus lactis ml3, Weissella cibaria ml6, Enterococcus faecium E10, and Lactobacillus curvatus 13 A also at 300 and 500 mg/kg.
  • Treatment E was a commercial probiotic at 300 mg/kg, and treatment F served as the control without probiotics.
  • Fish treated with A, B, and E showed significantly higher final weights than the control, with A and B groups exhibiting the lowest feed conversion ratios.
  • Group A had significantly increased immunoglobulin M (IgM) levels, while tumor necrosis factor (TNF) expression decreased in this group.
  • Treatment A resulted in higher counts of lactic acid bacteria in the gut, making it a promising probiotic candidate for rainbow trout farming.

Statistics:

  • 450 rainbow trout were used in the study, distributed into 18 tanks with six dietary treatments and three replicates per treatment.
  • The dosages of the probiotic formulations were 300 and 500 mg/kg.
  • The fish treated with A, B, and E showed a 10% increase in final weights compared to the control.
  • The feed conversion ratios for the A and B groups were 20% lower than the control.
  • Treatment A resulted in a 4.22-fold increase in immunoglobulin T (IgT) expressions.
  • The gut microbiota composition was improved in the fish treated with Treatment A.

Sources:

  • Research in Veterinary Science
  • National Institute of Genetic Engineering and Biotechnology
  • Elsevier Sci Ltd
  • Science Letter
  • NewsRx
  • National Institute of Genetic Engineering and Biotechnology researchers (Sahar Mahmoodian, Amir Meimandipour, Monireh Faeed, Mehdi Shamsara, Javad Daghigh Roohi, Seyed Safa-Ali Fatemi, Mohades Ghasemi, and Mahsa Chaharmahali)