Effects of host‐associated probioticBacillus altitudinisB61‐34b on growth performance, immune response and disease resistance of Nile tilapia (Oreochromis niloticus) raised under biofloc system

Abstract

This investigation was performed to assess the influences of the host-associated probiotic Bacillus altitudinis B61-34b (BAA) on growth, immune response and disease resistance to Streptococcus agalactiae in Nile tilapia (Oreochromis niloticus). Fish (25.50 ± 0.52 g fish −1 ) were distributed into 15 aquaria (150 litres tank −1 ) at density of 20 fish tank −1 . The fish were fed basal diets with BAA inclusions in different concentrations: 0 (BAA1-Control), 10 6 (BAA2), 10 7 (BAA3), 10 8 (BAA4) and 10 9 (BAA5) CFU ml −1 for 8 weeks. A completely randomized design with three replications was used. The results indicated that BAA administration generated greater (p < 0.05) skin mucus and peroxidase activities compared to the control, with maximum levels recorded in BAA4 and BAA5. Higher serum immunities, such as serum lysozyme, serum peroxidase, complement, phagocytosis and respiratory burst activities were observed in the BAA4 and BAA5 dietary groups compared to the control, BAA1, BAA2 and BAA3 diets. The relative percentage of survival, growth performance and FCR were also significantly higher (p < 0.05) in the BAA4 and BAA5 groups. In conclusion, dietary supplementation of B. altitudinis at 10 8 CFU ml −1 can improve Nile tilapia's growth performance, skin mucus and serum immunities, and disease resistance.

The effects of probiotics‐supplemented diets on Asian sea bass ( Lates calcarifer ): Growth performance, microbial flora, digestive enzymes activity, serum biochemical and non‐specific immune indices

“…The findings of the present research displayed that growth indices were improved in all groups, particularly in the Diet 2 group. Similarly to our findings, several studies reported that the use of different probiotics has positive effects on growth performances in different aquatic species (Abdel-Aziz et al, 2020;Lee et al, 2021;Sayed Hassani et al, 2020;Sutriana et al, 2021;Tarkhani et al, 2020;Van Doan, Lumsangkul, Jaturasitha, et al, 2021;Van Doan, Lumsangkul, Ruangwong, et al, 2021;Zhang et al, 2022). Probiotics by increasing the ability to absorb minerals such as calcium, improving the intestinal microbial balance (Aljewicz et al, 2014;El-Saadony et al, 2021;Hoseinifar et al, 2020;Nath et al, 2019;Van Doan et al, 2019), production of digestive enzymes, improving food efficiency, reduction of anti-nutritional factors (Assan et al, 2022) and production of short- According to our findings, fish fed with all probiotic groups for 60 days had higher amounts of intestinal ɑ-amylase, protease and lipase.…”

Biofloc Technology (BFT) in Aquaculture: What Goes Right, What Goes Wrong? A Scientific-Based Snapshot

“…Studies have shown that the use of probiotics in biofloc systems can enhance the production and health of aquatic animals [ 73 , 74 ]. For example, the use of Bacillus sp.…”

“…For example, the use of Bacillus sp. in BFT systems has been shown to improve the growth performance and disease resistance of Nile tilapia [ 74 , 75 ]. Similarly, the use of Lactobacillus plantarum in biofloc systems has been shown to improve the growth performance and survival rate of Pacific white shrimp [ 76 ].…”