The experiment was performed to examine the effect of Lactobacillus paracasei l61-27b (LP) isolated from Nile tilapia intestine on the growth rate, skin mucus and serum immune parameters and disease resistance. Fish (25.40 ± 0.33 g) were distributed into glass tank (150 litres tank⁻¹) at 20 fish tank⁻¹ and fed with different levels of dietary L. paracasei l61-27b: 0 (LP1), 10⁶ (LP2), 10⁷ (LP3), 10⁸ (LP4) and 10⁹ CFU mL⁻¹ (LP5) for 8 weeks. The results indicated that SGR, WG and FW significantly improved, while FCR significantly decreased, in fish fed LP supplemented. Dietary L. paracasei significantly increased SMLA and SMPA with the highest values recorded for fish in LP4 and LP5 groups. Similarly, SL, SP, ACH50, PI and RB were significantly stimulated in fish fed LP diet compared with fish fed control diet. Challenge study showed that in comparison with the control diet (20% survival), the survival rates of fish fed the L. paracasei were significantly (p < 0.05) higher; by 63.33% (LP2), 66.67% (LP3), 80.00% (LP4) and 83.33% for LP5. The relative per cent survival (RSP) was 54.17%, 58.33%, 75% and 79.17% in LP2, LP3, LP4 and LP5, respectively. In conclusion, the dietary inclusion of L. paracasei can be potentially used in Nile tilapia to improve its growth and health status.

中文翻译：

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尼罗罗非鱼喂养宿主相关益生菌（副干酪乳杆菌 l61-27b）的生长调节、皮肤粘液和血清免疫和抗病性

进行该实验以检查从尼罗罗非鱼肠中分离的副干酪乳杆菌l61-27b (LP)对生长速率、皮肤粘液和血清免疫参数以及抗病性的影响。将鱼（25.40 ± 0.33 g）分配到玻璃水箱（150 升水箱^-1）中的 20 个鱼缸^{-1 中，}并饲喂不同水平的日粮L。副干酪菌素 l61-27b：0 (LP1)、10 ⁶ (LP2)、10 ⁷ (LP3)、10 ⁸ (LP4) 和 10 ⁹  CFU mL ^-1 (LP5) 8 周。结果表明，在补充LP的鱼中，SGR、WG和FW显着提高，而FCR显着降低。饮食升。paracasei显着增加了 SMLA 和 SMPA，LP4 和 LP5 组的鱼记录的最高值。类似地，与喂食对照饮食的鱼相比，喂食 LP 饮食的鱼中的 SL、SP、ACH50、PI 和 RB 受到显着刺激。挑战研究表明，与对照饮食（20% 存活率）相比，喂食L的鱼的存活率。副干酪显着 ( p < 0.05) 更高；LP5 分别为 63.33% (LP2)、66.67% (LP3)、80.00% (LP4) 和 83.33%。LP2、LP3、LP4 和 LP5 的相对存活率 (RSP) 分别为 54.17%、58.33%、75% 和 79.17%。总之，饮食中包含L。副干酪 可潜在地用于尼罗罗非鱼以改善其生长和健康状况。