Lactobacillus spp. as probiotics for prevention and treatment of enteritis in the lined seahorse (Hippocampus erectus) juveniles

文献类型： 外文期刊

第一作者： Lin, Tingting

作者： Lin, Tingting;Liu, Xin;Xiao, Dongxue;Zhang, Dong;Cai, Yishan;Cai, Yishan;Zhu, Xialian

作者机构：

关键词： Probiotics; Lactobacillus; Hippocampus erectus; Enteritis; Disease prevention

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2019 年 503 卷

页码：

收录情况： SCI

摘要： With the aim of using probiotics to control the enteritis in the lined seahorse Hippocampus erectus, three experiments were carried out. In the first experiment, difference in intestinal microbiota between the healthy and enteritis diseased juveniles was investigated to screen the targeted probiotics to enteritis. The results showed that diseased juveniles were heavily deficient in intestinal Lactobacillus spp. compared with healthy ones. Therefore, three Lactobacillus species of L. acidophilus, L. plantarum and L. rhamnosus were employed in the second experiment to test the preventative effect of Lactobacillus spp. on enteritis. The Lactobacillus spp. was daily administrated to the rearing water containing juveniles and live food (copepods) for 45 days. The survival, growth and intestinal parameters, including Vibrio and lactic acid bacteria, immunocytokines (tumour necrosis factor (TNF)-alpha, interleukin (IL)-1 beta, interferon (IFN)-gamma and lysozyme (LZM)), and epithelial ultrastructure were analysed on days 15, 30 and 45. The results showed that in the administrated groups, particularly administrated with L. plantarum, the survival and growth, together with the abundance of intestinal lactic acid bacteria, were greatly improved, although no decrease in intestinal Vibrio was noted. IFN-gamma and LZM, two cytokines that served as indicators for immune capacity, were at high levels during the whole experimental period. While in the control group, enteritis occurred. During the enteritis occurred period (e.g., day 30), TNF-alpha and IL-1 beta, two indicators usually for infection or inflammation, sharply increased, and the abundance of goblet cells reduced. These results confirmed that Lactobacillus spp. has a preventive effect on enteritis, and L. plantarum has a better effect than the other two species. Therefore, different doses (0, 5, 10 and 20 x 10(8) cfu/L) of L. plantarum were used to treat the enteritis diseased juveniles from an epidemic area in the third experiment. The results showed that in the high doses (10 and 20 x 10(8) cfu/L) groups, the survival rate (from 20% to > 45%) and the abundance of intestinal Lactobacillus (from 0.15% to 2.91%) were greatly elevated, respectively. These results confirmed that high dose of L. plantarum has a treatment effect on enteritis.

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