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  • Title: Dietary administration of the probiotic, Lactobacillus plantarum, enhanced the growth, innate immune responses, and disease resistance of the grouper Epinephelus coioides.
    Author: Son VM, Chang CC, Wu MC, Guu YK, Chiu CH, Cheng W.
    Journal: Fish Shellfish Immunol; 2009 May; 26(5):691-8. PubMed ID: 19264134.
    Abstract:
    The percent weight gain (PWG) and feed efficiency (FE) of Epinephelus coioides were calculated, and the lactobacilli and total microbiota in the posterior intestines, and non-specific immune parameters of grouper, and its susceptibility to Streptococcus sp. and an iridovirus were determined when the fish were fed diets containing Lactobacillus plantarum at 0 (control), 10(6), 10(8), or 10(10) colony-forming units (cfu) kg(-1) for 4 weeks. Results showed that grouper fed a diet containing L. plantarum at the levels of 10(6), 10(8), and 10(10) cfu kg(-1) had significantly increased PGW and FE especially at 10(8) cfu kg(-1) group which were 404.6% and 1.26, respectively. L. plantarum significantly increased in the fish posterior intestines during the L. plantarum feeding period, but decreased rapidly from the intestine within 1 week after changing to the control diet (without L. plantarum). Fish fed a diet containing L. plantarum at 10(6) and 10(8) cfu kg(-1) had significantly higher survival rates than those fed the control diet after challenge with Streptococcus sp., as well as those fed 10(8) cfu kg(-1) after challenge with an iridovirus, causing increases in the survival rates of 23.3%, 20.0%, and 36.7%, respectively, compared to the control group. The alternative complement activity (ACH(50)) level of fish fed diets containing L. plantarum after 4 weeks was significantly higher than that of fish fed the control diet, and that of the 10(8) cfu kg(-1) group was significantly higher than those of the 10(6) and 10(10) cfu kg(-1) groups, which increased by 83.4% compared to the control group. The lysozyme activity and glutathione peroxidase (GPx) activity of fish fed the L. plantarum-containing diets at 10(8) and 10(10) cfu kg(-1) significantly increased compared to those fed the 10(6) cfu kg(-1)L. plantarum diet and control diet, and had increased by 76.3% and 136.6%, and 57.1% and 113.3%, respectively, compared to those fed the control diet. The phagocytic activity (PA), phagocytic index (PI), and respiratory bursts of head kidney leucocytes of fish fed 10(6), 10(8), and 10(10) cfu kg(-1)L. plantarum diets were significantly higher than those of fish fed the control diet after 4 weeks of feeding, and increased 2.2-, 2.2-, and 2.3-fold; 1.8-, 1.8-, and 2.0-fold; and 1.4-, 1.4-, and 1.4-fold, respectively, compared to the control group. We therefore recommend dietary L. plantarum administration at 10(8) cfu kg(-1) to promote growth and enhance immunity and resistance against Streptococcus sp. and an iridovirus of E. coioides.
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