China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (7): 2805-2811.doi: 10.16431/j.cnki.1671-7236.2022.07.039

• Basic Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification and Biological Characteristics of a Strain of Lactobacillus plantarum from Carp

YANG Zemin1,2, LI Shuang1,2, JIN Zhengyu1,2, LIAO Yixiao1,2, YANG Ying1,2,3, WEN Ming1,2,3   

  1. 1. College of Animal Science, Guizhou University, Guiyang 550025, China;
    2. Guizhou Provincial Key Laboratory of Animal Diseases and Veterinary Public Health, Guiyang 550025, China;
    3. Guizhou Engineering Research Center of Animal and Biological Products, Guiyang 550025, China
  • Received:2021-12-13 Online:2022-07-05 Published:2022-06-29

Abstract: 【Objective】 The aim of this study was to screen the cyprin-derived lactic acid bacteria with excellent probiotics as candidate bacterial strains for aquaculture probiotics.【Method】 In this experiment,the intestinal contents and mucous membrane of carp were used as the sources of bacterial isolates.MRS medium was used for bacterial isolates and purification.After identification by 16S rRNA sequencing,the biological characteristics of isolated strains,such as growth characteristics,acid production capacity,acid tolerance,bile salt tolerance,antibacterial characteristics,drug sensitivity and safety were analyzed.【Result】 The results showed that a strain of Lactobacillus plantarum was successfully isolated and named YY001.On MRS medium,the colony morphology of the isolated strain was round,smooth surface,neat edge,milky white,Gram-positive,spun-free,blunt short-bacillus.The strain began to grow in logarithmic phase after 4 h,and reached a stable phase after 12 h.The strain had a strong acid production capacity.The acid production curve showed that pH decreased rapidly from 0 to 12 h,and pH reached 3.8 after 16 h culture.The strain had a certain tolerance to acid and bile salt at pH 3.0 and 0.3% bile salt.The strain had bacteriostatic effect on Flavobacterium columnar,Aeromonas vibrii and Aeromonas hydrophila,and the bacteriostatic effect on Flavobacterium columnar was very significant,and the diameter of bacteriostatic zone was 34.19 mm.The drug sensitivity test showed that the strain was resistant to kanamycin,streptomycin and vancomycin.Once a day for one week,108 CFU isolated strain had no toxic effect on mice after feeding.【Conclusion】 The strain YY001 isolated in this study had excellent biological characteristics,which could be used as a candidate strain for aquaculture probiotics,and laid a foundation for the subsequent preparation of probiotics for carp.

Key words: carp; Lactobacillus plantarum; isolation and identification; biological characteristics

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