CN111690560A - Enterococcus faecium and application thereof in aquaculture - Google Patents
Enterococcus faecium and application thereof in aquaculture Download PDFInfo
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- CN111690560A CN111690560A CN202010521791.8A CN202010521791A CN111690560A CN 111690560 A CN111690560 A CN 111690560A CN 202010521791 A CN202010521791 A CN 202010521791A CN 111690560 A CN111690560 A CN 111690560A
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- enterococcus faecium
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- aquatic animals
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/46—Streptococcus ; Enterococcus; Lactococcus
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K10/00—Animal feeding-stuffs
- A23K10/10—Animal feeding-stuffs obtained by microbiological or biochemical processes
- A23K10/12—Animal feeding-stuffs obtained by microbiological or biochemical processes by fermentation of natural products, e.g. of vegetable material, animal waste material or biomass
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K10/00—Animal feeding-stuffs
- A23K10/10—Animal feeding-stuffs obtained by microbiological or biochemical processes
- A23K10/16—Addition of microorganisms or extracts thereof, e.g. single-cell proteins, to feeding-stuff compositions
- A23K10/18—Addition of microorganisms or extracts thereof, e.g. single-cell proteins, to feeding-stuff compositions of live microorganisms
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/14—Fungi; Culture media therefor
- C12N1/16—Yeasts; Culture media therefor
- C12N1/18—Baker's yeast; Brewer's yeast
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Mycology (AREA)
- Medicinal Chemistry (AREA)
- Animal Husbandry (AREA)
- Food Science & Technology (AREA)
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- Molecular Biology (AREA)
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- Botany (AREA)
- Marine Sciences & Fisheries (AREA)
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Abstract
The invention relates to the technical field of functional microorganism screening and application, and particularly provides a novel enterococcus faecium strainEnterococcus faecium) And provides its use in aquaculture. The enterococcus faecium is selected from intestinal tracts of healthy crucian carps, has a preservation number of CCTCC NO: M2020088, can obviously inhibit pathogenic bacteria, improve the immunity and anti-stress capability of aquatic animals, promote the growth of the aquatic animals, improve the reproductive performance of the aquatic animals, regulate water quality, and has obvious probiotic effect on the aquatic animals.
Description
Technical Field
The invention relates to the technical field of functional microorganism screening, in particular to enterococcus faecium and application thereof in aquaculture.
Background
In 1974 Parker initiated the probiotic, and it was first proposed that probiotics contribute to the intestinal microecological balance. At present, the probiotics are generally considered to have the main effects of improving the metabolism of animals, improving the absorption and utilization rate and the immunity of nutrient substances, reducing environmental pollution and the like. Probiotics are gradually widely used due to their non-toxicity, non-residue, non-drug resistance, non-pollution, etc.
With the development of aquaculture industry and the increase of aquaculture intensity, diseases of aquatic animals frequently occur. Traditional antibiotic drugs, while having positive utility in treating disease, have significant negative effects over long-term use: pathogenic bacteria generate drug resistance, and the efficacy is reduced; the drug residue interferes the growth and reproduction of beneficial microbial flora in the intestinal tracts of the aquatic animals, and influences the health of the aquatic animals; the antibiotics remained in the water body destroy the ecological environment of the cultivation, and the quality of the aquatic products is reduced.
Since Kozasa discovered that Bacillus subtilis isolated from soil can improve the ability of cultured eels to resist Vibrio edwarsiella (Edward sielladarda), research on the application of beneficial microorganisms in aquaculture has been rapidly developed. The function of the aquatic probiotics is mainly realized by regulating the intestinal microbial community structure, enhancing the absorption and utilization of the cultured organisms on nutrition and further promoting the growth of the cultured organisms; or by enhancing the nonspecific immune function of the cultured organisms, thereby improving the health level of the cultured organisms. At present, the probiotics applied to aquaculture are various, and the application of bacillus and saccharomyces is the most common. For example, in 2013 Mirbakhsh and the like, Bacillus subtilis SI02 and Bacillus subtilis IS03 (B.vallisportis IS03) are used in shrimp fry culture, so that the growth rate and the survival rate of the fries are improved. Wangyun in 2014 and the like discover a bacillus amyloliquefaciens SIP0902 separated from the intestinal tract of litopenaeus vannamei, and the strain has strong antagonistic effect on 7 aquatic animal pathogenic vibrios including vibrio parahaemolyticus, vibrio anguillarum, vibrio alginolyticus and the like. In 2017, Rongkeming and the like discovered a strain of saccharomyces cerevisiae F2, the strain can degrade ammonia nitrogen, can rapidly convert the ammonia nitrogen into protein in a culture water body, and simultaneously generates a large amount of bacteria to provide baits for aquatic animals, maintain the intestinal microecological balance of the aquatic animals, and improve the survival rate and yield of the aquatic animals. In 2019, the Xue Ming Yang et al discovered that a Bacillus methylotrophicus (Bacillus methylotrophicus) has an antibacterial effect on Aeromonas veronii, Aeromonas hydrophila, Aeromonas sobria, Edwardsiella, Pseudomonas fragi and Streptococcus agalactiae, and can be applied to the treatment of aquatic animal diseases.
The aquatic probiotics not only consider the colonization and the colonization time of the probiotics in the intestinal tract, but also pay attention to the characteristics of acid resistance, salt resistance, heat resistance and the like, and all factors can influence the activity and the action effect of the probiotics. Therefore, the selected probiotics should have the following characteristics: (1) the product can survive in low pH value and bile, can colonize in intestines and has strong competitive advantage; (2) easy to obtain, easy to propagate in vivo, easy to culture in vitro, and free from hybridization with pathogenic bacteria; (3) the generated antibacterial substances do no harm to the body; (4) the immunity of the organism can be improved; (5) after high-heat processing, the probiotics have good activity and high stability; (6) has no drug-resistant factors or contains few drug-resistant factors.
With the continuous improvement of the requirements of people on the safety and the quality of aquatic products and the increasingly prominent problem of diseases of aquaculture, probiotics become the best choice capable of replacing antibiotics and chemicals and preventing diseases of aquatic animals, so that the problem of screening high-quality probiotics suitable for aquaculture is the current urgent need to be solved.
Disclosure of Invention
The invention aims to provide a novel Enterococcus faecium (Enterococcus faecium) and application thereof in aquaculture. The enterococcus faecium is screened from intestinal tracts of healthy crucian carps, can obviously inhibit pathogenic bacteria, improve the immunity and anti-stress capability of aquatic animals, promote the growth of the aquatic animals, improve the reproductive performance of the aquatic animals, adjust the water quality and have obvious probiotic effect on the aquatic animals.
The invention provides Enterococcus faecium CD01(Enterococcus faecium CD01) which is preserved in China center for type culture collection (CCTCC NO: M2020088) of Wuhan university in Wuhan, China at 29 months in 2020.
The invention provides application of the enterococcus faecium in aquaculture.
The invention provides application of enterococcus faecium in aquatic product fermented feed.
The invention also provides a microbial preparation which comprises the enterococcus faecium.
The microbial preparation further comprises any one or the combination of two or more of bacillus subtilis, bacillus licheniformis, lactobacillus acidophilus, enterococcus faecalis, pediococcus acidilactici, saccharomyces cerevisiae, lactobacillus plantarum and bifidobacterium.
The viable bacteria content of enterococcus faecium in the microbial preparation is not less than 108U/ml。
The invention also provides application of the microbial preparation in aquaculture.
Advantageous effects
The enterococcus faecium CD01 screened by the invention has strong inhibition effect on two pathogenic bacteria, i.e. vibrio splendidus and vibrio parahaemolyticus; the compound is sensitive to penicillin, tetracycline, chloramphenicol and norfloxacin, shows drug resistance to gentamicin and shows moderate drug resistance to ciprofloxacin; the tolerance to acid and alkali is strong.
The enterococcus faecium CD01 can be used as a feed additive, remarkably promote the growth of cultured animals, and improve the immunity. Compared with a control group, the weight gain rate, SOD activity, LZM activity, POD activity and AKP activity of the carp fries in the probiotic group added with the enterococcus faecium CD01 are respectively improved by 61.9%, 42.0%, 64.3% and 14.3%, and the survival rate of the toxicity attacking test for vibrio parahaemolyticus is improved by 26.2%.
The enterococcus faecium CD01 can also be applied to the production of fermented feed. Compared with a control group, the shrimp weight gain rate and the specific growth rate of the experimental group fed with the enterococcus faecium CD01 fermented feed are respectively improved by 16.0 percent and 24.2 percent, and the bait coefficient is reduced by 14.0 percent; the experimental group respectively improves the activity of superoxide dismutase, lysozyme and peroxidase in the blood of the shrimps by 31.9 percent, 279.8 percent and 21.7 percent, and improves the total antioxidant capacity by 1.47 times. The effect is very obvious.
The enterococcus faecium CD01 screened by the method has excellent growth performance and strong stress resistance, can effectively inhibit pathogenic bacteria, promotes the growth of cultured animals, can improve the immunity of aquatic animals, improves the survival rate of the whole period, is beneficial to improving the economic benefit of farmers, and has wide application prospect in aquaculture.
Detailed Description
The equipment and reagents used in the examples of the present invention may be selected from any commercially available ones. For the specific methods or materials used in the embodiments, those skilled in the art can make routine alternatives based on the existing technologies based on the technical idea of the present invention, and not limited to the specific descriptions of the embodiments of the present invention.
The culture medium selected in the examples comprises the following specific formula:
MRS culture medium: 10g of peptone, 10g of beef extract, 20g of glucose, 5g of yeast powder, tween-80 lml, 2g of monopotassium phosphate, 2g of diammonium citrate, 5g of sodium acetate, 0.58g of magnesium sulfate, 0.15g of manganese sulfate, 1000ml of distilled water, pH6.2-6.4, 15-20g of agar to prepare a solid culture medium, and sterilizing at 115 ℃ for 20 min.
Nutrient broth medium (1L): 10g of peptone, 3g of beef extract and 5g of sodium chloride. Adding the above components into distilled water, diluting to 1000mL, heating for dissolving, and adjusting pH to 7.3 + -0.2; subpackaging, and autoclaving at 121 deg.C for 20 min. (Note: solid medium on this basis 1.5% agar powder was added).
2216E seawater culture Medium: 5g of old protein, 1g of yeast extract, 0.01g of iron phosphate, 1000ml of seawater, pH7.6-7.8, preparing a solid culture medium, adding 15-20g of agar, and sterilizing at 121 ℃ for 20 min.
TSB medium: tryptone soybean broth 30g, sodium chloride 15g, distilled water 1000ml, pH7.4-7.6, preparing solid culture medium, adding agar 15-20g, and sterilizing at 121 deg.C for 20 min.
The invention is further illustrated by the following specific examples.
Example 1 isolation, screening and identification of strains
1. Sample (I)
The crucian carps collected in the river course in the nine dragons town of the Guidao city.
2. Screening method
The method comprises the following steps of washing the body surface of crucian with sterile water, dissecting, taking out intestinal tracts, removing attachments such as mesentery and the like, shearing the intestinal tracts with intestinal tract contents, adding 2mL of precooled sterile normal saline, fully homogenizing, centrifuging, and taking supernatant for 10-time serial dilution. Taking the stock solution 10-1、10-2The samples of three dilutions, 100uL each, were plated on MRS plates, 3 per dilution gradient were set in parallel, and incubated at 35 ℃ for 48 h. Single colonies which grow well are picked and purified by streaking for many times, and the strains are numbered as CD01, CD02, CD03 … and CD18, and the purified strains are prepared into bacterial suspension by using 40% of glycerol and MRS liquid culture medium 1:1 and are preserved at the temperature of 80 ℃ below zero for later use.
Diluting the activated bacterial liquid of the strain, coating the diluted bacterial liquid on an MRS plate, and culturing at 10 ℃ and 55 ℃ to observe the growth condition; and spread on MRS plate after adjusting pH to pH4.0, pH9.6, place at 35 deg.C and culture and observe the growth; the cells were also spread on MRS plates supplemented with 6.5% NaCl and incubated at 35 ℃ to observe growth. Through a growth observation comparison test, 9 strains including CD01, CD04, CD06, CD07, CD11, CD14, CD15, CD17 and CD18 are selected to be more excellent.
Pathogenic bacteria, namely Vibrio splendidus and Vibrio parahaemolyticus are taken as indicator bacteria, and probiotic bacteria are screened by adopting a plate antagonism method. The bacterial liquid to be screened is spotted on a flat plate coated with indicating bacteria, the culture is carried out at the constant temperature of 28 ℃, whether a bacteriostatic transparent area or a bacteriostatic coverage area appears around a spot seeding area is observed within 48 hours, the diameters of bacteriostatic rings and bacterial colonies are respectively measured, the bacteriostatic effect of each strain is evaluated, and the specific result is shown in table 1.
TABLE 1 bacteriostatic behavior of the strains to be screened
As can be seen from the data in Table 1, the 9 strains of bacteria screened by the invention have different degrees of inhibitory effects on Vibrio splendidus and Vibrio parahaemolyticus, wherein the CD01 strain has the strongest inhibitory effect on the two pathogenic bacteria.
3. Identification of strains
(1) Biological characteristics of colonies:
the CD01 strain has good growth performance on an MRS agar plate, and can form milky circular colonies with the size of 0.5-1mm after 30 hours; the bacterial colony is round, smooth and raised; the growth and proliferation capacity is strong, the facultative anaerobic growth can be realized, the growth can be realized within the range of 10-55 ℃, and the optimal growth temperature is 28-40 ℃; the pH value of the growth pH value range is 4-10, and the optimum pH value is 5.3-6.8.
The biochemical characteristics of part of the CD01 strain are shown in Table 2:
TABLE 2 partial Biochemical Properties of the CD01 Strain
Note: "+" indicates a positive reaction, and "-" indicates a negative reaction
(2) Molecular biological identification
Genomic DNA of the CD01 strain was extracted, 16SrRNA sequence was amplified by PCR technique, and the sequencing results were subjected to NCBI BLAST alignment analysis. The result shows that the 16S rRNA sequence similarity of the CD01 strain and the published multiple strains of Enterococcus faecium is as high as 98.8%, and the identification proves that the strain is the Enterococcus faecium (Enterococcus faecium), which is consistent with the biochemical identification result.
The applicant named the CD01 strain as Enterococcus faecium CD01(Enterococcus faecium CD01), which was deposited in China Center for Type Culture Collection (CCTCC) at 29/4/2020, Wuhan university, Wuhan Han, China, with the deposition number of M2020088.
EXAMPLE 2 enterococcus faecium CD01 test for acid and alkali resistance
The activated enterococcus faecium CD01 is inoculated in hydrochloric acid solution with the pH value of 2.5, sodium hydroxide solution with the pH value of 10.0 and distilled water with the pH value of 6.8 respectively in an inoculation amount of 2 percent, the culture solution with the pH value of 0h, 1h, 2h and 4h is taken and statically cultured at the temperature of 37 ℃, the continuous 10-fold dilution is respectively carried out, 0.1mL of the culture solution is taken from each dilution degree and coated on an MRS plate, the growth condition is observed, the colony count is carried out, the viable bacteria retention rate is calculated, and the specific result is shown in the table 3.
Viable cell retention (%) - (viable cell amount at a certain hour-viable cell amount at 0 hour)/viable cell amount at 0 hour × 100%.
TABLE 3 tolerance of enterococcus faecium strain CD01 to various pH environments
As can be seen from the results in Table 3, the viable count of enterococcus faecium CD01 provided by the invention is only slightly reduced after 2h and 4h of incubation under the condition of pH2.5, the viable count retention rate exceeds 95%, and the viable count is maintained at 3.78 × 10 after 2h and 4h of incubation under the condition of pH10.07CFU/mL, the viable bacteria retention rate exceeds 97%; whereas the amount of enterococcus faecium CD01 increased by 39.8% and 103.1% when incubated at ph 6.8. Therefore, the enterococcus faecium CD01 provided by the invention has strong tolerance to acid-base conditions, and lays a foundation for the wide application of the enterococcus faecium CD 01.
EXAMPLE 3 enterococcus faecium CD01 susceptibility testing to various antibiotics
Thawing MRS solid culture medium, cooling to 50 deg.C, and adding activated MRS into the culture medium every 30mLEnterococcus faecium CD01 bacterial liquid 0.5mL (about 10)8CFU/mL), pouring the plate, placing common antibiotic (penicillin, gentamicin, tetracycline, chloramphenicol, norfloxacin, ciprofloxacin) drug sensitive paper sheets into the plate after the surface of the plate is slightly dry, culturing at 35 ℃, observing the growth condition, and measuring the diameter of the inhibition zone.
TABLE 4 sensitivity test results of enterococcus faecium strain CD01 to various antibiotics
From the results in table 4, it can be seen that enterococcus faecium CD01 provided by the present invention is sensitive to penicillin, tetracycline, chloramphenicol, and norfloxacin, and shows resistance to gentamicin and moderate resistance to ciprofloxacin.
Example 4 Effect of enterococcus faecium CD01 on carp growth, immunity and disease resistance
1. Preparation of fungal powder
Activating enterococcus faecium CD01, performing amplification culture, liquid-state fermentation, centrifuging, concentrating, and lyophilizing to obtain extract with viable bacteria content of about 1010CFU/g of bacterial powder.
2. Design of experiments
Experiment set is provided with a control group and a probiotic group, and each group is respectively provided with three parallels. 30 tails of each parallel crucian carp fry (the initial weight is 6.98 +/-0.14 g). Wherein, the control group takes commercial feed as basic feed, and the probiotic group is prepared by adding enterococcus faecium CD01 powder into the basic feed by 3.5 ‰, and mixing well for feeding Cyprinus Carpio fry. The cultivation experiment is carried out in an indoor circulating water cultivation system for 30 days, the bait is thrown twice every day, the pH value is 7.6 +/-0.4, the water temperature is 20-22 ℃, and the dissolved oxygen is sufficient.
And after the culture experiment is finished, counting and weighing the carps, and calculating the specific growth rate of the carps. 3 fish were randomly drawn from each group. Anaesthetizing with 100mL/L oleum Caryophylli, extracting Cyprinus Carpio blood by tail vein blood sampling method, standing at 37 deg.C for 1h, centrifuging at 5000r/min for 10min, collecting serum, and storing at-80 deg.C; detecting activities of superoxide dismutase (SOD), Lysozyme (LZM), catalase (POD) and alkaline phosphatase (AKP) in serum. And taking vibrio parahaemolyticus as a pathogenic bacterium, performing intraperitoneal injection on the carp, observing for 2 weeks, timely fishing out dead carp fries, and calculating the survival rate. The specific results are shown in Table 5.
TABLE 5 Effect of enterococcus faecium CD01 on carp growth, immunity and disease resistance
| Control group | Probiotic additive group | |
| Initial body weight g | 6.99±0.14 | 6.97±0.13 |
| Terminal body weight g | 13.25±0.41 | 14.37±0.47 |
| The weight gain rate% | 89.56±1.79a | 106.17±2.07b |
| SOD activity mU/L | 0.42±0.03a | 0.68±0.04b |
| LZM Activity mU/L | 0.50±0.03a | 0.71±0.05b |
| POD Activity mU/L | 0.28±0.02a | 0.46±0.04b |
| AKP Activity mU/L | 0.49±0.05 | 0.56±0.04 |
| Survival rate% | 67.8±5.1a | 85.6±1.9b |
Note: different letters indicate significant differences (P < 0.05).
As can be seen from the results in table 5, the weight gain, SOD activity, LZM activity, POD activity, and AKP activity of carp fries in the probiotic group added with enterococcus faecium CD01 were respectively improved by 61.9%, 42.0%, 64.3%, and 14.3%, and the survival rate in the challenge test against vibrio parahaemolyticus was improved by 26.2%, compared with the control group. Therefore, the enterococcus faecium CD01 has a remarkable promoting effect on the growth of carp fries, can effectively improve the immunity of the carp fries and the resistance to vibrio parahaemolyticus, and can be widely applied to the culture production process of fishes as probiotics.
Example 5 Effect of feed fermented with enterococcus faecium CD01 on the growth of Penaeus vannamei
The experiment is provided with a control group and a fermented feed group, and commercial compound feed for prawns sold in the market is used as basic feed. Wherein, the control group is fed with basic feed, and the fermented feed is processed as follows: inoculating enterococcus faecium CD01 in nutrient broth culture medium at an inoculation amount of 1%, standing at 35 deg.C for 20 hr, and confirming that the concentration of bacteria reaches 108And (3) more than CFU/ml, then inoculating the bacterial liquid into the basal feed in an inoculation amount of 2%, and adding sterile water to adjust the final water content to 29-30%. Will be mixed withThe compound is put into a breathing fermentation bag and sealed, and is fermented for 96 hours at constant temperature of 35 ℃. After fermentation, the fermented product has special fermentation flavor, and is frozen in a refrigerator at the temperature of-20 ℃.
Each group is provided with three parallels, and each parallels 50 litopenaeus vannamei. The culture experiment lasts for 8 weeks, feeding is carried out according to 3-4% of the weight of the shrimps every day, the feeding amount is adjusted at any time according to the food intake condition, and the dry matter weight of the feed fed by the control group and the fermented feed group is kept consistent; the feeding is carried out once in the morning and at night every day, and the bottom suction and the pollution discharge are carried out once. During the experiment, the dissolved oxygen is more than or equal to 7mg/l, the temperature is 28 +/-2 ℃, the salinity is 20-22 per mill, and the pH is 8.0 +/-0.3. And after the culture experiment is finished, counting and weighing the litopenaeus vannamei, and calculating the survival rate, the specific growth rate, the weight gain rate and the like of the litopenaeus vannamei. Taking 15-20 shrimps in parallel! Inserting into heart with sterile syringe, collecting blood, centrifuging, removing serum, packaging, and storing; the kit is used for measuring the activity of serum superoxide dismutase, lysozyme, peroxidase, total antioxidant capacity and the like. Specific results are shown in tables 6 and 7.
TABLE 6 Effect of enterococcus faecium CD01 fermented feed on the growth and survival of Penaeus vannamei
| Control group | Fermented feed group | |
| Initial body weight g | 1.42±0.05 | 1.41±0.05 |
| Terminal body weight g | 5.95±0.30 | 6.49±0.24 |
| Survival rate% | 86.67±4.16a | 96.67±2.31b |
| The weight gain rate% | 319.05±21.79a | 370.09±15.36b |
| Specific growth rate% | 2.36±0.08a | 2.93±0.06b |
| Coefficient of bait | 1.57±0.10a | 1.35±0.07b |
Note: different letters indicate significant differences (P < 0.05).
TABLE 7 influence of enterococcus faecium CD01 fermented feed on the immunity of Penaeus vannamei Boone
| Control group | Fermented feed group | |
| Activity of superoxide dismutase | 204.42±17.03a | 269.68±23.04b |
| Lysozyme activity | 1.24±0.93a | 4.71±2.05b |
| Peroxidase activity | 57.57±2.32 | 70.08±1.03 |
| Total antioxidant power | 3.46±0.65a | 8.56±0.74b |
Note: different letters indicate significant differences (P < 0.05).
As can be seen from the results of tables 6 and 7, compared with the control group, the experimental group fed with the enterococcus faecium CD01 fermented feed respectively improves the shrimp weight gain rate and the specific growth rate by 16.0 percent and 24.2 percent, and reduces the bait coefficient by 14.0 percent; the experimental group respectively improves the activity of superoxide dismutase, lysozyme and peroxidase in the blood of the shrimps by 31.9 percent, 279.8 percent and 21.7 percent, and improves the total antioxidant capacity by 1.47 times. Therefore, the enterococcus faecium CD01 provided by the invention can obviously promote the survival and growth of cultured animals, improve the immunity and disease resistance of the cultured animals, and achieve unexpected technical effects.
In conclusion, the enterococcus faecium CD01 screened by the method has excellent growth performance and strong stress resistance, can effectively inhibit pathogenic bacteria, can be used as a feed additive to promote the growth of cultured animals, can improve the immunity of aquatic animals, can improve the survival rate of the whole period, is beneficial to improving the economic benefit of farmers, and has wide application prospect in aquaculture.
Claims (7)
1. The enterococcus faecium is characterized in that the preservation number of the enterococcus faecium is CCTCC NO: M2020088.
2. The use of enterococcus faecium according to claim 1 in aquaculture.
3. The use of enterococcus faecium according to claim 1 in an aquatic fermented feed.
4. A microbial preparation comprising the enterococcus faecium of claim 1.
5. The microbial preparation of claim 4, further comprising any one or a combination of two or more of Bacillus subtilis, Bacillus licheniformis, Lactobacillus acidophilus, enterococcus faecalis, Pediococcus acidilactici, Saccharomyces cerevisiae, Lactobacillus plantarum, and Bifidobacterium.
6. The microbial preparation of claim 4 or 5 wherein the microbial preparation has a viable bacteria count of enterococcus faecium of no less than 108U/ml。
7. Use of a microbial preparation according to any one of claims 4 to 6 in aquaculture.
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