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Rathod, N.; Nirmal, N.; Pagarkar, A.; Ozogul, F.; , . Antimicrobial Impacts of Microbial Metabolites on Fishery Products. Encyclopedia. Available online: (accessed on 17 June 2024).
Rathod N, Nirmal N, Pagarkar A, Ozogul F,  . Antimicrobial Impacts of Microbial Metabolites on Fishery Products. Encyclopedia. Available at: Accessed June 17, 2024.
Rathod, Nikheel, Nilesh Nirmal, Asif Pagarkar, Fatih Ozogul,  . "Antimicrobial Impacts of Microbial Metabolites on Fishery Products" Encyclopedia, (accessed June 17, 2024).
Rathod, N., Nirmal, N., Pagarkar, A., Ozogul, F., & , . (2022, April 27). Antimicrobial Impacts of Microbial Metabolites on Fishery Products. In Encyclopedia.
Rathod, Nikheel, et al. "Antimicrobial Impacts of Microbial Metabolites on Fishery Products." Encyclopedia. Web. 27 April, 2022.
Antimicrobial Impacts of Microbial Metabolites on Fishery Products

Biopreservative bacteria, or their metabolites, compete with the undesirable microbiota and dominate the microbiota by utilizing available nutrients. Microbial metabolites (bacteriocins, reuterin, pediocin, lacticin, bacteriophage, organic acids and others) possess antimicrobial activity against a wide spectrum of spoilage and pathogenic microorganisms, including anti-listeria.

antimicrobials metabolites biopreservation seafood food security bacteriocins organic acids reuterins bacteriophages and endolysins

1. Microbial Spoilage of Fish and Fishery Products

Fish and fishery products (FFPs) contain a wide array of microorganisms from different environments. These microorganisms lead to the spoilage of FFPs and pose health risks to consumers. Fish surfaces contain the microbiota, including natural microorganisms of the waters, from which fish are harvested, as well as acquired cross contamination microbiota which includes microorganisms entering the food from fish’s contact surfaces, the air, soil, water/ice used for washing/fish handlers, packaging material and the storage environment [1][2][3]. Generally, microorganisms are mainly associated with the outer slime, gills and intestines [3]. The microbial load is higher in the intestines, followed by the gills and skin (102–107 CFU/cm2). Normally, the microbial load ranges from 102–107 colony-forming units (CFU)/cm2 on the skin’s surface [1], whereas in the gills and the intestines, both contain between 103 and 109 CFU/g [4][5].
Fresh healthy fishes are usually sterile as the immune system of the fish prevents bacteria from growing in the flesh. After the death/harvest of fish during storage, the microorganisms invade the flesh by moving between the muscle fibers. The natural microbiota of fish varies depending on the habitat of the fish, whether freshwater, marine or brackish water, its feeding habit and its life history stages. Generally, warm water fish have more mesophilic bacteria than cold water fish. Fish harvested from polluted/contaminated water contain a variety of microorganisms depending on the nature of the pollutant/contaminant, and also human pathogens such as bacteria, fungi, viruses, protozoans, parasites and so on [6]. Very high microbial numbers of 107 CFU/cm2 are found on fish from polluted warm waters. They play an important role in spoilage and lead to food poisoning. Thus, it is necessary to maintain the quality of fish and fish products by inhibiting the associated microorganisms and preventing their growth. The different preservation methods mainly aim at maintaining fish quality by reducing, killing or inactivating associated spoilage microorganisms [1].
In general, Gram-negative, psychrotrophic, rod-shaped bacteria belonging to the genera Pseudomonas, Moraxella, Acinetobacter, Shewanella and Flavobacterium are dominated in temperate water fish, whereas members of the Vibrionaceae (Vibrio and Photobacterium spp.) and the Aeromonadaceae (Aeromonas spp.) are common of the fish microbiota [7][8]. Gram-positive bacteria, such as Bacillus, Micrococcus, Clostridium, Lactobacillus and coryneforms, can also be found in varying proportions, but in general, Gram-negative bacteria dominate the microbiota [9][10]. Gram-positive Bacillus and Micrococcus were found to dominate the fish from tropical waters [11][12]. Microbiota consisting of Pseudomonas, Acinetobacter, Moraxella and Vibrio spp. have been observed on newly-caught fishes [13][14]. In polluted waters, high numbers of Enterobacteriaceae may be found. In clean temperate waters, these microorganisms disappear rapidly, but it has been shown that Escherichia coli and Salmonella spp. can survive for very long periods in tropical waters and once introduced, may almost become indigenous to the environment [15].
The growth of microorganisms and their metabolism is a major cause of fish spoilage as they produce biogenic amines such as putrescine, histamine and cadaverine, organic acids, sulfides, alcohols, aldehydes and ketones with unpleasant and unacceptable off-flavors [16][17][18]. Spoilage is a combined result of Gram-negative fermentative bacteria (Vibrionaceae). Gram-negative, psychrotolerant bacteria (Pseudomonas and Shewanella spp.) tend to spoil unpreserved or chilled fish [1][19].
Trimethylamine (TMA) levels are used universally to correlate with the extent of microbial deterioration responsible for fish spoilage [1][20]. Trimethylamine oxide (TMAO) is used as an osmoregulant to avoid dehydration in marine environments [1]. Bacteria such as Shewanella putrifaciens, Aeromonas spp., psychrotolerant Enterobacteriacceae, Pseudomonas phosphoreum and Vibrio spp. can obtain energy by reducing TMAO to TMA, creating the ammonia-like off-flavors [18].
The total volatile base (TVB-N) rises even after Trimethylamine (TMA)  has reached its maximum, which is due to proteolysis, and it starts when several of the free amino acids have been used. Lerke et al. [21] separated fish juice into a protein and a non-protein fraction and inoculated spoilage bacteria in both fractions. The non-protein fraction of fish juice spoiled, as did the whole juice, whereas only faint off-odors were detected in the protein fraction of the juice. Bacteria action during the spoilage of fish used the substrate for the formation of compounds, for example, from substrate amino acids (glycine, serine, leucine), several esters, ketones, aldehydes, amino acids, urea, cysteine, carbohydrates and lactate acetate, carbon dioxide, water, Trimethylamine oxide (TMAO), TMA, and methionine were produced by bacteria.
The anaerobic storage of fish for a long-time results in vigorous the production of ammonia owing to the degradation of the amino acids and the accumulation of lower fatty acids (acetic, butyric and propionic acids) [1][2]. Obligate anaerobes belonging to the family Bacteroidaceae and the genus Fusobacterium were found to be very strong ammonia producers [22]. These bacteria grew only in the spoiled fish extract and have little or no proteolytic activity relying on already hydrolyzed proteins.

2. Antimicrobial Mechanism of Microbial Metabolites

2.1. Bacteriocins

Bacteriocins are ribosomal synthesized proteins or peptides with a bactericidal or bacteriostatic action [23]. Due to their antimicrobial activity against several spoilage and pathogenic microorganisms, bacteriocins are widely under evaluation for the preservation and shelf-life extension of foods [24][25]. Both Gram-positive and Gram-negative bacteria are known to produce bacteriocins. Bacteriocins exhibit a diverse preservative action by diverse mechanisms, such as their positive charge which interacts with negatively charged cell wall constituents forming a pore in the cell wall, and inhibit the synthesis of the cell wall [26][27]. In some cases, the terminal end of the peptide group of bacteriocins causes leaking of cellular constituents, and inhibits protein synthesis and DNA replication [28][29]. Bacteriocins have recently been reported to hamper the replication of bacteria cells by inhibiting the formation of a septum in the bacteria [26][30]. Apart from this, they are also known to compete for nutrients and produce secondary metabolites which further extend the inactivation of microorganisms [31]. Bacteriocins have been classified into three classes based on their molecular weight and post-translational modification, imparting on them different antimicrobial actions [32][33][34]. Class-I bacteriocins are post-translationally modified heat-stable peptides with a molecular weight of less than 10 kDa. Further, Class-I bacteriocins are subdivided into six subclasses of Ia to If [35]. Class-II bacteriocins consist of unmodified heat-stable peptides with a molecular weight of less than 10 kDa and subdivided into Class-IIa to IId types. Class-III bacteriocins are unmodified heat-sensitive proteins with a molecular weight of more than 10 kDa and include two subtypes (IIIa and IIIb) [35]. Several techniques, including bacteriocins for the preservation of FFPs.
Nisin is classified as a Class-Ia (lantibiotic) and produced by the Lactococcus lactis subsp. lactis. Nisin is composed of 34 amino acid residues with a molecular weight of 3.5 kDa [35]. Recently, nisin has been investigated in combination with other hurdles to enhance the biopreservative ability and stability of the nisin [36]. Chatzidaki et al. [37] reported that nisin-loaded nanocarriers showed enhanced antibacterial activity of Lactococcus lactis, Staphylococcus aureus, Listeria monocytogenes and Bacillus cereus by microemulsion formulation using essential oils as nano-carriers.

2.2. Reuterin

Reuterin is a non-proteinaceous low-molecular-weight compound produced by Lactobacillus reuteri, exerting the inhibition of microorganisms (Gram-positive and -negative). Reuterin creates imbalances in the microbial cells by the depletion of free thiol groups and the stopping dimer from blocking the enzymatic activity, leading to cell death [38][39]. The aldehyde part of reuterin is also known to inactivate proteins by reacting with the amine group [32][40]. Considering the safety aspects for involving reuterin in a food model, Soltani et al. [41] suggested that the maintained cell integrity and improved viability of cells was observed. Furthermore, a better stability of reuterin in the gastrointestinal (GI) tract was found without any toxic effect. Furthermore, the stability of reuterin in combination with other non-thermal techniques has been successfully demonstrated [42]. Reuterin has exhibited antimicrobial activity against the food borne pathogens E. coli, L. monocytogenes, S. aureus and Salmonella spp. [43].
Seabass coated with freeze dried L. reuteri DSM 26866 (2%) in sodium alginate was evaluated for protective effects (Angiolillo, Conte, & Del Nobile, 2018). Reuterin was found in samples fermented with L. reuteri for 24 (0.49 g/L) and 48 (0.55 g/L) hours. A significant control of aerobic plate counts, Pseudomonas spp., hydrogen sulfite-producing bacteria and Enterobacteriaceae was observed. The inhibitions were attributed to the reuterin produced, extending the microbial shelf-life of the seabass fillets [43]. Additionally, the active coating retained the sensory quality (color and texture) due to the fermentation action. The application of reuterin (10 AU/g), produced by Lactobacillus reuterin INIA P579, for the preservation of cold-smoked salmon was evaluated by Montiel et al. [44]. The application of reuterin significantly reduced Listeria monocytogenes growth by 2 log units after 15 days of storage. However, reuterin in combination with a high hydrostatic pressure (450 MPa for 5 min.) exhibited effectiveness in the inactivation of L. monocytogenes and biogenic amines’ formations in cold-smoked salmon [45]. The combination reduced the microbial population by 3.16 log (CFU/g) in comparison to the control at 4 °C. It was suggested that the inactivation was due to the synergistic interaction between the high hydrostatic pressure and the natural preservative reuterin in this case. Further, to enhance the bioavailability of reuterin, microencapsulated Lactobacillus reuteri with modified atmospheric packaging (95% CO2 and 5% O2) were evaluated for preserving a tuna burger [46]. Different compositions of sodium alginate had impacts on the generation of reuterin, ranging between 0.640, 0.116 and 0.108 g/L in 2, 1 and 0.5% sodium alginate, respectively. The application of L. reuterin reduced the mesophilic bacteria and Pseudomonas spp. population at all concentrations evaluated. However, further increased inhibitions were observed in samples packed under modified atmospheric conditions. Combinations of biopreservation methods with other technologies to enhance preservation are suggested.
Reuterin produced and isolated from Lactobacillus reuteri INIA P579 was examined against L. monocytogens in cold-smoked salmon [45]. The results indicated that reuterin (10 Au/g) significantly lowered L. monocytogens counts in cold-smoked salmon by 2.0 and 1.0 log (CFU/g), compared to the control at 8 °C for 15 days and 30 °C for 48 h. Hence, the LAB metabolites enhanced the quality of fish products by lowering the microbial and chemical changes during refrigerated storage. Additionally, the efficacy of the metabolite could be increased by a combination effect with other hurdles or incorporated into emulsion, capsules or active packaging material. The microbial inactivation was found to increase when used in combination with other preservation technology due to a synergistic effect. The inclusion is usually at lower levels and no negative impacts on sensory qualities have been reported.

2.3. Bacteriophages and Endolysins

Bacteriophages are specific bacterial viruses, infecting specific groups of bacteria by replicating inside the host, causing lysis of bacteria [47]. Additionally, bacteriophages are known to produce lytic proteins which further extend the antimicrobial activity [48]. Kim et al. [49] reported the effective control of Vibrio vulnificus on seafood (abalone) using the novel bacteriophage VVP001. Endolysins are specific antimicrobial peptidoglycan hydrolases synthesized by bacteriophages during multiplication. Due to their safety and non-resistance-development nature, they are evaluated in the preservation of foods [49][50][51][52]. The mechanism of action for endolysins is different for Gram-positive and Gram-negative bacteria, as explained by Chang [50].
Combined effects of a bacteriophage cocktail (φ SboM-AG3, φ SsoM-AG8 and φ SboM-AG10) at a concentration of 109 PFU/mL, in combination with a high hydrostatic pressure against Vibrio cholerae against salmon fillets and mussels were reported by Ahmadi et al. [53]. The inclusion of bacteriophages reduced V. cholerae by 1.2 log (CFU/g) in both salmon and mussels. Additionally, the combination of bacteriophages and a high hydrostatic pressure at 350 MPa further reduced the population by 3.8 and 3.9 log (CFU/g) in salmon and mussels, respectively. The effective decontamination of rainbow trout (Salmo irideus) using six bacteriophage cocktails [108 plaque-forming unit (PFU)/mL] was evaluated [54]. Fish samples treated with a bacteriophage cocktail had a shelf-life extension of 3 days. Five bacteriophage cocktails against Salmonella enterica in salmon fillets, raw and smoked, were evaluated by Galarce et al. [55]. A lower temperature storage (4 °C) was much more effective in controlling Salmonella enterica [56] than a higher temperature (18 °C). The highest inhibition was observed in raw fillets [2.82 log (CFU/g)] in comparison to the smoked [1.16 log (CFU/g)] samples during the 10-day period, reported at 4 °C. The differences in inhibitions were attributed to differences in the water content required for the mobilization of bacteriophages [55].
Pathogenic Listeria monocytogenes on tuna sashimi could be reduced by the application of Bacteriophage P100 (5 and 8 log PFU/g). The application of the phage at 8 log PFU/g exhibited promising results by reducing the 4.44 log CFU/g population of L. monocytogenes. This intervention could increase the safety of ready-to-eat sashimi [57]. The antilisterial activity by Listex P100 was demonstrated on fresh channel fish fillets [58]. A contact time of 15 min was sufficient to reduce the Listeria monocytogenes colony population by 1 log CFU/g level on the fish surface. An application dose of 2 × 107 significantly reduced the listerial population and varied at different temperature ranges (4 °C—1.7 to 2.1 log CFU/g, and 10 °C—1.6 to 2.3 log CFU/g). Moreover, the application of Bacteriophage P100 exhibited broad efficiency against Listeria strains from varied strains. Their application in coleslaw food caused a reduction in the contamination of Listeria monocytogenes ScottA by 10-fold levels [59]. The bacteriophage from traditional Indonesian ready-to-eat food sources has the ability to inhibit pathogenic Escherichia coli on fish meat by 63.78% and 87.89% when incubated for 1 day and 6 days at 4 °C [56]. Recent reports are also available [60] for the inhibition of Clostridium perfringens in cooked meats using a bacteriophage obtained from a plant source. The endolysin PlyP825 at a level of 34 µg/mL reduced the inactivation of L. monocytogenes in smoked salmon (<1 log CFU/g), however, a combination of endolysin with a high hydrostatic pressure (500 MPa) increased this inhibition (>1 log CFU/g) [61]. Bacteriophages and derived endolysins are used for the preservation of foods due to their high host specificity. Considering their lower inhibition of Gram-negative bacteria, they are used in combination with acids or chelating agents, and their ability to inhibit antibiotic resistance, being an anti-biofilm agent, makes them a promising agent for surface decontamination [50].

2.4. Organic Acids

Organic acids and their derivatives cause an alteration of pH, the acidification of the cytoplasm impacting the acid-base equilibrium and damaging homeostasis, interfere with gene expression, and hamper cellular metabolism [62][63]. Apart from inhibiting cell activity, organic acids against spore germination have also been reported [64][65]. Davidson, Taylor, and David [64] have suggested the role of the dissociation (proton donation) of organic acids, their ability to generate and transport energy, and inhibit the uptake of nutrients to inhibit the growth of microorganisms. Some recent ones have also reported the inclusion of organic acids in combination due to their synergistic interactions, causing a higher microbial inhibition, which was possibly due to different acid dissociation rates varying the pH [66][67][68]. Organic acids are obtained by different metabolism processes, such as fermentation, oxidation and synthesis [67].
Yadav and Roopesh [69] demonstrated that the spraying of organic acids (lactic or gallic acids) reduced Salmonella typhimurium by more than 3.5 log (CFU/cm2). Furthermore, a combination of organic acids with a non-thermal technique (atmospheric cold plasma for 30 s) enhanced the microbial inhibition. Organic acids (lactic and gallic acid at 5 to 15 mM) caused the permeabilization of the cell membrane and induced oxidation, causing cell lysis [69]. Citric acid, a commonly used organic preservative, has a reported development of sour taste. Hence, Bou et al. [70] evaluated citric acid in an encapsulated form on ready-to-eat patties from sea bass fillets. The application in an encapsulated form improved their sensory quality. The immersion of cod in citric (5%), lactic (5%) and capric (5%) acid solution inhibited Pseudomonas spp., lactic acid bacteria, Brochothrix thermosphacta, Photobacterium spp. and hydrogen sulfide, producing bacterial counts [68]. The suggested methods of the application of organic acids have an impact on their antimicrobial activity. Dipping seer fish steaks in sodium-acetate (2%) inhibited the total mesophilic and total psychrotrophic viable counts for 24 days of storage [71]. It was attributed that the lower molecular weight of organic acid inhibited microbial counts, extending the shelf-life by an additional 9 days over the control samples. Recently, SaeidAsr et al. [72] evaluated the effects of a carboxymethyl cellulose coating with essential oils (rosemary) with sodium acetate (2%) on the shelf-life of rainbow trout fillets. The coating containing sodium acetate significantly inhibited the total viable counts, psychrotrophic bacteria, lactic acid bacteria and Enterobacteriaceae over the control and carboxymethyl cellulose. The contradictory growth of Pseudomonas spp. increased in the sodium acetated treatment. Positive impacts on the water holding capacity and cooking yield were found to be improved by the sodium-acetate-treated sample due to the reduced pH of the treated samples. Furthermore, the general impacts of microbial metabolites on fishery and fish products are summarized. The application of acetic acid (1%) significantly inhibited the total plate count (>2 Log CFU/g), extending the shelf-life by 3 days. Additionally, the inclusion inhibited lipid oxidation (PV by >25 meq O2/kg and TBA by >1.5 mg malondialdehyde/kg) [73]. However, a further combination with chitosan improved the inhibition levels. The inclusion of acetic acid (0.005–0.01%) enhanced the sensory score for pacific white shrimp freshly added and for 12 days of the storage period [74]. Further, their inclusion with other preservatives enhanced microbial (Psychrophilic bacteria, H2S-producing bacteria, Enterobacteriaceae count) inhibition and quality retention (pH, TVB and TBARS). Organic acids (0.02–5%) have been widely applied for preservation in FFPs and exhibited promising results. Their application method and concentration hampers the sensory quality [75]. The application of organic acids at lower levels, usually below 1%, in combination with other preservative methods are found economical and effective [64].

2.5. Other Metabolites

Recently, few have been reported on the utilization of LAB as bioprotective cultures or their metabolites (mainly nisin) as biopreservatives for seafood products’ shelf-life extension. In this context, sixteen LAB were isolated from the intestine of Oreochromis spp. and investigated for their anti-listeria activity [76]. Among the sixteen isolates, thirteen isolates showed an inhibitory zone on the agar plate inoculated with Listeria monocytogens. Furthermore, these microbial isolates were tested in their different forms, including live cells, cell-free supernatant (CFS), alkaline CFS, and heated CFS against L. monocytogens. The results indicated that anti-listeria activities occurred by both heat-stable and sensitive compounds, as well as in live cells [76]. Wiernasz et al. [77] investigated six different LAB cultures for the biopreservation of salmon gravlax during 25 days of storage at 8 °C using vacuum packaging. Three of the strains, including Carnobacterium maltaromaticum SF1944, Lactococcus piscium EU2229, and Leuconostoc gelidum EU2249, were competitive in microbial growth, possessing antimicrobial activities against spoilage microorganisms, as well as producing their own metabolic activity. On the other hand, Vagococcus fluvialis CD264, Carnobacterium inhibens MIP2551 and Aerococcus viridans SF1044 were weak competitors, showing weak antimicrobial activities and produced less metabolic activity. However, among all these strains, C. maltaromaticum SF1944 showed the highest anti-listeria activity and produced lowered volatilome. In addition, V. fluvialis CD264 was capable of preserving the sensory properties and extending the shelf-life beyond 25 days of storage [77]. Previously , Wiernasz et al. [23] selected those six LAB strains from 35 different LAB strains, which showed antimicrobial activity, a tolerance to super-chilling and chitosan coating, no antibiotic resistance, and histamine production capacity. Additionally, the biopreservative effects of these six strains were investigated in cod and salmon products alone or in combination with different hurdles, including chitosan coating, super-chilling and modified atmosphere packaging. However, the efficacy of each strain in protecting the quality of cod or salmon was dependent on the type of fish product and the combination of hurdles used [23].
Aymerich, Rodríguez, Garriga, and Bover-Cid [78] reported that Lactobacillus sakei CTC494 from a meat origin effectively inhibited the spoilage and pathogenic bacteria, and retained the quality of cold-smoked salmon compared to the indigenous LAB strains isolated from same product. However, another was reported that Lactococcus piscium EU2241 effectively inhibited the off-odor released by the Brochothrix thermosphacta and Serratia proteamaculans bacteria in cold-smoked salmon when compared to Leuconostoc gelidum EU2247, Lactobacillus sakei EU2885, and Staphylococcus equorum S030674 [79]. Delcarlo, Parada, Schelegueda, Vallejo, Marguet, and Campos [80] reported that among 132 LAB isolated from mussels of the Argentine coast, only 22 isolates showed anti-bacterial activities against Listeria innocua and L. plantarum. Interestingly, all 22 isolates belong to the Enterococcus mundtii strains, which were confirmed by 16Sr RNA gene phylogenetic analyses. Among the selected isolates, E. mundtii Stw38 possesses a higher growth rate and bacteriocin production at 4 °C. When E. mundtii Stw38 was applied on fish paste and stored at 4 °C, Stw38 successively survived and lowered the microbiota of fish paste [80]. The combination of the two LAB strains, Lactobacillus plantarum AB-1 and Lactobacillus casei, was investigated for its synergistic effect against spoilage microorganisms and the quality control of shrimp (L. vannamei) during refrigerated storage [81]. The results indicated that the synergistic effect significantly enhanced the antimicrobial activity of L. plantarum AB-1 via regulating the AI-2/LuxS quorum sensing system. When shrimps were treated with the co-inoculation of L. plantarum AB-1 and L. casei and stored for 10 days in the refrigerator, the total volatile basic nitrogen and pH of the samples significantly lowered and the spoilage organism (mainly Shewanella baltica) were significantly inhibited [81]. In another, the combination effect of Lactococcus piscium CNCM I-4031 and Carnobacterium divergens V41 was investigated for the safety and quality control of peeled and cooked shrimp (Penaeus vannamei) during storage at 8 °C for 28 days [82]. The results indicated that there was no synergistic effect of both cultures in controlling the spoilage microorganisms and the co-culture had the same antimicrobial effect as C. divergens V41 alone. However, C. divergens V41 produced its own metabolic activity which significantly affected the sensory properties of the product. In addition, the L. piscium CNCM I-4031 effectively eliminated the activity produced by C. divergens V41 in a synergistic effect, thereby maintaining the sensory properties of the shrimp product. Hence, the use of the combination of L. piscium CNCM I-4031 and C.divergens V41 was recommended for the safety and quality control of shrimp [82]. The multi-bacteriocinogenic Lactobacillus curvatus BCS35 culture isolated from the marine origin showed higher antimicrobial activity and stability at 0–2 °C and was used for the biopreservation of fresh young hake (Merluccius merluccius) and megrim (Lepidorhombus boscii) fish [83]. Additionally, the L. curvatus BCS35 culture and cell-free supernatant both significantly lowered spoilage and foodborne pathogenic bacteria, as well as maintained the sensory properties of both fresh fish during refrigerated storage of 14 days [83]. Overall, LAB competes with spoilage or pathogenic organisms for nutrition consumption and renders them dormant. Additionally, LAB secreted metabolites destroy the spoilage or pathogenic microorganisms.


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