Correction: Stante et al. Four Novel Caudoviricetes Bacteriophages Isolated from Baltic Sea Water Infect Colonizers of Aurelia aurita. Viruses 2023, 15, 1525

Figure/Table Legend

In the original publication [1], there was a mistake in the legend for Figures 1 and 2 and Table 4. The host of the phage KMM1 is a Staphylococcus and not a Pseudomonas, as stated initially. Staphylococcus sp. has a new NCBI accession number (PQ151711). The correct legend appears below.

• Figure 1. Plaque and virion morphology of isolated bacteriophages KMM1-KMM4. (A) Plaque morphologies were detected on MB double-agar layer plates after 16 h of incubation at 30 °C. Plaques formed on a lawn of Staphylococcus sp., PQ151711 (KMM1), Citrobacter freundii, OQ398153 (KMM2), and Citrobacter sp., OQ398154 (KMM3, KMM4). Scale bars represent 1 mm. (B) Transmission electron micrographs of phage lysates KMM1–KMM4, scale bars represent 50 nm.
• Figure 2. Infection cycles of isolated phages. One-step growth curves over 120 min were performed to calculate the latent period (green arrow) and burst size (orange arrow). (A) KMM1-infected Staphylococcus sp. (PQ151711) after 27 min with the release of 55 pfu/cell, (B) KMM2-infected Citrobacter freundii (OQ398153) after 20 min with the release of 280 pfu/cell, (C) KMM3- and (D) KMM4-infected Citrobacter sp. (OQ398154) after 45 and 30 min, respectively, with the release of 60 and 120 pfu/cell, respectively. Values represent the mean of three biological replicates.
• Table 4. Adsorption dynamics of bacteriophages KMM1–KMM4. Adsorption rates were determined 5 min after phage addition to the primary hosts (Staphylococcus sp., Citrobacter freundii, and Citrobacter sp.). The number of phages adsorbed to the cells generated a decrease in phage titer. The percentage of adsorbed phages and the adsorption constant (k) were calculated. Values are the mean of three biological replicates with corresponding standard deviations.

Error in Figure/Table

In the original publication, there was a mistake in the graphical abstract as published. Initially, the host of the KMM1 phage was reported as a Pseudomonas strain, based on a 97% sequence identity from a preliminary genetic analysis. However, after conducting more extensive tests at the DSMZ using MALDI-TOF, 16S rRNA sequencing, and microscopy, we confirmed that the correct host is a Staphylococcus strain, with a 99% sequence identity. The corrected graphical abstract appears below.

• Graphical abstract

In the original publication, there was a mistake in Table 1 as published. Strains No. 8, 9, and 170, after being re-sequenced, were found to be Staphylococcus spp. In addition, isolate No. 8 has a new NCBI accession number (PQ151711). The corrected

Table 1. Bacterial strains used in this study. Bacterial strains were isolated in the study [22]. Isolates are sorted by the last column and phylum level. The column “Use in This study” refers to the use of the strains in the study. If not stated differently, the listed numbers in column “Reference” reflect NCBI Accession Numbers.

Strain No.	Strain	Reference	Phylum	Class	Order	Family	Source	Growth Medium	Growth Temp.	Use in This Study
74	Micrococcus luteus	MK967048.1	Actinomycetota	Actinomycetia	Micrococcales	Micrococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
75	Arthrobacter sp.	MK967049.1	Actinomycetota	Actinomycetia	Micrococcales	Micrococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
83	Gordonia terrae	MK967057.1	Actinomycetota	Actinomycetia	Mycobacteriales	Gordoniaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
15	Sulfitobacter sp.	MK967015.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
20	Sulfitobacter pontiacus	MK967020.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
23	Sulfitobacter sp.	MK967023.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
69	Rhodobacter sp.	MK967043.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	M. leidyi Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
78	Sulfitobacter sp.	MK967052.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
86	Ruegeria sp.	MK967060.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
89	Ruegeria sp.	MK967063.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
100	Sulfitobacter sp.	MK967074.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
117	Ruegeria mobilis	MK967091.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	A. aurita polyp North Atlantic husbandry	Marine Bouillon	30 °C	enrichment/ first screening
147	Phaeobacter gallaeciensis	MK967120.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	enrichment/ first screening
188	Sulfitobacter pseudonitzschiae	MK967160.1	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	enrichment/ first screening
13	Bacillus cereus	MK967013.1	Bacillota	Bacilli	Bacillales	Bacillaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
16	Bacillus sp.	MK967016.1	Bacillota	Bacilli	Bacillales	Bacillaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
17	Bacillus cereus	MK967017.1	Bacillota	Bacilli	Bacillales	Bacillaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
19	Bacillus sp.	MK967019.1	Bacillota	Bacilli	Bacillales	Bacillaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
76	Bacillus weihenstephanensis	MK967050.1	Bacillota	Bacilli	Bacillales	Bacillaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
85	Staphylococcus warneri	MK967059.1	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
88	Staphylococcus sp.	MK967062.1	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
73	Enterococcus casseliflavus	MK967047.1	Bacillota	Bacilli	Lactobacillales	Enterococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
24	Maribacter sp.	MK967024.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
57	Olleya marilimosa	MK967032.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
79	Olleya sp.	MK967053.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
181	Chryseobacterium sp.	MK967154.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Weeksellaceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	enrichment/ first screening
257	Chryseobacterium sp.	MK967218.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Weeksellaceae	M. leidyi Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
22	Pseudolateromonas sp.	MK967022.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
91	Pseudoalteromonas prydzensis	MK967065.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
101	Pseudoalteromonas issachenkonii	MK967075.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
167	Pseudoalteromonas sp.	MK967140.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	enrichment/ first screening
203	Pseudoalteromonas espejiana	MK967174.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	enrichment/ first screening
219	Pseudoalteromonas tunicata	MK967188.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
224	Pseudoalteromonas lipolytica	MK967191.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Pseudoalteromonadaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
105	Shewanella basaltis	MK967079.1	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Shewanellaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
21	Cobetia amphilecti	MK967021.1	Pseudomonadota	Gammaproteobacteria	Oceanospirillales	Halomonadaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
55	Marinomonas hwangdonensis	MK967030.1	Pseudomonadota	Gammaproteobacteria	Oceanospirillales	Oceanospirillaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
222	Marinomonas pontica	MK967189.1	Pseudomonadota	Gammaproteobacteria	Oceanospirillales	Oceanospirillaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
262	Oceanospirillaceae bacterium	MK967222.1	Pseudomonadota	Gammaproteobacteria	Oceanospirillales	Oceanospirillaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
11	Pseudomonas sp.	MK967012.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
90	Pseudomonas putida	MK967064.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
92	Pseudomonas putida	MK967066.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
93	Pseudomonas sp.	MK967067.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
94	Pseudomonas sp.	MK967068.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
132	Pseudomonas fluorescens	MK967106.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	enrichment/ first screening
196	Pseudomonas syringae	MK967168.1	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	enrichment/ first screening
77	Vibrio anguillarum	MK967051.1	Pseudomonadota	Gammaproteobacteria	Vibrionales	Vibrionaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
80	Vibrio anguillarum	MK967054.1	Pseudomonadota	Gammaproteobacteria	Vibrionales	Vibrionaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
18	Staphylococcus aureus	OQ398157	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
134	Staphylococcus aureus	OQ398164	Bacillota	Bacilli	Bacillales	Staphylococcaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	enrichment/ first screening
87	Staphylococcus aureus	OQ398160	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	enrichment/ first screening
14	Staphylococcus warneri	OQ398156	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening
6	Citrobacter freundii	OQ398153	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening/ host range
7	Citrobacter sp.	OQ398154	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening/ host range
8	Staphylococcus aureus	PQ151711	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	enrichment/ first screening/ host range
62	Sulfitobacter pontiacus	OQ398158	Pseudomonadota	Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	host range
97	Shewanella sp.	OQ398161	Pseudomonadota	Gammaproteobacteria	Alteromonadales	Shewanellaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	host range
199	Staphylococcus aureus	OQ398168	Bacillota	Bacilli	Bacillales	Staphylococcaceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	host range
DSMZ 11823	Staphylococcus aureus	DSMZ 11823	Bacillota	Bacilli	Bacillales	Staphylococcaceae	clinical material	Trypticase Soy Yeast Broth	37 °C	host range
67	Staphylococcus aureus	OQ398159	Bacillota	Bacilli	Bacillales	Staphylococcaceae	M. leidyi Baltic Sea husbandry	Marine Bouillon	30 °C	host range
102	Staphylococcus aureus	OQ398162	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	host range
158	Staphylococcus aureus	OQ398165	Bacillota	Bacilli	Bacillales	Staphylococcaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	host range
161	Staphylococcus aureus	OQ398166	Bacillota	Bacilli	Bacillales	Staphylococcaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	host range
127	Staphylococcus aureus	OQ398163	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita polyp North Atlantic husbandry	Marine Bouillon	30 °C	host range
DSMZ 28319	Staphylococcus epidermidis	DSMZ 28319	Bacillota	Bacilli	Bacillales	Staphylococcaceae	catheter sepsis	Trypticase Soy Yeast Broth	37 °C	host range
DSMZ 20328	Staphylococcus hominis	DSMZ 20328	Bacillota	Bacilli	Bacillales	Staphylococcaceae	human skin	Trypticase Soy Yeast Broth	37 °C	host range
DSMZ 100616	Staphylococcus warneri	DSMZ 100616	Bacillota	Bacilli	Bacillales	Staphylococcaceae	cleanroom facility, TAS	Trypticase Soy Yeast Broth	30 °C	host range
DSMZ 12643	Streptococcus mitis	DSMZ 12643	Bacillota	Bacilli	Lactobacillales	Streptococcaceae	oral cavity, human	Trypticase Soy Yeast Broth	37 °C	host range
DSMZ 20523	Streptococcus mutans	DSMZ 20523	Bacillota	Bacilli	Lactobacillales	Streptococcaceae	carious dentine	Trypticase Soy Yeast Broth	37 °C	host range
296	Citrobacter braakii	OQ398170	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	A. aurita polyp North Atlantic husbandry	Marine Bouillon	30 °C	host range
283	Citrobacter freundii	OQ398169	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	host range
321	Citrobacter freundii	OQ398172	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	Artifical Seawater 30 PSU	Marine Bouillon	30 °C	host range
313	Citrobacter sp.	OQ398171	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	Artifical Seawater 18 PSU	Marine Bouillon	30 °C	host range
DSMZ 18039	Escherichia coli	DSMZ 18039	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	unknown source	Luria-Bertani Bouillon	37 °C	host range
strain 8	Escherichia coli	[47]	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	unknown source	Luria-Bertani Bouillon	37 °C	host range
DSMZ 30083	Escherichia coli	DSMZ 30083	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	urine	Luria-Bertani Bouillon	37 °C	host range
DSMZ 13698	Escherichia fergusonii	DSMZ 13698	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	faeces of 1-year-old boy	Luria-Bertani Bouillon	37 °C	host range
strain 27	Klebsiella oxytoca	Prof. Dr. Podschun, (National Reference Laboratory for Klebsiella species, Kiel University)	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	unknown source	Nutrient Broth	30 °C	host range
DSMZ 30104	Klebsiella pneumoniae	DSMZ 30104	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	unknown source	Nutrient Broth	30 °C	host range
DSMZ 4782	Shigella flexeneri	DSMZ 4782	Pseudomonadota	Gammaproteobacteria	Enterobacterales	Enterobacteriaceae	unknown source	Caso Bouillon	37 °C	host range
DSMZ 1707	Pseudomonas aeruginosa	DSMZ 1707	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	unknown source	Caso Bouillon	30 °C	host range
9	Staphylococcus aureus	OQ398155	Bacillota	Bacilli	Bacillales	Staphylococcaceae	A. aurita medusa Baltic Sea	Marine Bouillon	30 °C	host range
170	Staphylococcus aureus	OQ398167	Bacillota	Bacilli	Bacillales	Staphylococcaceae	Artificial Seawater 18 PSU	Marine Bouillon	30 °C	host range
DSMZ 50256	Pseudomonas syringae	DSMZ 50256	Pseudomonadota	Gammaproteobacteria	Pseudomonadales	Pseudomonadaceae	Triticum aestivum, glume rot of wheat	Caso Bouillon	30 °C	host range
24	Maribacter sp.	MK967024.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita medusa Baltic Sea husbandry	Marine Bouillon	30 °C	host range
79	Olleya sp.	MK967053.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita polyp Baltic Sea husbandry	Marine Bouillon	30 °C	host range
98	Olleya marilimosa	MK967072.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	host range
108	Chryseobacterium hominis	MK967082.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	A. aurita polyp North Sea husbandry	Marine Bouillon	30 °C	host range
57	Olleya marilimosa	MK967032.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	M. leidyi Baltic Sea	Marine Bouillon	30 °C	host range
199	Maribacter sp.	MK967170.1	Bacteroidota	Flavobacteriia	Flavobacteriales	Flavobacteriaceae	Artificial Seawater 30 PSU	Marine Bouillon	30 °C	host range

appears below.

In the original publication, there was a mistake in Table 2 as published. Initially, the host of the KMM1 phage was reported as a Pseudomonas strain, based on a 97% sequence identity from preliminary genetic analysis. However, after conducting more extensive tests at the DSMZ using MALDI-TOF, 16S rRNA sequencing, and microscopy, we confirmed that the correct host is a Staphylococcus strain, with a 99% sequence identity. We modified the name of the phage in Staphylococcus phage BSwM KMM1. The corrected

Table 2. Viral genome characteristics and overview of assembly-related metrics.

Phage	NCBI Accession No.	No. of Reads	No. of Filtered Reads	Sequence Coverage	N50	Genome Length (bps)	GC Content (%)	Predicted ORFs	Unknown Proteins
Staphylococcus phage BSwM KMM1	OP902294	4.085	3.214	247.488	17.553	137.386	31.77	259	200
Citrobacter phage BSwM KMM2	OP902295	810	595	74.163	22.118	88.537	39.55	137	94
Citrobacter phage BSwS KMM3	OP902292	837	598	130.676	20.517	49.164	43.17	92	58
Citrobacter phage BSwM KMM4	OP902293	6.433	5.371	544.327	23.894	86.911	39.02	138	100

appears below.

In the original publication, there was a mistake in Figure 3 as published. After re-sequence, strains 8 (NCBI Accession No. PQ151711), 9 (NCBI Accession No. OQ398155), and 170 (NCBI Accession No. OQ398167) were moved to the other Staphylococcus strains. The corrected Figure 3 appears below.

In the original publication, there was a mistake in Figure 4 as published. The wrong KMM1 phage name was used. Phage KMM1’s name has been replaced with Staphylococcus phage BSwM KMM1. The corrected Figure 4 appears below.

Additionally, we would like to indicate that we made the following changes in the text of the manuscript—We replaced the name of “Pseudomonas phage BSwM KMM1” with “Staphylococcus phage BSwM KMM1” in all sections of the manuscript.

In the original publication, there was an error in identifying the primary host of phage KMM1. Initially, the host of phage KMM1 was reported to be a Pseudomonas strain based on 97% sequence identity obtained from preliminary genetic analysis. However, after conducting more extensive testing at DSMZ using MALDI-TOF, 16S rRNA sequencing and microscopy, we confirmed that the correct host was a Staphylococcus strain, with a sequence identity of 99%. The primary host of the Staphylococcus BSwM phage KMM1 is Staphylococcus aureus (strain No. 8 listed in Table 1) and has the following NCBI accession number (PQ151711), which was included in all sections of the manuscript. The corrected Section 3.4 was as follows:

3.4. All Isolated Phages Are Highly Specific and Effective

The KMM1 phage was initially found to infect Staphylococcus sp., while KMM2, KMM3, and KMM4 were shown to infect Citrobacter spp., which are phylogenetically classified in the Staphylococcaceae and Enterobacteriaceae, respectively. The host range of the phages was determined by spot assays on 43 strains (Table 1, column “Use in the study”, category “Host range”) belonging to the same genera, Staphylococcus and Citrobacter.

Furthermore, phages were tested against representatives of Pseudomonadaceae, Enterobacteraceae and Rhodobacteraceae of phylum Proteobacteria, Streptococcaceae of Bacilli, and Chryseobacterium, Olleya, and Maribacter of the abundant class of Flavobacteriia present in the A. aurita-associated microbiota. Bacterial sensitivity to a given bacteriophage was evaluated based on the occurrence of a lysis halo. Additionally, the respective phage efficiency of plating (EOP) was determined with those bacteria showing lysis in the spot tests. EOP for each host bacterium was calculated by comparing it with a score of 10⁹ pfu/mL obtained for the original host infection. As shown by the heatmap in Figure 3, KMM1 infects, in addition to the primary host, 15 additional strains of the Gram-positive family Staphylococcaceae, two of them even with a slightly higher EOP. The phages KMM2, KMM3, and KMM4 showed comparable and narrow host ranges within the genus Citrobacter. However, the observed phage titers and EOP were different as indicated by the color-coding dependent on the value (Figure 3). Phages KMM2 and KMM4 were further able to infect the Enterobacteriaceae bacterium Shigella flexneri. In contrast, phage KMM3 infected two Escherichia coli strains of Enterobacteriaceae. The phages infected none of the Flavobacteriia representatives.

• The corrected paragraph 2–5 of Section 4 was as follows:

In this study, four phages (Staphylococcus phage KMM1, Citrobacter phages KMM2, KMM3, and KMM4) were isolated from the Baltic Sea water column (Kiel fjord) surrounding A. aurita individuals by a cultivation-based approach, infecting previously isolated bacteria, Staphylococcus and Citrobacter, both present in the associated microbiota of A. aurita [21,22]. Phages KMM1, KMM2, and KMM4 showed a clear, roundish plaque morphology, as previously described for most Caudoviricetes with long contractile tails (formerly known as Myovirus-like phages) [103]. Phage KMM3, on the other hand, showed larger plaques with a clear center surrounded by a turbid halo, commonly referred to as a “bull’s eye” plaque [104,105]. The clear halo in the plaque’s center represents the phage’s lytic activity. The turbid ring surrounding the clear halo is formed by accumulating uninfected or partially infected host bacterial cells. These cells can resist phage infection (acquired resistance, defense systems) or have only been partially infected, potentially based on the aging of the bacterial lawn (non-infective after log phase), associated increases in the size of microcolonies making up the bacterial lawn, or because of less general phenomena such as the lysis inhibition phenotype [51,106]. However, it is important to note that phage plaque morphology can vary depending on the specific phage–host system and experimental conditions [107,108].

Citrobacter spp., classified as Gram-negative bacteria, are widely distributed in marine environments, including seawater, sediments, and marine eukaryotes [109–112]. Although little is known about the specific ecological roles of Citrobacter in marine environments, they are known to contribute to the degradation of organic matter [113]. Staphylococcus species in marine habitats play roles in various biological processes, such as biofilm formation and interactions with other marine microbes, and can indirectly contribute to nutrient cycling [114–116]. These bacteria often serve as indicators of pollution and pose public health risks, particularly due to their potential to harbor antibiotic resistance [117–119]. Frequently introduced into marine environments by human activities, both Staphylococcus and Citrobacter can persist and spread, impacting both ecosystem and human health [120,121]. As opportunistic pathogens, they can also cause infections in marine multicellular organisms [110,111,114,122,123]. However, Staphylococcus and Citrobacter species are generally not considered critical for the health of marine ecosystems [124,125]. Their presence in marine habitats is often linked to runoff or sewage discharge from human activities, rather than any significant ecological functions within the marine environment [126,127]. Consequently, virulent phages that infect these bacteria might help balance ecosystem and metaorganism homeostasis. Bacteriophages that target Staphylococcus and Citrobacter have been identified in marine environments and may play important roles in regulating bacterial populations [2,128]. These phages can control the abundance of their host bacteria, potentially limiting the spread of pathogenic or contaminant strains like Staphylococcus aureus and Citrobacter species [2,129]. By modulating the population sizes of these bacteria, phages contribute to microbial community dynamics, influence nutrient cycling, and help maintain ecological balance in marine ecosystems [129].

Moreover, the four isolated phages reflect narrow host range phages, infecting only a limited number of bacterial strains or species [80,130]. This specificity allows them to modulate bacterial populations by selectively limiting certain strains, such as S. aureus, which can otherwise spread uncontrollably and pose risks to marine ecosystems [131]. This targeted regulation is crucial for maintaining ecological balance and preventing the proliferation of potential pathogens [132]. Additionally, these phages can influence horizontal gene transfer by facilitating or inhibiting the movement of genetic material between bacteria, thereby affecting the spread of antibiotic resistance genes [133]. Due to these capabilities, narrow host range phages are valuable not only in natural ecosystems but also as potential tools in phage therapy to combat resistant infections [134,135]. Furthermore, their specificity makes them ideal candidates for bioengineering applications, such as designing targeted antimicrobials or developing biosensors [132,135,136].

All phages identified in this study showed effective and efficient lysis of Staphylococcus and Citrobacter by fast and effective binding of the phage to the host cells, short latency periods, and high burst sizes (Tables 3 and 4). These characteristics are further important features for affecting natural microbiomes and are particularly relevant for potential therapeutic applications. Phage therapy uses intact natural phages or phage compounds to treat bacterial infections [137]. Due to the growing number of antibiotic-resistant bacterial species and the ban on the use of antibiotics in the aquatic environment [78,138–140], the interest in phage therapy particularly for aquaculture increased during the last few decades [141–143]. Phage therapy relies on extraordinary qualities of phages, including host specificity, self-replication, wide distribution, and safety [43,137,142,144]. Since phages are a natural way of managing bacterial infections, their usage does not contribute to the development of antibiotic resistance or the deposition of harmful residues in the environment. Finally, phages are versatile since they may be used alone or in cooperation with antibiotics or other therapies to improve their potency against bacterial infections. These features are entirely applicable in aquaculture, where traditional approaches to deal with pathogenic bacteria, such as antibiotics, are impossible [145,146]. Building on these advantages, the narrow host range of the isolated KMM1-KMM4 phages offers targeted therapeutic options in aquaculture, where specific bacterial infections require precise management [147,148]. These phages are effective against particular strains of Staphylococcus or Citrobacter, allowing for focused intervention without affecting non-target bacteria [129]. Their ability to selectively infect and reduce populations of specific pathogens minimizes the risk of disrupting beneficial microbial communities [136,149]. However, for these phages to be practical in aquaculture, their effectiveness must be verified against further various bacterial strains, and their stability, safety, and cost-effective production under various environmental conditions, such as pH and temperature, need to be thoroughly evaluated.

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Some parts of the text have been added, moved, and/or revised, and we included appropriate citations, with new numbered references [114–121,123–125,128,129,131–136,147–150]. With this correction, the order of some references has been adjusted accordingly.

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In addition, there are some words and content modifications throughout the text. The content of the Supplementary Materials has also been changed accordingly. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.