Name: Lactococcus piscium Williams et al. 1990

Category: Species

Proposed as: sp. nov.

Etymology: pis’ci.um. L. gen. masc. n. piscis, fish; L. gen. masc. pl. n. piscium, of fishes

Pronunciation (Latin), gender: … PIS-ki-um, masculine

Type strain: ATCC 700018; CCUG 32207; CCUG 32732; CECT 4493; CIP 104371; DSM 6634; HR1A-68; HRIA 68; JCM 11055; JCM 16647; NCFB 2778; NCIMB 13196

Conduct genome-based taxonomy at

16S rRNA gene: DQ343754 Analyse FASTA

Effective publication: Williams AM, Fryers JL, Collins MD. Lactococcus piscium sp. nov. a new Lactococcus species from salmonid fish. FEMS Microbiol. Lett. 1990; 68:109-114. 🇬🇧

IJSEM list: Anonymous. Validation list no. 34. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1990; 40:320-321.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Pseudolactococcus piscium (Williams et al. 1990) Abe et al. 2025

Risk group: 1

• Synonyms:

  • Name	Kind
    Pseudolactococcus piscium (Williams et al. 1990) Abe et al. 2025	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Lactococcus piscium is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Lactococcus.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1. — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 64 times in PubMed until 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the genus.

Parent taxon: Lactococcus Schleifer et al. 1986

Assigned by: Williams AM, Fryers JL, Collins MD. Lactococcus piscium sp. nov. a new Lactococcus species from salmonid fish. FEMS Microbiol. Lett. 1990; 68:109-114. 🇬🇧

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Record number: 777425