Loma salmonae (Protozoa

Microspora) infections in seawater reared coho salmon Oncorhynchus kisutch

Michael L. Kent, Diane G. Elliott, Joseph M. Groff, Ronald Hedrick

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Loma salmonae (Putz et al., 1965) infections were observed in five groups of coho salmon, Oncorhynchus kisutch, reared in seawater net-pens in Washington State, U.S.A. in 1984-1986. Ultrastructural characteristics, size of spores, tissues and host infected, and geographical location identified the microsporidium as Loma salmonae. Preserved spores measured 4.4×2.3 (4-5.6×2-2.4) μm and exhibited 14-17 turns of the polar filament. Infections were evident in the gills of some fish before seawater entry, but few parasites were observed and they caused little tissue damage. Infections observed in fish after transfer to seawater were associated with significant pathological changes in the gills. A mixed inflammatory infiltrate was associated with ruptured microsporidian xenomas within the vessels and interstitium of the primary lamellae. Microsporidian spores were dispersed throughout the lesions and were often seen inside phagocytes. The parasite was also observed in the heart, spleen, kidney and pseudobranchs; however, the inflammatory lesions were common only in the heart. Monthly examination of fish after transfer to seawater showed peak prevalences (33-65%) of gill infections during the summer. Although moribund fish were often infected with other pathogens, the high prevalence of L. salmonae infections and the severity of the lesions it caused, suggested that this parasite significantly contributed to the recurrent summer mortalities observed at this net-pen site.

Original languageEnglish (US)
Pages (from-to)211-222
Number of pages12
JournalAquaculture
Volume80
Issue number3-4
DOIs
StatePublished - Sep 1 1989

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Oncorhynchus kisutch
Microsporidia
Protozoa
seawater
lesion
lesions (animal)
net pens
spore
gills
parasite
infection
spores
fish
parasites
heart
phagocytes
summer
Geographical Locations
spleen
vessel

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Loma salmonae (Protozoa : Microspora) infections in seawater reared coho salmon Oncorhynchus kisutch. / Kent, Michael L.; Elliott, Diane G.; Groff, Joseph M.; Hedrick, Ronald.

In: Aquaculture, Vol. 80, No. 3-4, 01.09.1989, p. 211-222.

Research output: Contribution to journalArticle

Kent, Michael L. ; Elliott, Diane G. ; Groff, Joseph M. ; Hedrick, Ronald. / Loma salmonae (Protozoa : Microspora) infections in seawater reared coho salmon Oncorhynchus kisutch. In: Aquaculture. 1989 ; Vol. 80, No. 3-4. pp. 211-222.
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