Loma sp. in salmonids from the eastern united states

Associated lesions in rainbow trout

P. T. Markey, Vicki Suzette Blazer, M. S. Ewing, K. M. Kocan

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A microsporidian of the genus Loma was noted in the gills of rainbow trout Onco-rhynchus mykiss from a state hatchery (Buford Trout Hatchery) in Georgia. Mortalities of varying severity occur at this hatchery every fall, and the microsporidian was noted during an experiment from August 1991 to January 1992 to determine the effects of water source on disease. Infections first appeared to be systemic in the October sample; xenomas were observed in heart, spleen, and peripheral vessel walls. The presence of unidentified intracellular material preceded the appearance of xenomas in all tissues, but whether this material was associated with inflammation or represented immature stages of the parasite has yet to be determined. These structures were also noted in the intestine and liver, although xenomas were not noted in these organs. Mature xenomas did not elicit an inflammatory response but appeared to be short-lived. When the xenoma wall ruptured and released spores, an inflammatory response was again observed. The prevalence and severity of the infection were determined in fish maintained in troughs with well water, Chattahoochee River water, or hatchery (treated river) water. The infection tended to be more prevalent and more severe in fish maintained in the hatchery or river water than in those maintained in the well water. Stress induced by poor water quality may increase mortality from this parasite. This report extends the range of Loma sp. into the eastern United States.

Original languageEnglish (US)
Pages (from-to)318-328
Number of pages11
JournalJournal of Aquatic Animal Health
Volume6
Issue number4
DOIs
StatePublished - Jan 1 1994

Fingerprint

Eastern United States
Salmonidae
hatchery
lesion
lesions (animal)
hatcheries
rainbow
Oncorhynchus mykiss
river water
inflammation
Microsporidia
well water
parasite
infection
parasites
mortality
water
fish
trout
spore

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

Markey, P. T. ; Blazer, Vicki Suzette ; Ewing, M. S. ; Kocan, K. M. / Loma sp. in salmonids from the eastern united states : Associated lesions in rainbow trout. In: Journal of Aquatic Animal Health. 1994 ; Vol. 6, No. 4. pp. 318-328.
@article{ed244220c0804a2b81eb721dfaf229fd,
title = "Loma sp. in salmonids from the eastern united states: Associated lesions in rainbow trout",
abstract = "A microsporidian of the genus Loma was noted in the gills of rainbow trout Onco-rhynchus mykiss from a state hatchery (Buford Trout Hatchery) in Georgia. Mortalities of varying severity occur at this hatchery every fall, and the microsporidian was noted during an experiment from August 1991 to January 1992 to determine the effects of water source on disease. Infections first appeared to be systemic in the October sample; xenomas were observed in heart, spleen, and peripheral vessel walls. The presence of unidentified intracellular material preceded the appearance of xenomas in all tissues, but whether this material was associated with inflammation or represented immature stages of the parasite has yet to be determined. These structures were also noted in the intestine and liver, although xenomas were not noted in these organs. Mature xenomas did not elicit an inflammatory response but appeared to be short-lived. When the xenoma wall ruptured and released spores, an inflammatory response was again observed. The prevalence and severity of the infection were determined in fish maintained in troughs with well water, Chattahoochee River water, or hatchery (treated river) water. The infection tended to be more prevalent and more severe in fish maintained in the hatchery or river water than in those maintained in the well water. Stress induced by poor water quality may increase mortality from this parasite. This report extends the range of Loma sp. into the eastern United States.",
author = "Markey, {P. T.} and Blazer, {Vicki Suzette} and Ewing, {M. S.} and Kocan, {K. M.}",
year = "1994",
month = "1",
day = "1",
doi = "10.1577/1548-8667(1994)006<0318:LSISFT>2.3.CO;2",
language = "English (US)",
volume = "6",
pages = "318--328",
journal = "Journal of Aquatic Animal Health",
issn = "0899-7659",
publisher = "American Fisheries Society",
number = "4",

}

Loma sp. in salmonids from the eastern united states : Associated lesions in rainbow trout. / Markey, P. T.; Blazer, Vicki Suzette; Ewing, M. S.; Kocan, K. M.

In: Journal of Aquatic Animal Health, Vol. 6, No. 4, 01.01.1994, p. 318-328.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Loma sp. in salmonids from the eastern united states

T2 - Associated lesions in rainbow trout

AU - Markey, P. T.

AU - Blazer, Vicki Suzette

AU - Ewing, M. S.

AU - Kocan, K. M.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - A microsporidian of the genus Loma was noted in the gills of rainbow trout Onco-rhynchus mykiss from a state hatchery (Buford Trout Hatchery) in Georgia. Mortalities of varying severity occur at this hatchery every fall, and the microsporidian was noted during an experiment from August 1991 to January 1992 to determine the effects of water source on disease. Infections first appeared to be systemic in the October sample; xenomas were observed in heart, spleen, and peripheral vessel walls. The presence of unidentified intracellular material preceded the appearance of xenomas in all tissues, but whether this material was associated with inflammation or represented immature stages of the parasite has yet to be determined. These structures were also noted in the intestine and liver, although xenomas were not noted in these organs. Mature xenomas did not elicit an inflammatory response but appeared to be short-lived. When the xenoma wall ruptured and released spores, an inflammatory response was again observed. The prevalence and severity of the infection were determined in fish maintained in troughs with well water, Chattahoochee River water, or hatchery (treated river) water. The infection tended to be more prevalent and more severe in fish maintained in the hatchery or river water than in those maintained in the well water. Stress induced by poor water quality may increase mortality from this parasite. This report extends the range of Loma sp. into the eastern United States.

AB - A microsporidian of the genus Loma was noted in the gills of rainbow trout Onco-rhynchus mykiss from a state hatchery (Buford Trout Hatchery) in Georgia. Mortalities of varying severity occur at this hatchery every fall, and the microsporidian was noted during an experiment from August 1991 to January 1992 to determine the effects of water source on disease. Infections first appeared to be systemic in the October sample; xenomas were observed in heart, spleen, and peripheral vessel walls. The presence of unidentified intracellular material preceded the appearance of xenomas in all tissues, but whether this material was associated with inflammation or represented immature stages of the parasite has yet to be determined. These structures were also noted in the intestine and liver, although xenomas were not noted in these organs. Mature xenomas did not elicit an inflammatory response but appeared to be short-lived. When the xenoma wall ruptured and released spores, an inflammatory response was again observed. The prevalence and severity of the infection were determined in fish maintained in troughs with well water, Chattahoochee River water, or hatchery (treated river) water. The infection tended to be more prevalent and more severe in fish maintained in the hatchery or river water than in those maintained in the well water. Stress induced by poor water quality may increase mortality from this parasite. This report extends the range of Loma sp. into the eastern United States.

UR - http://www.scopus.com/inward/record.url?scp=0028327830&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028327830&partnerID=8YFLogxK

U2 - 10.1577/1548-8667(1994)006<0318:LSISFT>2.3.CO;2

DO - 10.1577/1548-8667(1994)006<0318:LSISFT>2.3.CO;2

M3 - Article

VL - 6

SP - 318

EP - 328

JO - Journal of Aquatic Animal Health

JF - Journal of Aquatic Animal Health

SN - 0899-7659

IS - 4

ER -