Scanning Electron Microscopic Studies of the Life Cycle of Ichthyophthirius multifiliis

McCartney, Jerald Barton.; Fortner, G W; Hansen, M. F.

doi:10.2307/3281906

Cited by 21 publications

(13 citation statements)

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“…trophont), parasitic stage; and cyst (from tomont to tomocyst), reproductive stage (McCartney et al . ). Still, it can simply be divided into two stages (Ewing and Kocan ): the vegetative growth (parasitic) stage in which I. multifiliis stores energy in the parasitic type, trophonts; and reproductive (nonparasitic or free‐living) stage in which I. multifiliis displays various individuals successively including tomont, tomocyst, tomites and theronts (Fig.…”

Section: Biology Of Ichthyophthirius Multifiliismentioning

confidence: 97%

“…Although only one host is needed, the life cycle is a little complicated in contrast to most other species of ciliates and generally divided into three stages: tomite (exactly from tomite to theront by now), infective stage; trophozoite (i.e. trophont), parasitic stage; and cyst (from tomont to tomocyst), reproductive stage (McCartney et al 1985). Still, it can simply be divided into two stages (Ewing and Kocan 1992): the vegetative growth (parasitic) stage in which I. multifiliis stores energy in the parasitic type, trophonts; and reproductive (nonparasitic or free-living) stage in which I. multifiliis displays various individuals successively including tomont, tomocyst, tomites and theronts ( Fig.…”

Section: Life Cycle Of Ichthyophthirius Multifiliismentioning

confidence: 99%

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Ichthyophthiriasis: emphases on the epizootiology

Wei

2013

Lett Appl Microbiol

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Ichthyophthiriasis (white spot disease) is an economically important protozoosis caused by Ichthyophthirius multifiliis in freshwater fish. Medication prevention and curation are the main methods to control this disease with vaccines in laboratory, but the efficacy of drugs practically acts on the freeliving (nonparasitic) stage of I. multifiliis and can be easily impaired by a variety of environmental factors. Thus, study on the biological properties of I. multifiliis and the complicated ecological relationships between I. multifiliis and other biotic or abiotic factors that influence epidemicity of ichthyophthiriasis will contribute to integrated control of ichthyophthiriasis. In this article, some I. multifiliis biological properties, such as systematic position and life cycle of I. multifiliis, are briefly reviewed, and the seemingly abnormal phenomenon associated with in vitro cultures is specially discussed; then, the epizootiology of ichthyophthiriasis is emphasized, which involves various biotic or abiotic factors that impact the life and action of I. multifiliis. The susceptibility and stress reaction of fish to I. multifiliis infection are stated. Also, the pathogenicity and diagnosis of ichthyophthiriasis were covered, and an overall assessment is finally made on ichthyophthiriasis control.

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Section: Biology Of Ichthyophthirius Multifiliismentioning

confidence: 97%

Section: Life Cycle Of Ichthyophthirius Multifiliismentioning

confidence: 99%

Ichthyophthiriasis: emphases on the epizootiology

Wei

2013

Lett Appl Microbiol

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“…2-4, 7-9, 14, 15. [20][21][22] and life history studies of this species (e.g. 1, 10, 25) have been reported, the significance of these periods of development for populations of the parasite has not been assessed.…”

mentioning

confidence: 99%

Critical Periods in Development of Ichthyophthirius multifiliis (Ciliophora) Populations¹

Ewing

Lynn

Ewing

1986

The Journal of Protozoology

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ABSTRACT. Three periods in development that strongly influence population dynamics of Ichthyophthirius multifiliis were identified in experimental infections of channel catfish. The first occurred upon establishment within the host, 0 to 10 min postexposure (PE), when the parasite population that gained entrance declined 50%. Survival from 10 to 45 min PE, however, was constant. The second period identified came after I. multifiliis left the host and the free‐living tomont encysted. The third occurred during reproduction. Although survival of encysting tomonts approached 100% among individuals departing after three to five days residence in the host, theront production varied significantly with parasite size, culture temperature during development, and length of residence by the trophont in the host. Theront production per tomont increased daily and on days three, four, and five PE was significantly higher for parasites developing at 24°C than for those at 21°C. At five days PE, mean production was 562 theronts/tomont and 240 theronts/tomont, respectively, and production by tomonts of equal size was greater for parasites maintained at 24°C.

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“…The life stages of the parasite include a reproductive tomont, an infective theront, and a parasitic trophont (MacLennan 1935, McCartney et al 1985, Dickerson & Dawe 1995. A reproductive tomont undergoes multiple divisions to produce 100 to 1000 tomites in each cyst.…”

Section: Introductionmentioning

confidence: 99%

“…Theronts penetrate the epithelium of fin, gill and skin of fish and become feeding trophonts. After leaving the host at maturation, trophonts form reproductive tomonts on an appropriate surface by secreting a cyst wall (MacLennan 1935, McCartney et al 1985.…”

Section: Introductionmentioning

confidence: 99%

Effect of lectins on the invasion of Ichthyophthirius theront to channel catfish tissue

Klesius²,

Shoemaker³

2001

Dis. Aquat. Org.

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Scanning Electron Microscopic Studies of the Life Cycle of Ichthyophthirius multifiliis

Cited by 21 publications

References 4 publications

Ichthyophthiriasis: emphases on the epizootiology

Ichthyophthiriasis: emphases on the epizootiology

Critical Periods in Development of Ichthyophthirius multifiliis (Ciliophora) Populations¹

Effect of lectins on the invasion of Ichthyophthirius theront to channel catfish tissue

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Scanning Electron Microscopic Studies of the Life Cycle of Ichthyophthirius multifiliis

Cited by 21 publications

References 4 publications

Ichthyophthiriasis: emphases on the epizootiology

Ichthyophthiriasis: emphases on the epizootiology

Critical Periods in Development of Ichthyophthirius multifiliis (Ciliophora) Populations1

Effect of lectins on the invasion of Ichthyophthirius theront to channel catfish tissue

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Critical Periods in Development of Ichthyophthirius multifiliis (Ciliophora) Populations¹