Case a08 42542
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University of Georgia Department of Pathology. Case # A08-42542. Janildo Reis, Alvin C. Camus, Elizabeth W. Howerth and Cecil Jennings. Signalment & History. Adult robust redhorse sucker ( Moxostoma robustum ). Found dead in tank with no reported clinical signs.

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Case a08 42542

University of Georgia

Department of Pathology

Case # A08-42542

Janildo Reis, Alvin C. Camus, Elizabeth W. Howerth and Cecil Jennings.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Signalment history
Signalment & History

  • Adult robust redhorse sucker (Moxostoma robustum).

  • Found dead in tank with no reported clinical signs.

Picture from American Fisheries Society

http://www.sdafs.org/ncafs/Newsletters/April2000/index.html

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Necropsy findings
Necropsy findings

Catfish with similar lesions.

Multiple white pinpoint nodules throughout the skin of the head.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Microscopic findings
Microscopic findings

Fresh gill clipping: Note typical horseshoe nucleus (trophozoites)

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Microscopic findings1
Microscopic findings

Nodular hyperplasia and dysplasia of the epidermis replacing accessory structures.

Normal skin - accessory structures are present.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Microscopic findings2
Microscopic findings

Epidermal hyperplasia and dysplasia associated with a parasitic structure.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Microscopic findings3
Microscopic findings

Skin: H&E

Gill: H&E

  • 60 to 150 um, round to oval, single cell ciliated protozoan (trophozoite).

  • 1-2 um thick hyaline wall, abundant granular and vacuolated basophilic cytoplasm

  • 20 to 50um deeply basophilic nucleus, in some sections of gills present horseshoe shaped nucleus.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Microscopic findings4
Microscopic findings

  • Secondary findings

  • Gills

    • Hyphae consistent with Saprolegnia spp.

    • Mixed bacterial colonies.

  • Skin

    • Trematode metacercaria encysted in the dermis.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Morphologic diagnosis
Morphologic diagnosis

Skin, head: Severe, nodular, lymphoplasmacytic and hyperplastic dermatitis, with intralesional protozoans, consistent with Ichthyophthirius multifiliis.

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Background information
Background information

  • Disease names: White Spot Disease

    or ichthyophthiriosis(“Ich”)

  • Etiology - Ichthyophthirius multifiliis

    • Obligate parasite

    • Large ciliated protozoan with characteristic horseshoe shaped nucleus

    • One of the most common freshwater parasite

    • Mortalities may reach 100%

  • Clinical signs and lesions:

    • Pinpoint white nodules widely distributed

      • Body surface and gills

    • Signs of hypoxia

      • Increased respiratory rate, lethargy and “flashing”

  • Life cycle is temperature dependent - important to treatment

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Life cycle
Life cycle

Trophozoite

Theronts

Tomites

Tomont

http://parasitology.informatik.uni-uerzburg.de/login/n/h/0702.html

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only


Questions
Questions?

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only

Rio de Janeiro


Red black rocks
Red & Black Rocks!!

Bulldogs

Flamengo

Thank you!

Presented at SEVPAC 2008 – Permission granted for use on SEVPAC website only