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Common carp, pond
Clinic: multiple whitish nodules on skin, non-lethal
temperature dependant, clinical symptoms mainly in spring,
later regression
F03/4542
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Papillomatous hyperplasia
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Spongiosis
No goblet or clubb cells
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Hydropic degeneration
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Exocytosis of
mainly lymphocytes
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Carp pox, Epithelioma papillosum carpio
Morphological diagnosis
Skin, epidermal hyperplasie, multifocal, severe
Aetiology
Herpesvirus cyprini (Cyprinid herpesvirus 1)
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Fi227/98
Ornamental fish, freshwater aquaria
Clinic: non-lethal, multiple white nodules on skin and fins
Organs: skin, fins
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Epidermis
Dermis
Fibroblasts
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Nucleus
Web-like intracytoplasmatic
inclusion bodies
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Morphological diagnoses
Skin, fibroblast hypertrophy with intracytoplasmatic inclusion bodies,
multifocal, severe
Skin, lymphohistiocytic dermatitis, multifocal, chronic, mild
Aetiology
Lymphocystis Disease Virus, Iridovirus
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Neoplasia
F09/629
Koi, pond
Clinic: Only single animals
affected, incomplete
closure of operculum
Organ: gills
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Cartilage
Capillaries
Epithelial cells
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Blast cells
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Infiltration with lymphocytes, macrophages, few eosinophilic
granular cells
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Morphological diagnosis
Gills, branchioblastoma
Prognosis
Neoplasia: benign
Localisation and expansive growth leads to malfunction of gills
lethal
Usually surgery not possible
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F01/2354
Feral grayling
Clinic: silver nodule on skin
Organ: skin
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Morphological diagnosis
Skin, iridophoroma
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F08/2311
Rainbow trout, fish farm
Clinic: non-lethal, low morbidity
Rainbow trout > 100 g, single to multiple reddish to whitish nodules on
body site
Organ: skin
Miscellanous disorders
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Epidermis
Scale pockets
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Lymphocytes, macrophages
erythrocytes, fibrin
Multinucleated giant cells
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Morphological diagnosis
Skin, granulomatous dermatitis, focal extensive, severe, chronic with
scale resorption
Red mark syndrome (Cold water strawberry disease)
Aetiology unknown, RLO in discussion
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F09/2062
Koi, pond
Clinic: no clinical signs, only single animals affected
Organ: gonads
Macroscopic picture of a Common Roach
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Spermatocytes a
Spermatogonia b
Spermatocytes b Spermatids
Spermatogonia a
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Primary oocyte / perinucleolar stage
Mature oocyte
Oogonia
Vitellogenic stage
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Morphological diagnosis
Ovotestis, lobular form
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Ovotestis (Intersex) in gonochoristic fish
Definition intersex:
• Gonads with male and female compartments
Forms:
• Lobular form
• Mosaik form
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Ovotestis lobular form:
two separate compartments of male and female gonadal tissue
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Diskussion - Ovotestis Ovotestis mosaik form:
Oozytes multifocally distributed in testicular tissue
Testicular structure preserved
Most common intersex-form
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Occurrence only occasionally
Exception: pollution with oestrogenic substances
Etiology:
Hormonal active substances (esp. oestrogenic active), e.g. industry
Incidental
Normal, endogenous variance
Hormonal active neoplasms
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