Fish diseases Flashcards
Etiological agent of velvet disease
Piscinoodium pillulare
Lifecycle of piscinoodium pillulare
Dinospores infect fish, then turn into trophonts. Trophonts leave fish and become tomonts
Etiological agent of Ich
Ichthyophthirius multifiliis
C/S of ich
Excess mucus, labored breathing, leth. White raised nodules on skin
Ich histological hallmark
Horseshoe-shaped macronucleus
What’s the only significant virus in fish?
Lymphocystis (Iridovirus)
Pathognomonic lesion for Lymphocystis
Hypertrophic fibroblasts
C/S of lymphocystis
Raised, white, waxy lesions
Etiological agent of neural microsporidiosis
Pseudoloma neurophilia
c/s of pseudoloma
emaciation, spinal curvature
Tx for microsporidiosis
Fumagillin
Etiological agent of capillariasis
Pseudocapillaria tomentosa
c/s of capillariasis
dark, emaciated, lethargic. Cellulitis of affected region
ID of P. tomentosa
Oval, bioperculate eggs
tx of P. tomentosa
Ivermectin? Levamisole, fenbendazole
Etiological agent of hole in the head disease
Edwardsiella ictaluri
C/S of gliding bacteria (Flavibacterium, Flexibacter) spp
Fin and tail rot, surface infections, bacterial gill disease
Etiologicla agent of Costiasis
Ichthyobodo necatrix
Four protozoal agents that affect fish
Piscinoodium pillulare Ichthyophthirius multifilis Ichthyobodo necatrix Trichodina Pseudoloma neurophilia
2 species of trematodes
Gyrodactylus
Dactylogyrus
Cause of nephrocalcinosis
High CO2 or excess Ca or Mg in diet
Most common spontaneous neoplasm
Seminoma
Which organism can be a promoter of GI adenocarcinoma?
Pseudocapillaria tomentosa
How to differentiate goiter from thyroid tumor?
Histo
When does goiter occur?
When diets in environment are low in iodine or when goitrogenic chemicals are present
Where do spindle cell sarcomas form?
Viscera, skeletal muscle behind the eye (causing exophthalmia)
2 species of trematodes
Gyrodactylus
Dactylogyrus
Cause of nephrocalcinosis
High CO2 or excess Ca or Mg in diet
Most common spontaneous neoplasm
Seminoma
Which organism can be a promoter of GI adenocarcinoma?
Pseudocapillaria tomentosa
How to differentiate goiter from thyroid tumor?
Histo
When does goiter occur?
When diets in environment are low in iodine or when goitrogenic chemicals are present
Where do spindle cell sarcomas form?
Viscera, skeletal muscle behind the eye (causing exophthalmia)
