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Summary Parasites of freshwater fish
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Summary of the main types of parasites of freshwater fish, across many taxa, including protozoa, trematodes and cestodes. Also includes common symptoms of each infection
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Parasites of freshwater fishProtozoa
Ciliates
- Site of infection is usually the intestine, gills, skin and fins
- Symptoms include skin and gill irritation, white spot, excessive mucus secretion in gill,
enlarged eye
- Taxa: Ichthyopthirius, Chilodonella, Tetrahymena, Trichodina, Epistylis
Flagellates
- Parasites of the intestine, stomach, skin, gills and fins
- Main symptom is mucous secretion
- Taxa: Hexamita, Ichthyobodo, Piscinoodinum, Cryptobia
Microsporideans
- Infect the swim bladder, kidneys, viscera, and form cysts in lymph
- Symptoms include hypertrophy of tissues, thickening of kidney walls and formation of
tumour-like masses in the tissues
- Taxa: Plestophora, Enterocytozoans, Glugea
Myxozoans
- Indicative features are cysts in muscles, connective tissues, epithelial lining of bladder,
kidney tubules and gut lining
- Infection causes hypertrophy of cells, and formation of tumour-like masses in tissue
- Taxa: Myxozoma, Mitraspora, Thelohanellus, Myxobolus
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