Choose one of the following:
Skin flukes, gyrodactylus, monogenetic flukes, flatworms
+2
- the fish scrapes itself against objects
- rapid gill movement
- mucus covering the gills or body
- the gills or fins may be eaten away
- the skin may become reddened
Fish leeches, Hirudinea, Piscicola geometra
+1
- visible curled up worms attached to the fish
Lernaea, anchor worm, copepodes, copepod crustacean
+4
- visibile 20 mm long parasite attached to the fish
Camallanus (Nematode)
+1
- worms hanging from the anus
- the fish can become severely emaciated or the opposite: the abdominal cavity becomes bloated
Carp/fish louse, Argulus
+2
- the fish scrapes itself against objects
- clamped fins
- visible parasites are visible on the body of the fish
Woodlice, pillbugs, isopods
+0
- visible parasites (up to 3 cm long) - for the ectoparasitic species of isopods
- small openings in the fish's skin through which the parasites obtain breathing water - for the endoparasitic species of isopods
Microsporidia
+1
- cysts of up to 10 mm in the intestines, the swim bladder wall and the connective tissue (if the cysts form in the skin tissue, they look like large whitish cloudy blisters and are of hard consistency)