Latin name: Hexamita (Octomitus) truttae Other names: Octomitus Pathogen:
Microscopic examination of the intestines and gallbladder show the Hexamita (Octomitus) truttae flagellar parasites. They are teardrop-shaped, 10-12 micrometers long, with 4 pair of flagella in front of it and 1 behind.,
Fish feed well, but are skinny,
Rectum and bladder are partially fallen out
Sick fish do not show loss of appetite, but become emaciated. The anus is inflamed, the rectum and bladder will sometimes partially fall out. Stringy feces can be observed. Usually fish will die. Microscopic examination of the intestines and gallbladder will show the parasites.
This is an infectious disease, caused by the teardrop-shaped flagellate Hexamita (Octomitus) truttae, 10-12 microns in length, with four pairs of flagella (3 pairs - at the font, 1 - at the back). It affects the gallbladder and intestines. It is brought into the aquarium inhabited by Salmonidae with feed, plants and gravel (if it has not been boiled or tempered) as well as with fish, equipment and water from a contaminated aquarium.
How to cure:
Sick fish are treated in a separate tank with Erythrocycline (40-50 mg/L) used concurrently with griseofulvin or trichopol (10 mg/L) for 10 to12 days. Calomel can be added to dry food for 4 days (0.5 g per 250 g of food).
The flagellate does not survive temperature of 35C (95F). Therefore, it can be eradicated by maintaining water temperature at this level for 1-2 days. However, not all fish species tolerate this temperature.
Metronidazole can also prove effective at the dose of 250 mg per 40L of water, with water change carried out 6 times every 8 hours.