Cryptobia

Updated on Feb 05, 2024

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Domain Eukaryota Family Cryptobiidae Higher classification Cryptobiidae		Phylum Euglenozoa Scientific name Cryptobia Rank Genus

Similar Kinetoplastida, Spironucleus, Hexamita, Ichthyobodo necator, Trichodina

Cryptobia iubilans

Cryptobia is a genus of excavates. Several species are known for being fish pathogens. They can be found in other animals, as well. The name Trypanoplasma is occasionally used for some of these.

Cryptobia Cryptobia salmositica Fish Pathogens

Cryptobia sp

Biology

There are 52 species of Cryptobia known from fish. 40 of these live in the blood, 7 in the gut, and 5 on the body surface.

Examples include:

Cryptobia wwwfishhelplinecoukphotoscryptobia1ajpg

Cryptobia branchialis, an ectoparasite that lives on the skin or gills. It can deform the skin and cause anorexia and death.

Cryptobia iubilans, an endoparasite that lives in the intestines and causes granulomatous inflammation of the abdominal organs, resulting in weight loss and death.

Cryptobia salmositica, C. borreli, and C. bullocki, blood parasites that lead to anaemia and lesions in the haematopoietic tissues.

Some Cryptobia parasitize other animal taxa. Examples include:

Cryptobia innominata, a parasite of the snail Triodopsis tridentata.

Diagnosis and treatment

In fish, the disease is most important in salmonids. Marine and freshwater fish can be infected. These protozoans can be found on most continents.

Bloodfeeding leeches are implicated in the transmission of the bloodborne species.

Cryptobia Cryptobia salmositica with red cell from an experimentally infected

The protozoans can be identified in skin and gill biopsies and blood samples. For some of the protozoans, antibodies can be detected in the fish using ELISA and fluorescent antibody testing.