Encyclopedia of Parasitology

2016 Edition
| Editors: Heinz Mehlhorn

Ichthyobodo necator

Reference work entry
DOI: https://doi.org/10.1007/978-3-662-43978-4_1565


Costia necatrix


Phylum Euglenozoa, Classis Trypanosomatidae, Order Bodonida


The spherical, free-swimming (10–20 × 6–10 μm) swarmer has two flagella (9 and 18 μm long) and a long typical mitochondrial kinetoplast (Fig. 1). The reproduction occurs by binary fission. The free-swimming stages become attached to the surface of a fish and then appear pear-shaped (Fig. 2) and develop a chitinous layer as outer cover.
Ichthyobodo necator, Fig. 1

Diagrammatic representation (DR) of the swarmer of Ichthyobodo necator

Ichthyobodo necator, Fig. 2

DR of the skin-attached trophozoite of Ichthyobodo necator

Life Cycle

After feeding, the fixed trophozoites (Fig. 2) detach from the skin, sink to the ground, close the feeding opening, and thus become a cyst, within which 256 so-called dinospores (or swarmers) are formed, which must find a host within 24 h.


FlagellolTM (Sera) (nitroimidazoles).

Further Reading

  1. Mehlhorn B et al (1992) Health for ornamental fish. Springer, HeidelbergGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institut für Zoomorphologie, Zellbiologie und ParasitologieHeinrich-Heine-UniversitätDüsseldorfGermany