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Title: Cryptocaryon  
Author: World Heritage Encyclopedia
Language: English
Subject: Ichthyophthirius multifiliis, Fish diseases and parasites, Ciliate, Ich, Ciliates
Collection: Ciliates, Fish Diseases, Veterinary Protozoology
Publisher: World Heritage Encyclopedia


Cryptocaryon irritans
Yellow tang with white spots characteristic of marine ich
Scientific classification
Domain: Eukarya
(unranked): SAR
Superphylum: Alveolata
Phylum: Ciliophora
Class: Prostomatea
Genus: Cryptocaryon
Species: C. irritans
Binomial name
Cryptocaryon irritans

Cryptocaryon irritans is a species of ciliate protozoa that parasitizes marine fish, causing marine white spot disease or marine ich (pronounced ik).[1][2] It is one of the most common causes of disease in marine aquaria.


  • Taxonomy 1
  • Clinical 2
  • See also 3
  • References 4
  • Further reading 5
  • External links 6


Cryptocaryon irritans was originally classified as Ichthyophthirius marinus, but it is not closely related to the other species. It belongs to the class Prostomatea, but beyond that its placement is still uncertain.


The symptoms and life-cycle are generally similar to those of Ichthyophthirius in freshwater fish, including white spots, on account of which Cryptocaryon is usually called marine ich. However, Cryptocaryon can spend a much longer time encysted. Fish that are infected with Cryptocaryon may have small white spots, nodules, or patches on their skin, fins, or gills. They may also have ragged fins, cloudy eyes, pale gills, increased mucus production, or changes in skin color, and they may appear thin. Behaviorally, fish may act different. They may scratch, swim abnormally, act lethargic, hang at the surface or on the bottom, or breathe more rapidly as if they are in distress.[3]

Useful treatments (but not reef safe) of Cryptocaryon irritans are copper solutions, formalin solutions and quinine based drugs (such as Chloroquine Phosphate and Quinine Diphosphate).

Infections can be extremely difficult to treat because of other creatures, such as corals and other invertebrates, which will not survive standard treatments. Ideally fish with Cryptocaryon are quarantined in a hospital tank, where they can be treated with a copper salt or using hyposalinity. The display tank needs to be kept clear of fish for 6–9 weeks, the longer the better. This gives time for the encysted tomonts to release infectious theronts, which die within 24–48 hours when they cannot find a host.

See also


  1. ^ Noga, Edward J. (2010). Fish Disease: Diagnosis and Treatment (2nd ed.). Wiley-Blackwell. pp. 135–137.  
  2. ^ "ich". The American Heritage Dictionary of the English Language (5th ed.). Boston:  
  3. ^ Yanong, Roy P. E. (2009). Infections (Marine White Spot Disease) in Fish"Cryptocaryon irritans". University of Florida. 

Further reading

  • Colorni, Angelo (December 1987). "Biology of Cryptocaryon irritans and strategies for its control". Aquaculture 67 (1/2): 236–237.  
  • Dickerson, Harry W. (Summer 1994). "Treatment of Cryptocaryon irritans in Aquaria". SeaScope 11. 
  • Diggles, B. K.; Lester, R. J. G. (June 1996). "Infections of Cryptocaryon irritans on wild fish from southeast Queensland, Australia". Diseases of Aquatic Organisms 25 (3): 159–167.  
  • Goto, Tsuyoshi; Hirazawa, Noritaka; Takaishi, Yoshihisa; Kashiwada, Yoshiki (16 September 2014). "Antiparasitic effects of Sophora flavescens root extracts on the ciliate, Cryptocaryon irritans". Aquaculture 435: 173–177.  
  • Li, Ruijun; Dan, Xueming; Li, Anxing (December 2013). "Siganus oramin recombinant L-amino acid oxidase is lethal to Cryptocaryon irritans". Fish & Shellfish Immunology 35 (6): 1867–1873.  
  • Lin, Qianqian; Yang, Mei; Huang, Zhen; Ni, Wei; Fu, Guoliang; Guo, Guowei; Wang, Zhengchao; Huang, Xiaohong (8 November 2013). "Cloning, expression and molecular characterization of a 14-3-3 gene from a parasitic ciliate, Cryptocaryon irritans". Veterinary Parasitology 197 (3-4): 427–435.  
  • Yin, Fei; Gong, Qiyang; Li, Yanwei (February 2014). "Effects of Cryptocaryon irritans infection on the survival, feeding, respiratory rate and ionic regulation of the marbled rockfish Sebastiscus marmoratus". Parasitology 141 (2): 279–286.  

External links

  • Cryptocaryon

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