Difference between revisions of "Carp Pox"
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==Introduction== | ==Introduction== | ||
| − | Carp pox is a fairly common, relatively benign '''proliferative skin disease''' of cyprinids (carps and minnows). It is caused by a '''herpes virus'''. | + | Carp pox is a fairly common, relatively benign '''proliferative skin disease''' of cyprinids (carps and minnows). It is caused by a [[:Category:Herpesviridae|'''herpes virus''']]. |
It occurs most commonly in '''ornamental cyprinids''' and the '''common Carp''' in the UK. | It occurs most commonly in '''ornamental cyprinids''' and the '''common Carp''' in the UK. | ||
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Juvenile fish can be adversely affected by Carp Pox and can suffer a '''high mortality''', developing signs such as anorexia, intermittent immobility, exophthalmia, darkened skin and haemorrhages on the operculum and abdomen. | Juvenile fish can be adversely affected by Carp Pox and can suffer a '''high mortality''', developing signs such as anorexia, intermittent immobility, exophthalmia, darkened skin and haemorrhages on the operculum and abdomen. | ||
| − | Lesions usually '''develop in low temperatures''' (winter/spring) and '''regress with high temperatures''' (summer) but the latent infection remains. | + | Lesions usually '''develop in low temperatures''' (winter/spring) and '''regress with high temperatures''' (summer) but the latent infection remains. This means that lesions can '''recur''' the following year. |
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| − | This means that lesions can '''recur''' the following year. | ||
==Diagnosis== | ==Diagnosis== | ||
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'''Skin histology''' will reveal epidermal epithelial cell hyperplasia, and intracytoplasmic and intranuclear inclusions. | '''Skin histology''' will reveal epidermal epithelial cell hyperplasia, and intracytoplasmic and intranuclear inclusions. | ||
| − | ''' | + | '''Electron microscopy''' examination may reveal herpes-like particles in the hyperplastic epithelial cells. |
| − | '''Virus isolation''' and identification can be attempted by | + | '''Virus isolation''' and identification can be attempted by inoculation of tissue cultures, serum neutralisation or in-situ hybridisation. |
==Treatment and Control== | ==Treatment and Control== | ||
The only effective method of control is '''preventing the introduction''' of affected fish. | The only effective method of control is '''preventing the introduction''' of affected fish. | ||
| − | No particular treatment exists, but recovery can be accelerated by '''raising the temperature''' of the water to above | + | No particular treatment exists, but recovery can be accelerated by '''raising the temperature''' of the water to above 15°C, '''liming''' the ponds, or transferring the fish to ponds supplied with large amounts of '''clear, oxygenated water'''. |
If the disease is uncomplicated, the lesions will eventually be replaced by unmarked epidermis. However, lesions can recur due to the pathogen's nature as a herpes virus, and the disease can '''reappear''' the following Spring. | If the disease is uncomplicated, the lesions will eventually be replaced by unmarked epidermis. However, lesions can recur due to the pathogen's nature as a herpes virus, and the disease can '''reappear''' the following Spring. | ||
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Noga, E. (2010) '''Fish Disease: Diagnosis and Treatment''' ''John Wiley and Sons'' | Noga, E. (2010) '''Fish Disease: Diagnosis and Treatment''' ''John Wiley and Sons'' | ||
| − | [[Category: | + | |
| − | [[Category: | + | {{review}} |
| + | [[Category:Herpesviridae]] | ||
| + | [[Category:Fish Diseases]] | ||
| + | [[Category:Expert Review - Exotics]] | ||
Revision as of 22:48, 28 October 2011
Also known as: Fish Pox — Carp Herpesvirus — Epithelioma papillosum — Carp Epithelioma
Caused by: Cyprinid Herpesvirus 1 — CyHV-1
Introduction
Carp pox is a fairly common, relatively benign proliferative skin disease of cyprinids (carps and minnows). It is caused by a herpes virus.
It occurs most commonly in ornamental cyprinids and the common Carp in the UK.
Mortalities are very rare but the impact is mainly economic as the cutaneous growths reduce marketability of the fish.
Carp pox is present in most European countries, China, Japan, the USA, Russia, Israel, Korea and Malaysia.
Clinical Signs
Carp pox leads to the formation of benign, hyperplastic, papillomatous growths in the epithelium of carp.
The tumours are milky-white to grey, often described as resembling molten candlewax, and are raised 1-3mm above the skin on the head, fins and other body surfaces. The growths can gradually increase in size and end up covering large areas of the body surface before they eventually regress and disappear.
Adult fish usually show no other signs.
Juvenile fish can be adversely affected by Carp Pox and can suffer a high mortality, developing signs such as anorexia, intermittent immobility, exophthalmia, darkened skin and haemorrhages on the operculum and abdomen.
Lesions usually develop in low temperatures (winter/spring) and regress with high temperatures (summer) but the latent infection remains. This means that lesions can recur the following year.
Diagnosis
Diagnosis is usually made from external clinical signs.
Skin histology will reveal epidermal epithelial cell hyperplasia, and intracytoplasmic and intranuclear inclusions.
Electron microscopy examination may reveal herpes-like particles in the hyperplastic epithelial cells.
Virus isolation and identification can be attempted by inoculation of tissue cultures, serum neutralisation or in-situ hybridisation.
Treatment and Control
The only effective method of control is preventing the introduction of affected fish.
No particular treatment exists, but recovery can be accelerated by raising the temperature of the water to above 15°C, liming the ponds, or transferring the fish to ponds supplied with large amounts of clear, oxygenated water.
If the disease is uncomplicated, the lesions will eventually be replaced by unmarked epidermis. However, lesions can recur due to the pathogen's nature as a herpes virus, and the disease can reappear the following Spring.
| Carp Pox Learning Resources | |
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 Test your knowledge using flashcard type questions |
Ornamental Fish Q&A 05 |
References
Hoole, D. (2001) Diseases of carp and other cyprinid fishes John Wiley and Sons
Plumb, J. (2010) Health Maintenance and Principal Microbial Diseases of Cultured Fishes John Wiley and Sons
Woo, P. (2006) Fish Diseases and Disorders: Protozoan and metazoan infections CABI
Noga, E. (2010) Fish Disease: Diagnosis and Treatment John Wiley and Sons
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This article has been peer reviewed but is awaiting expert review. If you would like to help with this, please see more information about expert reviewing. |