Difference between revisions of "Head and Lateral Line Erosion"

From WikiVet English
Jump to navigation Jump to search
(Created page with "Also known as: '''''HLLE — Hole-in-the-head Syndrome''''' ==Introduction== This is a common '''chronic''' disease that affects marine aquarium fish, especially '''tangs and an...")
 
Line 5: Line 5:
  
 
The exact aetiology of the syndrome is '''unknown''', but proposed agents include '''parasites, carbon dust, heavy metals, electrical voltage, UV radiation, nutrient deficiencies in vitamin A or C'''. There may not be one particular inciting cause, and the syndrome may simply be a clinical response to various '''stressors'''. These may include overcrowding, poor water quality and poor nutrition.
 
The exact aetiology of the syndrome is '''unknown''', but proposed agents include '''parasites, carbon dust, heavy metals, electrical voltage, UV radiation, nutrient deficiencies in vitamin A or C'''. There may not be one particular inciting cause, and the syndrome may simply be a clinical response to various '''stressors'''. These may include overcrowding, poor water quality and poor nutrition.
 +
 
In one study, a '''reovirus''' was isolated from a moribund angelfish with HLLE lesions.  
 
In one study, a '''reovirus''' was isolated from a moribund angelfish with HLLE lesions.  
  
Line 32: Line 33:
 
A '''grounding device''' can be used to remove stray voltage from the system and changing the activated carbon in the filters may also be helpful.
 
A '''grounding device''' can be used to remove stray voltage from the system and changing the activated carbon in the filters may also be helpful.
  
If this is unsuccessful, an infectious cause should be suspected and should be treated with the appropriate antibacterial or antifungal.
+
If this is unsuccessful, an infectious cause should be suspected and should be treated with the appropriate antibacterial or antifungal agent.
  
 
'''0.01% becaplermin''' has been successfully used to treat HLLE in marine tropical fish by applying the product to the debrided skin lesions.
 
'''0.01% becaplermin''' has been successfully used to treat HLLE in marine tropical fish by applying the product to the debrided skin lesions.
Line 47: Line 48:
 
Noga, E. (2010) '''Fish Disease: diagnosis and treatment''' ''Wiley-Blackwell''
 
Noga, E. (2010) '''Fish Disease: diagnosis and treatment''' ''Wiley-Blackwell''
  
[[Category:To Do - Helen]]
+
 
[[Category:To Do - Review]]
+
{{review}}
 +
[[Category:Fish Diseases]]
 +
[[Category:Expert Review - Exotics]]

Revision as of 16:44, 30 October 2011

Also known as: HLLE — Hole-in-the-head Syndrome

Introduction

This is a common chronic disease that affects marine aquarium fish, especially tangs and angelfish.

The exact aetiology of the syndrome is unknown, but proposed agents include parasites, carbon dust, heavy metals, electrical voltage, UV radiation, nutrient deficiencies in vitamin A or C. There may not be one particular inciting cause, and the syndrome may simply be a clinical response to various stressors. These may include overcrowding, poor water quality and poor nutrition.

In one study, a reovirus was isolated from a moribund angelfish with HLLE lesions.

Secondary bacterial, fungal and parasitic infections may occur.

Clinical Signs

As the name suggests, the disease involves lesions of the head that sometimes extend down the lateral line.

They are usually progressive, often symmetrical, depigmented erosions and ulcerations that coalesce to produce large crateriform lesions and pits on the head, flanks and lateral line.

Fish may feed and behave normally, even when severely affected. Some fish may become anorexic, lethargic and thin.

Diagnosis

Diagnosis is based on the history and clinical signs.

The husbandry and environment should be evaluated for potential stressors.

Wet mount examination of the skin should be performed to identify any secondary infections.

Faecal examination may be beneficial to check for intestinal parasitism.

Histopathology may reveal: an erosive to ulcerative dermatitis with epidermal spongiosis, vesicle formation or inflammatory cell exocytosis.

Treatment

Treatment of HLLE is empirical and relies on the elimination of any potential stressors. Water quality should be improved if necessary, overcrowding reduced, and a balanced and varied diet should be fed.

A grounding device can be used to remove stray voltage from the system and changing the activated carbon in the filters may also be helpful.

If this is unsuccessful, an infectious cause should be suspected and should be treated with the appropriate antibacterial or antifungal agent.

0.01% becaplermin has been successfully used to treat HLLE in marine tropical fish by applying the product to the debrided skin lesions.

Fish can recover from HLLE but often have permanent scarring. The disease is rarely fatal.


Head and Lateral Line Erosion Learning Resources
FlashcardsFlashcards logo.png
Flashcards
Test your knowledge using flashcard type questions
Ornamental Fish Q&A 26


References

Roberts, H. (2009) Fundamentals of Ornamental Fish Health John Wiley and Sons

Noga, E. (2010) Fish Disease: diagnosis and treatment Wiley-Blackwell