Hole-in-the-Head Disease (Hexamita / HLLE)

About this condition

Commonly seen in cichlids and discus, this condition produces pitting or hole-like lesions around the sensory organs of the head and lateral line. Involvement of internal parasites (Hexamita spp.) combined with nutritional deficiencies and chronic water quality deterioration is thought to play a role.

Common symptoms

• Small pits or hole-like lesions appear around the head and lateral line
• White mucus-like discharge may be observed from lesion sites
• Loss of appetite and gradual wasting
• Lesions spread and general lethargy develops as the condition progresses

Common causes

• Involvement of internal parasites of the genus Hexamita (Spironucleus)
• Nutritional deficiencies including vitamin C and minerals
• Chronic water quality deterioration and elevated nitrate levels
• Stress and weakened immune function

Prevention (husbandry & daily care)

Preventing nitrate accumulation through proper filter management and regular water changes, and providing a nutritionally balanced and varied diet, are the fundamentals of prevention. Avoiding overcrowding helps reduce stress.

Related species guide

When to see a vet

What can a specialist store do?

A specialist store familiar with aquatic animals will comprehensively assess the severity and husbandry environment (water quality and diet), providing specific guidance on environmental improvement and nutritional management. While aquatic-animal veterinarians are limited in number, those who do treat fish may be able to investigate internal parasites and advise on a management plan.

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