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head and lateral line erosion
Head and lateral line erosion, (HLLE) or hole-in-the-head (HITH) is a disease in fish. Chronic ulcerative dermatopathy or chronic erosive dermatopathy are symptoms of similar conditions with different etiology.
==Symptoms==
HLLE begins as small pits of receding epithelium (skin) around the fish’s head and/or lateral line, and sometimes onto the unpaired fins. Rarely fatal, it does cause disfigurement, making the fish less suitable for public aquarium display. At least 20 families of fish have been identified as having developed HLLE in captivity. Not all species of fish show the same symptoms, and do not always develop lesions to the same degree. 〔(Hemdal 2006).〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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