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Bald sea urchin disease is a bacterial disease known to affect several species of sea urchins on Mediterranean Sea, North Atlantic and California coastlines. Research suggests two pathogens are responsible for the disease, ''Listonella anguillarum'' and ''Aeromonas salmonicida''. Infection generally occurs at the site of an existing physical injury. The affected area turns green and spines and other appendages are lost. If the lesion remains shallow and covers less than 30% of the animal's surface area, the animal tends to survive and eventually regenerates any lost tissue. However if the damage is more extensive or so deep that the hard inner test is perforated, the disease is fatal. ==Affected species== *''Allocentrotus fragilis'' *''Arbacia lixula'' *''Cidaris cidaris'' *''Echinus esculentus'' *''Paracentrotus lividus'' *''Psammechinus miliaris'' *''Sphaerechinus granularis'' *''Strongylocentrotus droebachiensis'' *''Strongylocentrotus franciscanus'' *''Strongylocentrotus purpuratus'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bald sea urchin disease」の詳細全文を読む スポンサード リンク
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