거머리, Limnotrachelobdella sinensis의 기생으로 인한 붕어, Carassius auratus 아가미의 조직병리학적 관찰
Histopathological observation of the gill of the crucian carp Carassius auratus by the leech Limnotrachelobdella sinensis
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10 개체의 붕어, Carassius auratus 아가미뚜껑의한쪽면에 1-4개체의 거머리, Limnotrachelobdella sinensis들이 기생하고 있었다. 거머리들의 평균 길이는 약 41.0 mm 정도였고, 폭은 11 mm였다. 이들의몸체는 anterior sucker, neck, trunk, posterior sucker로구성되어 있었고 각각의 평균 길이는 2.3 mm, 7.2mm, 23.3 mm, 8.7 mm였다. 몸통의 양 옆에는 11쌍의lateral vesicle이 존재하였다. Anterior sucker를 SEM으로 관찰한 결과 이들은 반구모양으로 중앙에는proboscis가 나오는 입이 존재하고 있었다. Proboscis 는 식도와 바로 연결되어 있었다. 거머리에 의해서흡혈되어진 붕어의 아가미를 광학현미경으로 관찰하였을 때 새판융합, 새엽 및 새판 상피세포 과증식,점액세포 증가 및 울혈이 관찰되었다. 하지만 몇몇개체들에서 나타나는 새엽 상피세포의 괴사 및 수종변성과 식세포의 침투 등은 거머리의 흡혈 활동 이후세균 혹은 바이러스에 의한 2차 감염이 원인인 것으로 생각되어진다.
Abstract
On the inner side of each operculum of the crucian carp, Carassius auratus (n=10), the leeches, Limnotrachelobdella sinensis of 1-4 individuals were parasitic. The leeches had approximately 41.0 mm in total length and 11 mm in width. These body was composed with anterior sucker, neck, trunk and posterior sucker and average length was 2.3 mm, 7.2 mm, 23.3 mm and 8.7 mm respectively. To both sides of the trunk lateral vesicle of 11 pair existed. When observed by SEM, anterior sucker was hemisphere shape and the mouth where proboscis comes out existed with the its center. Proboscis was connected the esophagus directly. Under light microscopy, bloodsucking gill of C. auratus showed lamella fusion, hypertrophy the epithelial cell of the filament and lamella, increased mucocytes and congested capillaries. On the other hand, necrotic and hydropic degeneration epithelial cell of the lamella, and infiltration of the macrophages from some individuals were suggested the secondary infection with the bacteria or virus after bloodsucking activity of the leech.
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