• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.68-71
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• 1998

The egg structure and shape of the skin parasite, Entobdella hippoglossi from the Atlantic halibut, Hippoglossus hippoglossus was examined using scanning electronic microscope. The newly produced eggs of E. hippoglossi were yellowish in color and tetrahedral in shape. The eggs were entwined together in a complicated chain-like fashion by a long filament. The appendage showed the presence of buoy-like structures. The buoy-like structures on the appendage of the eggs of E. hippoglossi in the present study were totally different from other sticky droplets. It is suggested that these structures are not sticky droplets but buoys for floating eggs which have entwined together on the bottom of the sea. It seems that these buoy-like structures may be needed for preventing the eggs from being covered by mud or particles and thus maintaining the eggs in an oxygenated environment.

• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.63-67
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• 1998

The host finding behavior of Entobdella hippoglossi oncomiracidium, skin parasite of the Atlantic halibut was investigated. Almost of the parasite swam downward from the top to the bottom of the 150cm glass tube within 30 minutes. The average swimming speed of oncomiracidium was $0.32\pm0.10cm/second$ throughout the experiment. When the parasites arrived on the bottom of the glass tube, they moved upwards and downwards continuously within the 10cm of the bottom. This behavior would suggest that it may be one of the essential methods for host searching of the parasite. When the oncomiracidia was exposed different stimuli, they responded positively light and halibut mucus.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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• pp.433-433
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• 2000

The monogenean skin parasite, Entobdella hippoglossi has commonly be found broodstock of the Atantic halibut. Heavy infestation of the parasite appears to be serious problem to the halibut farming industry. However, because the behavior of host, research on this parasite is not yet be carried out. The present study, therefore, was investigated the oncomiracidium of Entobdella hippoglossi to the basic step for solving this problem. (omitted)

• 한국어류학회지
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• 제11권2호
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• pp.134-138
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• 1999

피부흡충인 Entobdella hippoglossi가 숙주인 Atlantic halibut의 피부에 기생할 때 기생 부위별 밀도와 숙주의 피부 점액세포 밀도를 조사하여 E. hippoglossi의 기생이 피부점액 세포의 밀도와 관계가 있는가를 조사하였다. 숙주인 Atlantic halibut 복측과 배측에 기생하는 E. hippoglossi의 밀도는 비슷하였으나 기생충의 크기는 복측이 배측보다 더 컸으며, 배측내에서는 배측의 머리부분에 기생하는 E. hippoglossi의 밀도가 배측의 중앙부나 꼬리부분에서보다 높았다. 숙주의 점액세포 크기, 밀도 그리고 표피 점액층의 두께는 대체로 기생충의 밀도와 비례하였고, 숙주내에서 기생충의 선택적 기생은 점액세포의 밀도와 관계가 있었다.