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Morphological Comparison Hysterothylacium sp. and Anisakis simplex (Nematoda: Anisakidae) from Wild Black Rockfish, Sebastes schlegeli, and Histopathological Host Reaction  

Park, Jung-Jun (Pathology Division, National Fisheries Research and Development Institute)
Park, Myoung-Ae (Pathology Division, National Fisheries Research and Development Institute)
Choi, Hye-Sung (Pathology Division, National Fisheries Research and Development Institute)
Kim, Seok-Ryel (Pathology Division, National Fisheries Research and Development Institute)
Publication Information
Applied Microscopy / v.41, no.3, 2011 , pp. 205-213 More about this Journal
Abstract
Numerous anisakids were parasitic near the digestive tract of the black rockfish, Sebastes schlegeli and some anisakids observed on the liver of the host. Anisakids in the host were identified three species (Hysterothylacium sp., Anisakis simplex, A. pegreffii) and Hysterothylacium sp. was the high occurrence of anisakid worms in the host. Hysterothylacium sp. was shorter and thinner than A. simplex. Both of anisakids observed lip, mouth, nerve ring, excretory pore and excretory duct in the anterior portion. In the mid portion, anisakids had esophagus, ventriculus and intestine and especially, Hysterothylacium sp. had intestinal ceacum and ventricular appendage. There was conical nodulose apex at the end of the posterior portion in Hysterothylacium sp. and spine in A. simplex. SEM examination revealed that there was three lip near the mouth of Hysterothylacium sp. Dorsal lip was approximately 65 ${\mu}m$ and paried lateroventral lip were approximately 60 ${\mu}m$ in the width. All lips were found double papilla (approximately 8 ${\mu}m$ in the width). The body width of the Hysterothylacium sp. and A. simplex was approximately 480 ${\mu}m$ and 900 ${\mu}m$ respectively. The hight of the lateral alae was about 7 ${\mu}m$ and width of papilla on the cornical nodulose apex was about 3.3 ${\mu}m$ in Hysterothylacium sp. The hight of spine was approximately 20 ${\mu}m$ in A. simplex. There was mainly Hysterothylacium sp. in the intestinal lumen of the host. The nematod worms were parasitic near the mucosal fold and in the submucosal. In the mucosal epidermal layer, it was increased mucous cells by the infection of the parasites.
Keywords
Hysterothylacium sp.; Anisakis simplex; SEM;
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