碩士 / 國立臺灣大學 / 動物學研究研究所 / 93 / The most principal nematode infected by economic fish was Anisakis simplex. People might become an accidental host of A. simplex third-stage larvae by ingestion of parasitized raw or undercooked fish. Whether dead or alive, these larvae might cause Anisakidosis or Gastroallergic anisakiasis. And they also induced digestive diseases or hypersensitivity reactions. The aim of this study is to investigate the parasitical fauna of spotted mackerel, Scomber australasicus, and then select an available parasite as the biological tag in stock identification of spotted mackerel around Taiwanese waters.
Spotted mackerel was sampled from Nan Fang Ao fishing port between April 2004 to March 2005. The main parasite fauna of spotted mackerel consists of nematodes belonging to the Family Anisakidae containing A. simplex, Hysterothylacium aduncum, Raphidascaris trichiuri, and Porrocaecum decipiens. And there was significant difference in numbers among A. simplex and the others ( <0.01). All A. simplex in fish were in the third-stage larval stage, a boring tooth and a big ventriculus were its characterization. These larvae were active and free in the body cavity which was their major location inside fish. In addition, encapsulated larvae were observed on livers and mesenteries.
All fish samples examined were grouped according to the sampling month, the body length (fork length) and age. An intensity more than 100 A. simplex third-stage larvae appeared in spring samples, the fork length of fish great than 280 mm, and the age more than 2 years old. The intensity of larvae infection was also higher in samples collected in reproduction season than that from non-reproduction season.
Two stocks of spotted mackerel of Taiwan named the Eastern-Northern group and the Western-Southern group was previously reported. Analysing the Anisakis populations inside spotted mackerel with PCR-RFLP, A. pegreffii and a recombinant genotype of A. simplex s. s. and A. pegreffii were found in the Eastern-Northern group. Besides these two species, a third species of A. typica was appeared in the Western-Southern group. It seem that the Anisakis larvae were useful biological tags in stock identification of spotted mackerel from Taiwanese waters.
| Identifer | oai:union.ndltd.org:TW/093NTU05312019 |
| Date | January 2005 |
| Creators | Yi-Ying Chou, 周宜瑩 |
| Contributors | Hsiu-Hui Shih, 施秀惠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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