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Use of parasites as biological tags for separating stocks of the starspotted dogfish Mustelus manazo in Japan and Taiwan

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The parasite fauna of Mustelus manazo from seven localitiesin Japan and Taiwan was assessed for the feasibility of using parasitesas biological tags for the identification of different host stocks.Examination of 1038 host specimens resulted in 13 parasite speciesrecorded: one nematode, two myxosporeans, two copepods and eightcestodes. Although relatively low overall prevalence of the firstfive species at different localities showed some significant differences,the samples collected in Tokyo Bay bore the lowest similarity (19.2%).These results support previous studies, which suggested the existenceof a unique host stock in Tokyo Bay. Accordingly, combinations ofprevalence data may provide useful information on stock identification.Cestodes probably have the greatest potential for use as biologicaltags. Detailed examination of 25 specimens of M. manazo fromAomori and Tokyo Bay disclosed eight species of intestinal cestodes.A canonical discriminant analysis based on these species separatedthe two localities clearly.
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Keywords: Mustelus manazo; biological tag; elasmobranch; parasite; shark; stock separation

Document Type: Research Article

Affiliations: 1: Faculty of Fisheries, NagasakiUniversity, Nagasaki, Nagasaki 852-8521, 2: Departmentof Aquatic Bioscience, Graduate School of Agricultural and LifeSciences, University of Tokyo, Bunkyo, Tokyo 113-8657 and 3: Collegeof Bioresource Sciences, Nihon University, Fujisawa, Kanagawa 252-8510, Japan

Publication date: 01 April 2003

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