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Spatial variation in the parasitic isopod load of the Japanese halfbeak in western Japan

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Title: Spatial variation in the parasitic isopod load of the Japanese halfbeak in western Japan
Authors: Kawanishi, R. Browse this author
Sogabe, A. Browse this author
Nishimoto, R. Browse this author
Hata, H. Browse this author
Keywords: Cymothoidae
Gill parasite
Mothocya parvostis
Hyporhamphus sajori
Host body condition
Habitat heterogeneity
Issue Date: 22-Nov-2016
Publisher: Inter-Research
Journal Title: Diseases of aquatic organisms
Volume: 122
Issue: 1
Start Page: 13
End Page: 19
Publisher DOI: 10.3354/dao03064
PMID: 27901500
Abstract: Cymothoid isopods (family Cymothoidae) are commonly found parasitizing diverse fishes, including commercial species. However, the effects of these parasites on host body condition are still poorly known. Here we investigated the spatial variation of the effects of parasite infection on host body condition, using the parasitic load of the cymothoid Mothocya parvostis on the Japanese halfbeak Hyporhamphus sajori at 4 sampling sites in western Japan. M. parvostis prevalence at each site (41.6-74.4%) was higher than that known for other fish host-cymothoid systems (usually less than 30%). The number of isopods in infected hosts, the reproductive status of female isopods (i.e. ovigerous/non-ovigerous), and the body size of female and male isopods relative to the size of their hosts were not significantly different among sites. However, at the site where human activity was most intense, M. parvostis infection had a significantly negative effect on host body condition. These results suggest that the effect of cymothoid infection on host body condition might be benign under natural conditions but becomes detrimental in habitats that are unsuitable for the host, such as highly human-impacted areas.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 川西 亮太

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