Host mussel utilization of the Itasenpara bitterling (Acheilognathus longipinnis) in the Moo River in Himi,Japan |
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| Authors: | Jyun-ichi Kitamura Junjiro N. Negishi Masaki Nishio Shiro Sagawa Jyun-ichi Akino Shigeyuki Aoki |
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| Affiliation: | (1) Department of Zoology, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku Kyoto, 606-8502, Japan;(2) Aqua Restoration Research Center, Kawashima Kasada-machi, Kakamigahara Gifu, 501-6021, Japan;(3) The Board of Education in Himi City, 4-9 Honmachi, Himi Toyama, 935-0016, Japan;(4) Present address: Kannonzaki Nature Museum, 4-1120 Kamoi, Yokosuka Kanagawa, 239-0813, Japan |
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| Abstract: | ![]()
Bitterling are fishes that use freshwater mussels for oviposition. The pattern of mussel utilization of an endangered bitterling species, Acheilognathus longipinnis, which spawned in autumn, was investigated in a lowland river. Six Unio douglasiae nipponensis (1.5% of total 388 individuals) hosted A. longipinnis embryos consistently in their outer gills, and they inhabited areas along the river bank where mussel density was relatively high on a less compacted mud substrate. Unexpectedly low rates of host utilization and the rare occurrence of juvenile (shell length, <40 mm) hosts (<0.8% of total individuals) suggest the need for greater attention to the conservation of A. longipinnis. |
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| Keywords: | Endangered species Freshwater mussel Conservation Reproduction Cross-section of river |
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