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Life history traits and population dynamics of the invasive ascidian, Ascidiella aspersa, on cultured scallops in Funka Bay, Hokkaido, northern Japan

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Title: Life history traits and population dynamics of the invasive ascidian, Ascidiella aspersa, on cultured scallops in Funka Bay, Hokkaido, northern Japan
Authors: Kanamori, Makoto Browse this author
Baba, Katsuhisa Browse this author
Natsuike, Masafumi Browse this author
Goshima, Seiji Browse this author →KAKEN DB
Keywords: invasive ascidian
Ascidiella aspersa
life history traits
population dynamics
aquaculture
scallop
Issue Date: Mar-2017
Publisher: Cambridge University Press
Journal Title: Journal of the Marine Biological Association of the United Kingdom
Volume: 97
Issue: 2
Start Page: 387
End Page: 399
Publisher DOI: 10.1017/S0025315416000497
Abstract: The European sea squirt, Ascidiella aspersa was first found as an alien species in 2008 from Funka Bay, Hokkaido, northern Japan, causing serious damage to the scallop aquaculture industry. We investigated A. aspersa on cultured scallops and larval occurrence from July 2010 to June 2014 to clarify life history traits and population dynamics, and consider the relation between the life history of A. aspersa and the process of scallop aquaculture. Larvae of A. aspersa were found from June to December, and recruitment on cultured scallops occurred mainly between July and October. The ascidians grew well and their weights increased until February. We found that 60-80% of A. aspersa that had settled in summer had eggs or sperm in autumn, and 90-100% of A. aspersa matured early the following summer. Maturity size in September was 17-20 mm as male, 22-24 mm as female. Scallops in Funka Bay are hung in the spring and harvested from winter to the next spring. Ascidiella aspersa settle as larvae in early summer, and grow well until winter, resulting in overgrowth on scallops in the harvest season. The linking of the process of scallop aquaculture and the life history of A. aspersa explains why this invasive ascidian has caused serious damage to the aquaculture industry in the bay. In comparison to the earlier descriptions of the native population, A. aspersa in Funka Bay has longer reproductive and growth periods, earlier initiation of reproduction, and possibly smaller maturity size.
Rights: This article has been published in a revised form in Journal of the Marine Biological Association of the United Kingdom, http://dx.doi.org/10.1017/S0025315416000497. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © copyright holder.
Type: article (author version)
URI: http://hdl.handle.net/2115/67082
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 五嶋 聖治

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