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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第65巻 第2号 >


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Title: 北海道函館湾アサリ漁場の形成過程
Other Titles: Formation of Fishing Ground of the Short-necked Clam Ruditapes philippinarum in Hokuto, Hakodate Bay, Hokkaido
Authors: 伊藤, 詩織1 Browse this author
田村, 亮輔2 Browse this author
森本, 翔一3 Browse this author
五嶋, 聖治4 Browse this author →KAKEN DB
Authors(alt): Ito, Shiori1
Tamura, Ryosuke2
Morimoto, Shoichi3
Goshima, Seiji4
Keywords: Short-necked clam
Hakodate Bay
Fishing ground
Spawning season
Issue Date: 20-Aug-2015
Publisher: 北海道大学大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 65
Issue: 2
Start Page: 93
End Page: 100
Abstract: Histological observation on adult gonads of the short-necked clam Ruditapes philippinarum, field surveys about distribution of adults, and settling site of juveniles were investigated to examine formation process of fishing ground of the clam at Hokuto, Hakodate Bay, Hokkaido, Japan. Gametogenesis was observed from April to September, and gonadal maturation occurred between June and September, with peak period from July to August in this survey year. Number of juveniles was the highest in October, and they settled from shore area to offshore area of the sampling site. In December, number of individuals in shore area was more than that of offshore area. On the other hand, adults were distributed over shore area in all research months. From the above results, we can suggest that this fishing ground is formed through the following steps. Larvae settle and recruit in the whole fishing area, and metamorphose into juveniles. Juveniles in the offshore area are transported, move or dead by some factor, and number of juveniles increase relatively in the shore area. Finally, when clams remained in the shore area grow to a fishable size of 32mm in shell length, they become a target for the clam fishing.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第65巻 第2号

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