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Title: 陸奥湾におけるハタハタ稚魚の豊度と成長履歴
Other Titles: Abundance and growth trajectory of Japanese sandfish (Arctoscopus japonicus) juveniles in Mutsu Bay
Authors: 工藤, 充弘1 Browse this author
髙津, 哲也2 Browse this author →KAKEN DB
福井, 翔太郎3 Browse this author
甲本, 亮太4 Browse this author
Authors(alt): Kudo, Mitsuhiro1
Takatsu, Tetsuya2
Fukui, Shotaro3
Komoto, Ryota4
Keywords: ハタハタ
Issue Date: 25-Apr-2012
Publisher: 日本魚類学会
Journal Title: 魚類学雑誌
Volume: 59
Issue: 1
Start Page: 21
End Page: 35
Abstract: Although spawning of Japanese sandfish (Arctoscopus japonicus) does not occur in Mutsu Bay, juveniles of the species were first discovered in the bay in June 2003 (following the initiation of yearly sampling in 1991), also being collected in subsequent years. To better understand the function of Mutsu Bay as a nursery area and the growth characteristics of the early life stages of the sandfish population, their abundance and otolith microstructure were investigated. Juveniles distributed along the sea floor in temperatures of 7.4–10.0˚C were sampled in June 2010, measuring 32.4–62.7 mm in standard length some 100–145 days after hatching, an indication of their having hatched from January 14 to February 27 (24% and 76% of juveniles hatched in January and February, respectively). June sampling surveys, conducted each year, revealed that high juvenile abundance in the bay occurred only when adult sandfish had been abundant in the Sea of Japan, off Akita and Aomori Prefectures. The origin of the juveniles in Mutsu Bay may have been the eastern Sea of Japan population, distributed off the northwestern coast of Honshu Island, the Tsushima/Tsugaru Warm Current possibly conveying the larvae and juveniles into Mutsu Bay. Median hatching dates did not differ between sampling stations in Mutsu Bay, although relatively small juveniles with narrow otolith increment widths occurred in the inner part of the bay in June 2010. Such slow-growing juveniles may have been early arrivals to Mutsu Bay from the hatching area, thereby experiencing colder water in the bay from a young age than later arrivals.
Type: article
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: 高津 哲也

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