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噴火湾におけるソウハチCleisthenes pinetorum仔魚の摂餌強度と年級群強度

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Title: 噴火湾におけるソウハチCleisthenes pinetorum仔魚の摂餌強度と年級群強度
Other Titles: Larval feeding intensity and year class strength of pointhead flounder Cleisthenes pinetorum in Funka Bay
Authors: 平岡, 優子1 Browse this author
高津, 哲也2 Browse this author →KAKEN DB
大野, 雄介3 Browse this author
奥村, 裕弥4 Browse this author
高橋, 英昭5 Browse this author
高橋, 豊美6 Browse this author →KAKEN DB
Authors(alt): Hiraoka, Yuko1
Takatsu, Tetsuya2
Ohno, Yusuke3
Okumura, Hiroya4
Takahashi, Hideaki5
Takahashi, Toyomi6
Keywords: diet
feeding intensity
Funka Bay
water temperature
year class strength
Issue Date: 28-May-2009
Publisher: 水産海洋学会
Journal Title: 水産海洋研究
Journal Title(alt): Bulletin of the Japanese Society of Fisheries Oceanography
Volume: 73
Issue: 2
Start Page: 90
End Page: 101
Abstract: To understand how strong year classes of pointhead flounder Cleisthenes pinetorum have occurred in Funka Bay, Japan, larval density, initial feeding intensity, initial prey density, oceanic conditions, and the age distribution of mature and immature flounders were investigated for several years. The proportions of collected numbers of mature and immature flounders in the 2001 and 2005 year classes were higher than those in the 2002, 2003, 2004, and 2006 year classes. A previous paper reported abundant densities and awide variety of developmental stages (stagesA-F) of pointhead flounder larvae collected with a plankton net in August 2001 compared to low and a narrow range of stages (stagesA-B) collected in 2002-2003. This paper reports a similar phenomenon : abundant and numerous stages in September and October 2005 (stagesA-G) but not in 2004 and in 2006 (stagesA-D). Therefore, year class strength appears to relate mainly to mortality during the early larval stages. Horizontal hauls collected with a ring net in Funka Bay showed that pelagic larvae occurred with in a water temperature range of 3.8-19.1℃ at 30m depth. First feeding larvae (stageA) had a relatively low feeding intensity (≦0.5prey・larva-1) under low water temperature (≦12.0℃) conditions. The results of this study suggest that both relatively high mean water temperature between June and October and inflow of the Tsugaru Warm Current, which transports larvae to the nursery area in the bay and contributes feeding success, are necessary to produce a strong year class of pointhead flounder.
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: 高橋 豊美

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