Effects of Lowering Seawater Temperature during Summer on Accelerating Maturation of Sea Urchin <i>Strongylocentrotus intermedius</i> (A. Agassiz)
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- Ishii Masataka
- Tomari Village Office
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- Masadate Akio
- Hokkaido Fisherman Training Institute
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- Hoshikawa Hiroshi
- Central Fisheries Research Institute, Hokkaido Research Organization
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- Masuda Atsunori
- Business Development Group, Solutioneering Dept., Corporate Secretariat, Yanmar Co., Ltd.
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- Murakami Katsusuke
- Department of Environmental Science and Technology, Graduate School of Bioresources, Mie University
Bibliographic Information
- Other Title
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- 夏季の水温上昇抑制がエゾバフンウニの成熟促進に及ぼす影響
- カキ ノ スイオン ジョウショウ ヨクセイ ガ エゾバフンウニ ノ セイジュク ソクシン ニ オヨボス エイキョウ
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Abstract
This paper examined the possibility of applying the water temperature control on seedling production of urchins. The experiment was conducted from May to November 2001 in order to evaluate the effects of lowering seawater temperature in summer, on the maturity promotion of sea urchins (Strongylocentrotus intermedius). Sea urchins were collected by scuba diving on the west coast of Hokkaido, Japan. They were then grouped into control group and experimental group. Sea urchins in experimental group were reared in cooled sea water below 18°C, while other urchins in control group were placed in ambient sea water. The comparative analysis was conducted to evaluate the effect of water temperature control between two groups. The change of gonad index (GI) prior to spawning was almost the same among urchins in both groups. However, urchins in experimental group showed early spawning by a month as is shown for decrease in GI and appearance of urchin in the spent stage (V) in September, comparing to urchins in control group. Although the result of our experiment did not show positive effects of lowering seawater temperature on the maturity promotion, it implied that lowering water temperature in summer contributed to inhibit a delay of spawning, and stabilized seedling production process of sea urchins.
Journal
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- Eco-Engineering
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Eco-Engineering 26 (2), 27-33, 2014
The Society of Eco-Engineering
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Keywords
Details 詳細情報について
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- CRID
- 1390001205188542080
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- NII Article ID
- 130004934927
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- NII Book ID
- AA12005685
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- ISSN
- 18804500
- 13470485
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- NDL BIB ID
- 025524362
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed