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Article: Coincidence in reproduction of the sea urchin Strongylocentrotus intermedius in Hirota Bay, on the Pacific Ocean off northern Honshu, and in the Sea of Japan off Hokkaido, Japan.(Abstract)
- Article from:
- Journal of Shellfish Research
- Article date:
- December 1, 2008
- Author:
CopyrightCOPYRIGHT 2008 National Shellfisheries Association, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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ABSTRACT Spawning season of Strongylocentrotus intermedius in Hokkaido is classified into the 3 types, Sea of Japan, Funka Bay, Sea of Okhotsk, and Pacific Ocean. To clarify the type in Pacific Ocean, northern Honshu, we calculated seasonal gonad indices (gonad wet weight/body weight x 100) monthly and plotted the gonad development process from histological observation of Strongylocentrotus intermedius collected at depths of 0.5-1.0 m in Hirota Bay, Iwate Prefecture, from September 2005 to November 2006. The gonad indices showed a seasonal cycle: they reached peaks of 20.7-23.5 from September to October, when the gonads were in the maturation stage. They fell sharply to ...
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