Tel81 543 34 0411.Fax81 543 37 0239.Emailafukui@scc.u-tokai.ac.jp Fig. 1 Schematic illustration of a process showing a decrease in numbers of individuals for a cohort of Sergestid shrimp. The numerical values show the following periods: 1, autumnˆshing season at 0 age; 2, winter closed season at 0 age; 3, springˆshing season at 0 age; 4, summer closed season at 0 1 ages; 5, autumn shing season at 1 age; 6, winter closed season at 1 age, respectively. N shows the stock abundance in

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... bers on theˆrst day of the period. Nippon Suisan Gakkaishi 70(4), 592 597 (2004) 駿河湾におけるサクラエビの資源量推定 福 井 篤, 1 原 藤 晃, 1 伊 藤 大 輔, 1 保 正 竜 哉, 2 魚 谷 逸 朗 1 (2003 年 6 月 17 日受付,2004 年 3 月 2 日受理) 1 東海大学海洋学部水産学科 2 日本エヌユーエス株式会社環境事業本部