著者

池田 勉

出版者

日本海洋学会

雑誌

日本海洋学会誌 (ISSN:00298131)

巻号頁・発行日

vol.34, no.4, pp.173-180, 1978-08-30 (Released:2011-06-17)

参考文献数

27

被引用文献数

2

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This paper reviews the author's research on metabolic activities of marine zooplankton for which the Okada Prize of the Oceanographical Society of Japan was awarded in 1978. The term metabolic activities used here refers to various physiological rate processes of zooplankton, such as respiration, excretion, feeding and growth.On the basis of experimental data obtained by the author and other workers, it is emphasized that all these rates are power functions of the body weight of zooplankton. In other words, the weight specific rates (rates per unit body weight) increase with a decrease in body weight. The habitat temperature of zooplankton can also affect the level of these rates.The relationship between these rates and body weight established experimentally can be applied to the estimation of the total rates of a zooplankton community in the field, by knowing the size distribution of individual zooplankters. The feasibility of this method was tested with the zooplankton community in the Kuroshio region.Finally, the potential importance of microzooplankton in total zooplankton respiration was suggested, based on respiration rate data recently obtained in the author's laboratory.

著者

池田勉著

出版者

朝日新聞出版

巻号頁・発行日

2018

著者

池田 勉

出版者

日本海洋学会

雑誌

日本海洋学会誌 (ISSN:00298131)

巻号頁・発行日

vol.46, no.6, pp.261-272, 1990

被引用文献数

21

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ニホンウミノミを1°, 5°, 8°, 12℃で飼育し, 脱皮間隔 (<I>IP</I>) と脱皮毎の体長増加 (△<I>BL</I>) を測定した. その結果, <I>IP</I>はニホンウミノミの体長が大きくなるほど, 水温が低いほど長くなった. △<I>BL</I>は体長によって変化したが水温による影響は見られなかった. 飼育実験で得られた同一個体についての連続した脱皮殻の観察から, 脱皮によって腹肢内・外葉の節数が脱皮によって1節ずつ増加することが分かり, 従って野外標本にもとつく△<I>BL</I>の推定が可能となった. このようにして, 飼育実験によるIPと, 野外標本による△BLから水温を変数とするニホンウミノミの成長モデルを提出した. この成長モデルから, 雌の育児嚢より放出された仔虫 (体長31.31mm) が仔虫を放出する雌 (体長: 10-17mm) に成長するのに要する日数は1℃で333-593日, 5℃で195-347日, 10℃で118-210日, 15℃で82446日となる. またこの成長モデルから計算される体重ベースの成長速度は同水温において同体重を有するオキアミのそれに匹敵する. 日本海におけるニホンウミノミの摂餌状態について若干の論議をした.

著者

永松 哲郎 重廣 律男 堀田 好洋 池田 勉

出版者

鹿児島大学

雑誌

鹿兒島大學水産學部紀要 (ISSN:0453087X)

巻号頁・発行日

vol.52, pp.1-12, 2004-02-27

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The third generation「Nansei-Maru」is a fishery training vessel of the Faculty of Fisheries, Kagoshima University. This ship was built in November, 2002 to carry out the training for navigation and operation of fishing vessel, training of fishery, observation of ocean environment and investigation of marine creatures. The present paper describes about development of the hull form based on the tank tests. The resistance measurement tests, self-propulsion tests and wake measurements at propeller plane were conducted by use of a ship model of 3.5m long in a towing tank. These tests show the designed hull form is entirely satisfactory for her propulsive performance. Next, rolling measurements were made for three kinds of bilge keels both in calm sea and in waves in order to grasp their rolling characteristics. A ship model of 2.0m long was used in the measurements. From the results, the biggest one shows to be the most effective for anti-rolling and then it was selected as the bilge keels of「Nansei-Maru」. Flow visualization tests around ship bow and stern were also carried out by using the 2.0m ship model in a circulating water channel. It is found that there is no problem for entrainment of air bubbles into the sonar dome and severe turbulence at stern. Finally, sea trial tests by the full scale ship were conducted and it is confirmed that ship speed, turning performance and so on are satisfied for their requirements.

著者

品田 章良 伴 修平 池田 勉 津田 敦 齊藤 宏明

出版者

日本プランクトン学会

雑誌

日本プランクトン学会報 (ISSN:03878961)

巻号頁・発行日

vol.47, no.2, pp.119-124, 2000-08-25

参考文献数

26

被引用文献数

3

著者

池田 勉

出版者

至文堂

雑誌

国文学 (ISSN:03869911)

巻号頁・発行日

vol.32, no.2, pp.35-39, 1967-02