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山口県東部瀬戸内海沿岸におけるアサリの減耗要因 野外ケージ実験による検討 Mortality causes of the bivalve, Ruditapes philippinarum, in the intertidal zone of the Seto Inland Sea, eastern Yamaguchi Prefecture -A field study by caging experiments Matsuda, Haruna 松田, 春菜 マツダ, ハルナ Matsuda 松田 マツダ Haruna 春菜 ハルナ Hamano, Tatsuo 浜野, 龍夫 ハマノ, タツオ Hamano 浜野 ハマノ Tatsuo 龍夫 タツオ Shimono, Tomoharu 霜野, 智治 シモノ, トモハル Shimono 霜野 シモノ Tomoharu 智治 トモハル Yamana, Yusuke 山名, 裕介 ヤマナ, ユウスケ Yamana 山名 ヤマナ Yusuke 裕介 ユウスケ open access cages; mortality causes; predator control; Ruditapes philippinarum; Scaphechinus mirabilis To evaluate the mortality of the bivalve Ruditapes philippinarum caused by predatory animals, two experiments were conducted in the coastal area of the western Seto Inland Sea around the Tana Marine Biological Laboratory, Yamaguchi Prefecture, Japan. On the tidal flat, four cages of different designs were set on the bottom, and 200 individuals of R. philippinarum (14.8 mm in average shell length [SL]) were put into each cage (Experiment 1). From the number of survivors after four months, the mortalities due to environmental factors, predators entering from the upper side and those from the bottom were estimated to be 0.615, 0.225 and 0.170, respectively. On the other hand, in the raft experiment, containers filled with sand and R. philippinarum juveniles (< 5 mm SL) were set into the cages hanging from the raft at depths of 1, 3, 5 and 7m (Experiment 2). Five individuals of the sand dollar Scaphechinus mirabilis were also introduced into the container at each depth. Four months later, large-sized individuals (20-30 mm SL) of R. philippinarum were observed in the containers, indicating that the juvenile bivalves survived and grew even in the presence of S. mirabilis. Therefore, this study shows that S. mirabilis is not the major cause of mortality of R. philippinarum. 水産大学校 National Fisheries University 2009-02-28 jpn departmental bulletin paper https://fra.repo.nii.ac.jp/records/2011901 fishu_k_57_165 https://agriknowledge.affrc.go.jp/RN/2010780558 agriknowledge AN00124678 0370-9361 水産大学校研究報告 Journal of National Fisheries University 57 3 9 165 173 https://fra.repo.nii.ac.jp/record/2011901/files/fishu_k_57_165.pdf application/pdf 694.4 KB 2024-10-11