01津行篤士ほか.indd

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1 Biosphere Sci (2016) 耳石 Sr:Ca 比によって推定した利根川産大型ヤマメの回遊履歴 1) 2) 3) 1) * 1) ) ) 要旨 8 Sr:Ca km キーワード : Sr:Ca 緒言 Oncorhynchus masou masou ,000t t Kasugai et al km 16,840km km 2014 Sr:Ca Sr:Ca 材料および方法供試魚の採集 cm km St * umino@hiroshima-u.ac.jp

2 2 4 Table 1 #1 7 7 St St. 3 Fig. 1 #8 St Sr:Ca g Sea of Japan Fig. 1. Map showing sampling stations (St. 1-4). Table 1. Summary of specimens Oncorhynchus masou masou used for Sr:Ca analyses. Fish ID Sampling site Distance from the Tonegawa River mouth (km) Sampling date Total length (cm) Body weight (kg) Migration patterns inferred from Sr:Ca ratio # 1 St June Non-anadromous # 2 St August Anadromous # 3 St April Non-anadromous # 4 St May Non-anadromous # 5 St June Anadromous # 6 St July Non-anadromous # 7 St July Anadromous # 8 St June Non-anadromous 耳石 Sr:Ca 比分析 8 Epofix Stuers m Sr:Ca JXA m 15Kv 10nA X % SrTiO 3 CaSiO Sr:Ca

3 3 結果および考察 8 Sr:Ca Fig. 2 Sr:Ca 2 # Sr:Ca m Sr:Ca 4 # Fig. 2. Changes in the Sr:Ca ratio between the core and the edge of the sagittal otolith of Oncorhynchus masou masou at km upstream in the Tonegawa River.

4 4 Oncorhynchus masou ishikawae Sr:Ca Arai and Tsukamoto Ohji et al Kasugai et al., 2014 Sr:Ca 2 5 # Sr:Ca 3 # # # Stenopsyche sp. Baetiella sp. Cercion sp. Table 2 Phoxinus sp Stenopsyche marmorata Phoxinus lagowski steindachneri km 200km # Table 2. Stomach contents of five Oncorhynchus masou masou. Stomach contents (species) Weight (g) # 1 # 3 # 4 # 6 # 8 Trichoptera (Stenopsyche sp.) Ephemeroptera (Baetiella sp.) 0.03 Odonata (Cercion sp.) 0.18 Oligochaeta (species unknown) Fish (Phoxinus sp.) 謝辞 Sr:Ca

5 5 引用文献 Arai, T., Tsukamoto, K., Application of otolith Sr : Ca ratios to estimate the migratory history of masu salmon, Oncorhynchus masou. Ichthyological Research. 45: pp Kasugai, K., Hayano, H., Mano, S., Watanabe, T., Yoshikawa, T., Saito, M., Wakimoto R., Sugiwaka, K., Preliminary study of migration history estimated from otolith Sr:Ca ratios of masu salmon (Oncorhynchus masou) in Lake Kussharo. Ichthyological Research. 61: pp pp Ohji M., Arai T., Miyazaki N., Comparison of organotin accumulation in the masu salmon Oncorhynchus masou accompanying migratory histories. Estuarine, Coastal and Shelf Science. 72: : Cottus sp middle-egg type Sr:Ca Oncorhynchus masou masou

6 6 Insight into the migratory history using otolith Sr : Ca ratio of the anadromous masu salmon Oncorhynchus masou masou from the Tonegawa River Atsushi Tsuyuki 1), Kouken Sorimachi 2), Hajime Arai 3), Tetsuya Umino 1) 1) Graduate School of Biosphere Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima , Japan 2) Okanogou, Fujioka, Gunma , Japan 3) Gunma Prefectural Fisheries Experimental Station, 13 Shikishimacho, Maebashi, Gunma , Japan Summary The migratory histories of Oncorhynchus masou masou in the Tonegawa River were evaluated from the ontogenetic changes in otolith Sr:Ca ratios. We sampled 8 fish at km upstream from the river mouth. Three fish were categorized as anadromous whereas five individual were categorized as nonanadromous life mode with the constantly low Sr:Ca ratios. Intraspecific variation in the migration modes recorded for O. masou masou suggest a plasticity strategy for anadromous behaviors. Key words: Anadromous, Migratory history, Oncorhynchus masou masou, Sr/Ca ratios, Tonegawa River

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