163 日 本 の 希 少 魚 類 の 現 状 と 課 題 59(2):163 167 2012 11 5 在 来 渓 流 魚 (イワナ 類,サクラマス 類 ): 利 用, 増 殖, 保 全 の 現 状 と 課 題 Present status and future conservation of fluvial charr (Salvelinus spp.) and salmon (Oncorhynchus spp.) populations in Japanese mountain streams Salvelinus 2 6 Oncorhynchus masou 3 Salvelinus malma malma S. m. miyabei S. leucomaenis leucomaenis Oncorhynchus masou masou 1a S. l. pluvius 1b S. l. japonicus S. l. imbrius O. m. ishikawae O. masou subsp. Kawanabe, 1989 図 1. Salvelinus leucomaenis pluvius a Oncorhynchus masou masou b a b 3 6 2 3 Fausch et al., 2009 渓 流 魚 の 水 産 的 価 値 1981 2006 2010 17.0 t 89.2 t 81.5% 79.8% 2 2011 2009 1999
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