九州におけるイワナの生息実態と過去のイワナ生息の聞き込み調査－九州に自然分布のイワナは本当にいないのか？－

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タイトル別名
  • Probable native and introduced populations of white-spotted charr, <i>Salvelinus leucomaenis</i>, from Kyushu District by intensive hearing survey and local samplings

説明

Probable native and introduced populations of white-spotted charr, Salvelinus leucomaenis, from Kyushu Island, Japan were examined by intensive hearing survey, historical references and self-reproducing habitat as well as many sampling locations of whole Kyushu although charr of Kyushu has long been considered as no native populations, which Dr. M. Oshima had reported in the first taxonomical and biological review of Japanese charr in Japan in 1961. Charr is now confirmed by several rivers from Stream A of Fukuoka Pref., several streams of the Ohno River and Stream B of River B in Oita Pref., the Kuma River (a system of branch, the Kawabe River) and the Midori River in Kumamoto Pref., the Gokase, Mimi, Hitotsuse, and Oyodo rivers in Miyazaki Pref. Probable and reliable native populations of charr by intensive hearing survey resulted in the Ohno River. The river might have native populations of white-spotted charr because such local people in the Ohno River had reliable testimony before 1945 (the Second World War) or before ca. 1970 (because of possible charr aquaculture after 1970 in Japan), respectively as well as an old and possibly available reference of charr name [named as Iwana as Chinese characters in 1729–1735 (the Edo Era, Japan)] and a reference of 1925’s book. Further detailed genetic studies from the Japanese Archipelago is needed for such probable population in order to prove whether or not the Kyushu charr population is native. Urgent studies should be performed for conservation of probable native Kyushu charr because such habitats are vulnerable and isolated small populations.

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