Table 1
Description of the nineteen sampling stations and three reference hatcheries, number of individuals analyzed (N) and the date of sampling. E = flowing to eastern Japan: Pacific Ocean; W = to the west: Sea of Japan. All the sampling stations are in Honshu Island unless indicated as “Hokk.” = Hokkaido Island.
| Map | Station | N | date | Medium | Drainage | Year of first introduction or observation | Reference |
|---|---|---|---|---|---|---|---|
| 1 | Mamachi stream (trib. of Chitose river) | 25 | 2012 | River | Ishikari (W, Hokk) | 1984 in the main river | Urawa (1989) |
| 2 | Monbetsu stream (trib. of Chitose river) | 25 | 2012 | River | Ishikari (W, Hokk)) | ||
| 3 | Jigoku stream (flows to Lake Chuzenji) | 22 | 2017 | Lake | Tone (E) | Early 1900’s | Maruyama et al. (1987) |
| 4 | Chuzenji hatchery | 25 | 2016 | Hatchery | Honsu Japan | Early 1900’s | Fukuda (1999) 1 |
| 5 | Kane stream | 25 | 2016 | River | Fuji (E) | 2012 | Tanizawa et al. (2016) |
| 6 | Odori stream | 24 | 2016 | River | Jinzu (W) | 2004 | Ishizaki et al. (2012) |
| Upper Azusa (in Kamikouchi valley) | |||||||
| 7 | station 1 | 24 | 2013 | River | Shinano (W) | Early 1930’s2 | Sakata (1974) |
| 8 | station 2 | 18 | 2013 | River | Shinano (W) | ||
| 9 | station 3 | 19 | 2013 | River | Shinano (W) | ||
| 10 | Zenrokusawa stream (trib. of Azusa) | 1 | 2013 | River | Shinano (W) | ||
| 11 | Shimizusawa stream (trib. of Azusa) | 3 | 2013 | River | Shinano (W) | ||
| Lower Azusa (close to Matsumoto city) | |||||||
| 12 | Azusa (adults) | 7 | 2008 | River | Shinano (W) | Early 1990’s | Yagyu et al. (2016) |
| 13 | Azusa (YOY) | 13 | 2008 | River | Shinano (W) | ||
| 14 | Azusa (Sai) (close to Toyoshina) | 9 | 2016 | River | Shinano (W) | ||
| 15 | Azusa (close to Shimauchi) | 21 | 2016 | River | Shinano (W) | ||
| 16 | Hekirichi stream | 25 | 2013 | River | Hekirichi (E; Hokk.) | 1990 | Morita et al. (2004) |
| 17 | Shiriuchi stream | 25 | 2013 | River | Shiriuchi (E; Hokk.) | ||
| 18 | Shizunai stream | 25 | 2013 | River | Shizunai (E; Hokk.) | ||
| 19 | Torizaki stream | 25 | 2013 | River | Torizaki (E) | ||
| 20 | Lées Athas hatchery | 20 | 2014 | Hatchery | French Dept. 64 | Bohling et al. (2016) | |
| 21 | Cauterets hatchery (2014 strain raised in Babeau hatchery) | 28 | 2014 | Hatchery | French Dept. 65 & 34 | Bohling et al. (2016) | |
| 22 | Isère hatchery | 30 | 2008 | Hatchery | French Dept. 38 | Bohling et al. (2016) | |
1: Fukuda (1999): fishermen started cultivation of brown trout in the Chuzenji area in 1924.
2: In addition, eyed eggs were supposed to be imported from Mepp Co. (a defunct French company) in 1973 (Maruyama et al., 1987).
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