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).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.