2012
DOI: 10.1111/j.1095-8649.2012.03315.x
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Effects of stocking hatchery fish on the phenotype of indigenous populations in the amago salmonOncorhynchus masou ishikawaein Japan

Abstract: The expression of colour marks (parr marks, red and black spots) of the amago salmon Oncorhynchus masou ishikawae was compared with microsatellite information, to see the effects of stocking hatchery fish on the phenotype of indigenous populations, which face extinction through extensive stocking. A Bayesian-based assignment test suggested introgression of two exotic clusters into one indigenous cluster in the stocked area and its vicinity. The number of parr marks was significantly higher in one hatchery-orig… Show more

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Cited by 10 publications
(11 citation statements)
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“…Hatchery‐reared fish have been released into many rivers in Japan to enhance the fish stocks available to local fishermen and recreational anglers. However, the genetic integrity and diversity of masu salmon have often been ignored, sometimes resulting in accelerated hybridisation between wild and hatchery fish both within subspecies (Kawamura, Furukawa, Kubota, & Harada, ; Kawamura, Kubota, Furukawa, & Harada, ) and among subspecies (Kitanishi, Mukai, Yamamoto, Tago, & Oda, ; Yamazaki, Shimada, & Tago, ). In addition, habitat fragmentation by artificial damming is frequent in Japanese and Taiwan rivers, resulting in decreased population sizes and reduced genetic diversity of salmonid populations (Kitanishi, Yamamoto, Edo, & Higashi, ; Yamamoto, Kubota, Hasegawa, & Nakamura, ; Yamamoto et al, ).…”
Section: Discussionmentioning
confidence: 99%
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“…Hatchery‐reared fish have been released into many rivers in Japan to enhance the fish stocks available to local fishermen and recreational anglers. However, the genetic integrity and diversity of masu salmon have often been ignored, sometimes resulting in accelerated hybridisation between wild and hatchery fish both within subspecies (Kawamura, Furukawa, Kubota, & Harada, ; Kawamura, Kubota, Furukawa, & Harada, ) and among subspecies (Kitanishi, Mukai, Yamamoto, Tago, & Oda, ; Yamazaki, Shimada, & Tago, ). In addition, habitat fragmentation by artificial damming is frequent in Japanese and Taiwan rivers, resulting in decreased population sizes and reduced genetic diversity of salmonid populations (Kitanishi, Yamamoto, Edo, & Higashi, ; Yamamoto, Kubota, Hasegawa, & Nakamura, ; Yamamoto et al, ).…”
Section: Discussionmentioning
confidence: 99%
“…Hatchery-reared fish have been released into many rivers in Japan to enhance the fish stocks available to local fishermen and recreational anglers. However, the genetic integrity and diversity of masu salmon have often been ignored, sometimes resulting in accelerated hybridisation between wild and hatchery fish both within subspecies (Kawamura, Furukawa, Kubota, & Harada, 2012;Kawamura, Kubota, Furukawa, & Harada, 2007) and among subspecies (Kitanishi, Mukai, Yamamoto, Tago, & Oda, 2017;Yamazaki, Shimada, & Tago, 2005).…”
Section: Phylogeographic History and Genetic Relationships Among Thmentioning
confidence: 99%
“…Increasing commercial (FAO, 2016) and recreational (Johnston et al, 2007) fishing, along with pollution and alterations of river courses through the construction of large reservoirs for hydroelectric plants, have placed natural fishe-ries resources under strong pressure (Auer, 1996;Agostinho et al, 2010;Mcdougall et al, 2014). As a result, several countries have developed interests in promoting stocking programs to restore fish stock and to prevent the extinction of endangered species (Svåsand et al, 2000;Steffensen et al, 2010;Kawamura et al, 2012).…”
Section: Introductionmentioning
confidence: 99%
“…Hatchery-reared masu salmon have been released into many rivers in Japan to enhance the fish stocks available to local fishermen and recreational anglers. However, their genetic integrities and diversities have been ignored, resulting in accelerated hybridizations between wild and hatchery fish within the subspecies [5,6] and among subspecies [7,8]. In addition, habitat fragmentations by artificial damming occur frequently in Japanese rivers, causing reduced population sizes and genetic diversities of salmonid populations [5,9,10].…”
Section: Introductionmentioning
confidence: 99%