Estimates of Numbers of Juvenile Masu Salmon Oncorhynchus masou Caught by Recreational Anglers in an Urban Stream.

Ando, Daisei; Miyakoshi, Yasuyuki; Takeuchi, Katsumi; Nagata, Mitsuhiro; Satô, Takahiro; Yanai, Seiji; Kitada, Shuichi

doi:10.2331/suisan.68.52

Cited by 18 publications

(13 citation statements)

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“…As a condition to the inscription of the Shiretoko peninsula as a UNESCO Natural World Heritage Site in 2005, many dams on mountain streams have been removed or modified to improve passage to upstream spawning grounds in this region (Nakamura and Komiyama 2010). There are a number of other cases where habitats for adults and juveniles have been restored (Nagata et al 2002;Kawaguchi et al 2005). In a recent case, cooperation between a private paper company in Japan (Oji Paper, Inc.), a local conservation organization (Itou no Kai), and a non-profit conservation organization based in the USA (Wild Salmon Center) has resulted in the establishment of a new protected area, the Sarufutsu Environmental Conservation Forest in the Soya region of Hokkaido.…”

Section: Hokkaido Salmon Statusmentioning

confidence: 97%

“…As documented above for chum and pink salmon, very few quantitative surveys have been conducted to enumerate natural escapement for masu salmon in Hokkaido streams. Riverine environments of Hokkaido have become degraded due to anthropogenic disturbances such as damming (Fukushim 2005), channelization (Nagata et al 2002;Nagayama et al 2008), and agricultural land use (Nagasaka et al 2005). Impacts from these activities have been especially pronounced on masu salmon as a result of their relatively long freshwater life history stage.…”

Section: Hokkaido Salmon Statusmentioning

confidence: 99%

“…However, brood stock catches of masu salmon in the streams have shown no clear trend, but have exhibited high year-to-year variability. One explanation to explain why masu salmon abundance has not expanded is the rise in recreational catch of juveniles (Ando et al 2002). Recreational fishing for juvenile masu is very popular in Hokkaido because of the traditional food culture as well as a rising interest in masu fishing as a rewarding recreational activity.…”

Section: Hokkaido Salmon Statusmentioning

confidence: 99%

“…On the other hand, masu salmon, which have a longer freshwater life prior to smolting, have decreased in Hokkaido. It is thought that this decrease is due to a combination of fishing pressure (Ando et al 2002), low contribution of hatchery programs (Miyakoshi et al 2001a, b), negative impacts of captive broods (Edpalina et al 2004), and loss of freshwater environments for natural spawning and rearing (Nagata et al 2002;Fukushim 2005). Therefore, it is important not only to maintain the hatchery programs but also to conserve natural spawning to encourage the development of sustainable salmon fisheries resources in Hokkaido.…”

Section: Introductionmentioning

confidence: 97%

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An overview of salmon enhancement and the need to manage and monitor natural spawning in Hokkaido, Japan

et al. 2011

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The chum and pink salmon catches in Hokkaido, Japan have increased dramatically since the 1970s and the 1990s, respectively. In contrast, masu salmon catches have been steadily decreasing. Despite intensive hatchery development in Hokkaido, naturally spawning salmon populations persist based on results from a recent river survey. This paper focuses on the challenges of maintaining hatchery salmon populations while protecting natural chum, pink and masu salmon populations in Hokkaido. Two important initiatives related to meeting this ambitious goal are managing hatcheries in a way that minimizes negative interactions between natural and hatchery salmon populations, and initiating new efforts at restoring and rehabilitating degraded freshwater habitats. In addition, in order to maintain a balance of demand and supply in the domestic market through the exportation of extra salmon, Hokkaido has decided to enter full assessment to gain Marine Stewardship Council (MSC) certification of the Hokkaido chum salmon trap net fishery. This would involve a fundamental shift in fisheries management as practiced in Japan, specifically elevating the importance of managing the fishery in a way that conserves natural salmon populations. A key component of a new salmon management strategy is the establishment of a zone management framework based on the designation of stream units to spatially separate natural salmon from hatchery salmon to minimize negative effects of hatchery fish and to utilize effectively hatchery salmon for commercial fisheries. This effort is allied with similar initiatives in other Pacific Rim countries that are focusing on management reform to restore natural ecosystem function and maintain the coexistence of wild and hatchery salmon.

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Section: Hokkaido Salmon Statusmentioning

confidence: 97%

Section: Hokkaido Salmon Statusmentioning

confidence: 99%

Section: Hokkaido Salmon Statusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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An overview of salmon enhancement and the need to manage and monitor natural spawning in Hokkaido, Japan

et al. 2011

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“…In addition to commercial catches, major recreational angling for masu salmon occurs both in rivers and the sea. Ando et al (2002) estimated that 65% of juveniles in an urban stream were caught by recreational anglers, and Miyakoshi et al (2004a) estimated that saltwater recreational anglers were responsible for at least 12e13% of the coastal catches of masu salmon. Chum and pink salmon are also caught by saltwater recreational anglers, but no quantitative data are available.…”

Section: Commercial Fisheriesmentioning

confidence: 99%

A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan

Morita

Saito

Miyakoshi³

et al. 2006

ICES Journal of Marine Science

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A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan. e ICES Journal of Marine Science, 63: 1353e1363.Hatchery programmes involving the mass release of cultured fish have been implemented worldwide to supplement wild populations and to increase harvests. Hokkaido Island is one of the most active regions for Pacific salmon hatchery programmes, with ca. 1.2 billion (10 9 ) juveniles released annually along a coastline of ca. 3000 km. During the last quarter of the 20th century, coastal catches of chum and pink salmon increased dramatically, whereas those of masu salmon did not. In addition to the development of hatchery technologies, several possible hypotheses may explain these catch trends, including climate change, closing of high-seas fisheries, rehabilitation of water quality, habitat loss caused by damming and channelling, and increased pressure from recreational fisheries. Even when these other factors have been accounted for, it is difficult to evaluate whether all hatchery programmes have actually increased net populations. To use these programmes more effectively, it is necessary to evaluate both their river-and species-specific benefits and compare hatchery programmes with other management tools, such as fishery controls and habitat rehabilitation. Future hatchery programmes should incorporate active, adaptive learning approaches to minimize the risks associated with artificial propagation and to promote sustainable salmon stocks.

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Evaluation of Stock Enhancement Programs for Masu Salmon in Hokkaido, Northern Japan, by Two‐Stage Sampling Surveys of Commercial Landings

Miyakoshi¹,

Nagata²,

Sugiwaka³

et al. 2004

Stock Enhancement and Sea Ranching

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Estimates of Numbers of Juvenile Masu Salmon Oncorhynchus masou Caught by Recreational Anglers in an Urban Stream.

Cited by 18 publications

References 0 publications

An overview of salmon enhancement and the need to manage and monitor natural spawning in Hokkaido, Japan

An overview of salmon enhancement and the need to manage and monitor natural spawning in Hokkaido, Japan

A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan

Evaluation of Stock Enhancement Programs for Masu Salmon in Hokkaido, Northern Japan, by Two‐Stage Sampling Surveys of Commercial Landings

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