Upstream migration of chum salmon through a restored segment of the Shibetsu River

Akita, Moka; Makiguchi, Yuya; Nii, Hisaya; Nakao, Katsuya; Sandahl, Jason F.; Ueda, Hiroshi

doi:10.1111/j.1600-0633.2006.00153.x

Cited by 20 publications

(16 citation statements)

References 13 publications

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“…Although fish ladders have been installed since the 1970s in Hokkaido (Hokkaido Department of Fisheries 1992), recent efforts have focused on modifying existing dams to improve fish passage and allow greater movement of gravel and sediments that serve to maintain natural ecosystem function (Nakamura and Komiyama 2010). In addition, in order to recover both structure and function of these stream ecosystems, a channelized river has been restored to a more natural, meandering state using the isolated old channel (Akita et al 2006). Therefore, it is important to improve our understanding of physical and biological components of streams and rivers, and how they interact to create and maintain salmon habitat (Stanford et al 2005).…”

Section: Salmon Management and Future Perspectivementioning

confidence: 99%

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: Salmon Management and Future Perspectivementioning

confidence: 99%

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

et al. 2011

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“…It is becoming apparent that behavior is an extremely important factor affecting energy use ). In the reconstructed segment of the Shibetsu River, apparently the flow conditions are still not sufficiently complex to offer sufficient holding habitat for chum salmon in 2002 (Akita et al 2006). We suspect that pink salmon may need to swim deeper than chum salmon to optimize energy use in the reconstructed segment.…”

Section: Discussionmentioning

confidence: 99%

“…In the Shibetsu River, the reconstruction of channel alternation to a more natural state was preliminary conducted in March 2002, and additional phases of reconstruction are planning after evaluating the results of preliminary restoration. However, there is only one study on the effect of reconstruction on upstream migratory behavior of chum salmon in the Shibetsu River (Akita et al 2006). More information about upstream migratory behavior of chum salmon and other salmonid species are necessary for further restoration of the Shibetsu River river planned in the future.…”

Section: Introductionmentioning

confidence: 99%

“…Micro-data logger storaging information of ambient depths and temperature also has been used to monitor chum salmon behavior in the sea (Tanaka et al 1998(Tanaka et al , 2000(Tanaka et al , 2001. However, there has been only one study that used EMG transmitters and depth/temperature (DT) loggers simultaneously to investigate the upstream migration of chum salmon (Akita et al 2006). Data collected by both EMG transmitter and DT logger enable us to have coupled time-series information for swimming speed and swimming depth.…”

Section: Introductionmentioning

confidence: 99%

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Upstream migration of adult chum and pink salmon in the Shibetsu River

Makiguchi

Nii²,

Nakao³

et al. 2007

Developments in Fish Telemetry

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This paper has not been submitted elsewhere in identical or similar form, nor will it be during the first three months after its submission to Hydrobiologia AbstractThe migratory behavior and swimming patterns of anadromous upstream migratory fish have been poorly described in the Shibetsu River in eastern Hokkaido, Japan. In this 2004 study, we used electromyogram (EMG) transmitters and depth/ temperature (DT) loggers to compare the upstream migratory behavior of adult male chum salmon (Oncorhynchus keta) and pink salmon (O. gorbuscha) in the canalized and reconstructed segments of the Shibetsu River, where a part of canalized section was preliminary reconstructed meander to restore a more natural section. The EMG transmitter and DT logger were externally attached to the left side of the body, below the front edge of the dorsal fin. Fish of both species often migrated along the riverbanks and near the bottom of the water column, sometimes engaged in holding behavior, which was defined as cessation of swimming during their upstream migration for 5 minutes.Modal swimming depth calculated by DT loggers for chum salmon (0.2-0.4 m) was shallower than pink salmon (0.6-0.8 m). Further, modal swimming speeds measured by calibrated EMG for chum salmon (0.2-0.4 BL s -1 ) were slower than pink salmon (1.2-1.4 BL s -1 ). Pink salmon swam faster as well as in relatively deeper than chum salmon, suggesting that they expend more energy than chum salmon in the reconstructed segment. Based on these results, it seemed likely that the upstream migration behavior of chum and pink salmon was different with species-specific strategies.2

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“…Moreover, to make habitats more diverse, we installed LW structures into the experimental remeandering reach in summer 2004. Ecological and engineering studies have been conducted (Watanabe et al 2005;Akita et al 2006;Nakano and Nakamura 2006;Nakano et al 2007).…”

Section: The Shibetsu River Restoration Projectmentioning

confidence: 99%

Methods for and fish responses to channel remeandering and large wood structure placement in the Shibetsu River Restoration Project in northern Japan

et al. 2008

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The Shibetsu River Restoration Project intends to reestablish a historic meander pattern by connecting a 3.5-km channelized reach with a series of oxbow lakes that were previously isolated by channel straightening. Prior to full-scale construction, a remeandering experiment (pilot) was conducted upstream of the project segment to assess the methods for and ecological responses to channel remeandering. Large wood (LW) structures were also installed in the experimental remeandering reach. The channel remeandering project with LW placement in a large lowland river is the first undertaken in Asia, and it has rarely been undertaken elsewhere. In this report, we present an overview of the Shibetsu River Restoration Project and the methods for and fish responses to channel remeandering and LW placement in the experiment.

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Upstream migration of chum salmon through a restored segment of the Shibetsu River

Cited by 20 publications

References 13 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

Upstream migration of adult chum and pink salmon in the Shibetsu River

Methods for and fish responses to channel remeandering and large wood structure placement in the Shibetsu River Restoration Project in northern Japan

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