Restoration of spawning and rearing habitats for masu salmon, &lt;i&gt;Oncorhynchus masou&lt;/i&gt; in a channelized stream

Nagata, Mitsuhiro; Omori, Hajime; Yanai, Seiji

doi:10.2331/fishsci.68.sup2_1707

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…Habitat conditions in most of the rivers in Hokkaido are degraded by various human activities, e.g., urban development, channelization, agriculture, and dams (Kaeriyama and Edpalina 2004;Fukushima 2005;Morita et al 2006). Recently, efforts have begun to rehabilitate riverine habitats for salmon (Nagata 2002;Nakamura and Komiyama 2010). Conditions of spawning habitats for chum salmon have not been sufficiently evaluated in Hokkaido.…”

Section: Discussionmentioning

confidence: 97%

The occurrence and run timing of naturally spawning chum salmon in northern Japan

et al. 2011

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Since the late 20th century, the biomass of Pacific salmon Oncorhynchus spp. has increased. Hokkaido, northern Japan, is one of the main areas of chum salmon O. keta production in the North Pacific and intensive hatchery programs support the recent high abundance. However, proper management of naturally spawning populations is necessary to conserve healthy stocks of this species. In 2008, we started a program to assess the naturally spawning chum salmon populations in Hokkaido. Of the total of approximately 1,500 rivers in Hokkaido, 238 rivers with lengths of longer than 8 km (excluding those rivers used for hatchery broodstock collection) were surveyed in 2008 and 2009. The number of nonenhanced rivers found to contain naturally reproducing chum salmon was 59 (31.4% of surveyed rivers) and 50 (37.6% of surveyed rivers) rivers in 2008 and 2009, respectively. Including the rivers where hatchery broodstock were collected and rivers shorter than 8 km that contain naturally spawning chum salmon, chum salmon ascended at least 191 and 175 rivers in Hokkaido in 2008 and 2009, respectively. Repeated foot surveys indicated that the run timings of naturally spawning chum salmon may be affected by coastal commercial fisheries. This study showed that naturally spawning chum salmon remain in many rivers in Hokkaido where hatchery programs have been intensively conducted.

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Section: Discussionmentioning

confidence: 97%

The occurrence and run timing of naturally spawning chum salmon in northern Japan

et al. 2011

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“…Fukushima and Kameyama (2006) showed that the estimated loss of masu salmon habitat resulting from damming is substantial. In contrast, river water quality has improved considerably in recent decades ( Figure 5; Kuroda, 1982), and efforts have been made to rehabilitate river habitat for fish, including spawning-bed enhancement, improvement of fish passage, and re-meandering of channelized rivers (Toyoshima et al, 1996;Nagata et al, 2002;Sagawa et al, 2004;Kawaguchi and Nakamura, 2005). Recreational fishing in rivers is prohibited for all anadromous Pacific salmon species, except fishing for juvenile masu salmon outside the smolting season.…”

Section: Riverine Salmon Habitatmentioning

confidence: 94%

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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“…For many species, clean rocky substrates in the form of reefs are particularly important spawning and nursery habitats and may strongly influence recruitment potential in deeper waters [8]. Gravel beds serve the same purpose for salmonids and other riverine species in shallow water environments [9,10]. Despite their importance, many reefs and other rocky spawning areas have been lost or degraded due to habitat destruction from anthropogenic stressors [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Similar habitat remediation in western North American rivers has focused on the creation of gravel spawning beds for salmonids such as coho salmon Oncorhynchus kisutch [43], Chinook salmon Oncorhynchus tshawytscha [44], and rainbow trout Oncorhynchus mykiss [45]. Globally, salmonid gravel remediation projects have been conducted in Norway [46], Japan [10], Sweden [47], and England [48].…”

Section: Introductionmentioning

confidence: 99%

Review of Methods to Repair and Maintain Lithophilic Fish Spawning Habitat

Baetz

Tucker

DeBruyne

et al. 2020

Water

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Rocky reefs provide important spawning and refuge habitats for lithophilic spawning fishes. However, many reefs have been lost or severely degraded through anthropogenic effects like dredging, channelization, or sedimentation. Constructed reefs have been used to mitigate these effects in some systems, but these reefs are also subject to degradation which may warrant custodial maintenance. Monitoring and maintenance of natural or constructed spawning reefs are not common practices; therefore, few methodologies have been created to test the effectiveness of such tools. We conducted a literature review to assess available information on maintenance of rocky spawning habitats used by lithophilic fishes. We identified 54 rocky spawning habitat maintenance projects, most of which aimed to improve fish spawning habitats through the addition of spawning substrate (n = 33) or cleaning of substrate (n = 23). In comparison to shallow riverine studies focused on salmonids, we found little information on deep-water reefs, marine reefs, or other fish species. We discuss the possible application of potential spawning habitat cleaning methods from other disciplines (e.g., treasure hunting; archeology) that may provide effective means of reef maintenance that can be used by restoration practitioners.

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Restoration of spawning and rearing habitats for masu salmon, <i>Oncorhynchus masou</i> in a channelized stream

Cited by 8 publications

References 3 publications

The occurrence and run timing of naturally spawning chum salmon in northern Japan

The occurrence and run timing of naturally spawning chum salmon in northern Japan

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

Review of Methods to Repair and Maintain Lithophilic Fish Spawning Habitat

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