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

Miyakoshi, Yasuyuki; Nagata, Mitsuhiro; Sugiwaka, K.; Kitada, Shuichi

doi:10.1002/9780470751329.ch16

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…Recent studies have demonstrated size-dependent recovery rates of hatchery-reared masu salmon smolts [20,23,24]; however, in this study, smolt size did not have a significant effect on the recovery rate of wild masu salmon smolts within the length range. Holtby et al [12] and Saloniemi et al [27] noted that size dependence of marine survival of salmon smolts was not always observed, but was observed when the marine environment was characterized as unfavorable.…”

Section: Discussioncontrasting

confidence: 94%

“…Masu salmon Oncorhynchus masou, which is distributed only on the Asian side of the North Pacific, is a valuable species for both commercial and recreational fisheries in northern Japan, but commercial catches have been decreasing [20]. Masu salmon spend 1-3 years in fresh water prior to ocean entry as smolts [21], then spend 1 year in the marine environment, and return to the natal rivers to spawn [22].…”

Section: Introductionmentioning

confidence: 99%

“…Masu salmon spend 1-3 years in fresh water prior to ocean entry as smolts [21], then spend 1 year in the marine environment, and return to the natal rivers to spawn [22]. To increase commercial catches of masu salmon, hatchery programs have been conducted [20]. Recent studies have reported that an increase in smolt size had positive effects on the subsequent recovery rates of hatchery-reared masu salmon [20,23,24].…”

Section: Introductionmentioning

confidence: 99%

“…To increase commercial catches of masu salmon, hatchery programs have been conducted [20]. Recent studies have reported that an increase in smolt size had positive effects on the subsequent recovery rates of hatchery-reared masu salmon [20,23,24]. Knowledge on the marine survival of wild masu salmon and the causal factors would be useful for improving hatchery technology, but no such data have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Effects of smolt size and timing of migration on recovery rate of wild masu salmon Oncorhynchus masou

Miyakoshi

Saitoh

2011

Fish Sci

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Little is known about the survival rate of wild masu salmon Oncorhynchus masou. To examine the effects of smolt length and migration timing on the recovery rate of wild masu salmon, we reanalyzed past tagging and recovery data (1993)(1994). The tagging study was conducted in the Shokanbetsu River, northern Japan; 863 wild masu salmon smolts were captured, tagged, and released in a downstream site, and a total of 19 fish were recovered in coastal fisheries and in the natal river the following year. The data were analyzed by a logistic regression analysis with recapture as a response variable and tagging date and smolt length as explanatory variables; the tagging date had a significant effect on the recapture rate, whereas the effect of smolt size was not significant. Despite the small number of recaptures, this study indicates that migration timing is a factor affecting the marine survival of wild masu salmon smolts, although this conclusion has been repeatedly documented for other species of Pacific salmon Oncorhynchus spp.

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Section: Discussioncontrasting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of smolt size and timing of migration on recovery rate of wild masu salmon Oncorhynchus masou

Miyakoshi

Saitoh

2011

Fish Sci

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“…All masu salmon released before 1980 were fry, but smolts (1-year-olds) were also released after 1980 (Mayama, 1990). During 1993e2000, fry and smolts have accounted for 60e70% and 10e20%, respectively, of the total number of masu salmon juveniles released (Miyakoshi et al, 2004b).…”

Section: Hatchery Programmesmentioning

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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Hierarchical genetic structure of native masu salmon populations in Hokkaido, Japan

et al. 2018

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

Cited by 11 publications

References 12 publications

Effects of smolt size and timing of migration on recovery rate of wild masu salmon Oncorhynchus masou

Effects of smolt size and timing of migration on recovery rate of wild masu salmon Oncorhynchus masou

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

Hierarchical genetic structure of native masu salmon populations in Hokkaido, Japan

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