Age composition of masu salmon smolts in northern Japan

Hayano, Hirofumi; Miyakoshi, Yasuyuki; Nagata, Mitsuhiro; Sugiwaka, K.; Irvine, James R.

doi:10.1046/j.1095-8649.2003.00022.x

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…This is the first report that has estimated the number of masu salmon caught by recreational anglers in the coastal area. Masu salmon spend 1–3 years in freshwater before migrating to the ocean 21 . Fishing for juvenile masu salmon (called Yamame or Yamabe) in rivers is popular and fishing pressure is often high 12 .…”

Section: Discussionmentioning

confidence: 99%

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Estimates of numbers of masu salmon caught by recreational fishermen in the coastal area off Iburi, Hokkaido, Japan

et al. 2004

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Recreational fishing for masu salmon Oncorhynchus masou has recently become popular in coastal areas of south-western Hokkaido, including the Iburi district. We sampled recreational party boats in the Iburi district in the winters of 1998-1999 and 1999-2000. Daily numbers of anglers and catches of masu salmon were provided by the captains of the fishing boats. On average, anglers caught approximately four masu salmon per day each year, and peak catches occurred from late January to early February. Estimated numbers (standard errors in parentheses) of masu salmon caught by recreational anglers in the Iburi district were 66 844 (11 685) in 1998-1999 and 57 454 (6559) in 1999-2000, equivalent to 12-13% of the total annual commercial catches of masu salmon in Hokkaido. High recreational catches illustrate the importance of evaluating this fishery in the assessment and management of masu salmon in Hokkaido.

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Section: Discussionmentioning

confidence: 99%

“…Masu salmon spend 1-3 years in freshwater before migrating to the ocean. 21 Fishing for juvenile masu salmon (called Yamame or Yamabe) in rivers is popular and fishing pressure is often high. 12 As the present paper reports, fishing pressure is also high in the coastal areas.…”

Section: Discussionmentioning

confidence: 99%

Estimates of numbers of masu salmon caught by recreational fishermen in the coastal area off Iburi, Hokkaido, Japan

et al. 2004

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“…They have a longer freshwater phase than chum and pink salmon (age at smolting ranges from 1 to 3 years; Hayano et al, 2003) and are probably affected to a greater extent by freshwater habitat losses caused by damming and channelling than chum and pink salmon. The positive effects of hatchery programmes and the negative effects of habitat losses may counterbalance each other.…”

Section: Riverine Salmon Habitatmentioning

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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“…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].…”

Section: Introductionmentioning

confidence: 99%

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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Age composition of masu salmon smolts in northern Japan

Abstract: Smolts of anadromous masu salmon Oncorhynchus masou aged 3+ years were found in a northern Japanese river. This is the first recording of 3+ year smolts in Japan. These fish appeared to originate in the cold upper river where 2+ year parr were found during autumn.

Cited by 12 publications

References 6 publications

Estimates of numbers of masu salmon caught by recreational fishermen in the coastal area off Iburi, Hokkaido, Japan

Estimates of numbers of masu salmon caught by recreational fishermen in the coastal area off Iburi, Hokkaido, Japan

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

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

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