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

Miyakoshi, Yasuyuki; Urabe, Hirokazu; Saneyoshi, Hayato; Aoyama, Tomoya; Sakamoto, Hiroyuki; Ando, Daisei; Kasugai, Kiyoshi; Misawa, Yoshio; Takada, Masayuki; Nagata, Mitsuhiro

doi:10.1007/s10641-011-9872-5

Cited by 44 publications

(25 citation statements)

References 7 publications

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“…While the number of artificially hatched and stocked chum salmons has increased, that of wild salmon from natural reproduction has significantly decreased due to the degradation of river ecosystems [40]. Despite the small population size, wild chum salmon are reproducing naturally in about 60 rivers across Hokkaido [41]. As previously noted, these wild salmon have higher trophic levels and genetic-endemism than hatchery fish, as well as an extensive adaptability to environmental change.…”

Section: Future Challengesmentioning

confidence: 97%

Effect of global warming on the life history and population dynamics of Japanese chum salmon

2014

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We have reviewed the effects of long-term climatic/oceanic conditions on the growth, survival, production dynamics, and distribution of Hokkaido chum salmon Oncorhynchus keta in Japan during the period 1945-2005 using path analysis, back-calculation, and scale analyses, and applied a prediction method based on the SRES-A1B scenario of the intergovernmental panel on climate change. The populations of Hokkaido chum salmon were found to have had high growth rates at age 1 year since the late 1980s. Path analysis indicated that the growth at age 1 year in the Okhotsk Sea was directly affected by warm sea surface temperature associated with global warming, with the increased growth at age 1 year resulting in higher rates of survival and large population sizes. Predictions on the global warming effects on the chum salmon were (1) decreased carrying capacity and distribution area, (2) occurrence of a strong density-dependent effect, and (3) loss of migration route to the Sea of Okhotsk, especially for Hokkaido chum salmon. We have also outlined the future challenges of establishing a sustainable conservation management scheme for salmon that include adaptive management and precautionary principles, as well as conservation of natural spawning populations and recovery of natural river ecosystems in Japan despite the warming climate.

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Section: Future Challengesmentioning

confidence: 97%

Effect of global warming on the life history and population dynamics of Japanese chum salmon

2014

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“…This objective can be achieved with a hatchery protocol that ensures a large number of broodstock and maximises individual male-female crosses. A good example of this is the chum salmon enhanced fishery in Japan, which releases 1 billion hatcheryreared salmon annually, bred from 1.3 million spawners [78]. In management plans for threatened and endangered species, a minimum effective breeding population size of 500 has been recommended [79,80].…”

Section: Bridging the Inequality (2): The Haliotis Laevigata Abalone mentioning

confidence: 99%

Commercial scale invertebrate fisheries enhancement in Australia: Experiences, challenges and opportunities

Hart

2015

Marine Policy

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“…Chum salmon fry have not been stocked in the Izari River to increase commercial catches, but naturally spawning populations have been observed [22]. The peak spawning time of chum salmon in this river is midSeptember [22].…”

Section: Adult Field Collectionmentioning

confidence: 99%

“…Recently, the existence of naturally spawning populations has been confirmed in several rivers in Hokkaido, where chum salmon fry have never been stocked [22]. However, the seasonal variations in V N in these naturally spawning populations have not been examined.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in and effect of incubation water temperature on vertebral number in naturally spawning chum salmon Oncorhynchus keta

et al. 2011

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Seasonal variations and reaction norms for vertebral number (V N ) in response to incubation water temperature were estimated in adult and juvenile naturally spawning chum salmon Oncorhynchus keta. The mean V N of adults varied according to spawning time; the earlyspawning population had higher V N values than the latespawning population. Moreover, the mean V N values in the early-spawning population decreased with seasonal changes, whereas V N values in the late-spawning population remained stable. Chum salmon embryos in three full-sib families were incubated at five different temperatures until hatching, and the V N values of the resulting juveniles were analyzed. The V N reaction norm to incubation water temperature showed a V-shaped curve that was lowest at an intermediate temperature. The mean V N at the same incubation temperature varied among the three families. These results suggest that V N values in chum salmon are influenced by genetic components and incubation water temperatures. V N may be a useful parameter for estimating the environmental conditions during ontogenesis and the genetic background by detecting population changes.

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

Cited by 44 publications

References 7 publications

Effect of global warming on the life history and population dynamics of Japanese chum salmon

Effect of global warming on the life history and population dynamics of Japanese chum salmon

Commercial scale invertebrate fisheries enhancement in Australia: Experiences, challenges and opportunities

Seasonal variations in and effect of incubation water temperature on vertebral number in naturally spawning chum salmon Oncorhynchus keta

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