Adapting Hokkaido Hatchery Strategies to Regional Ocean Conditions Can Improve Chum Salmon Survival and Reduce Variability

Nagata, Mitsuhiro; Miyakoshi, Yasuyuki; Fujiwara, M.; Kasugai, Kiyoshi; Ando, Daisei; Torao, Mitsuru; Saneyoshi, Hayato; Irvine, James R.

doi:10.23849/npafcb6/73.85

Cited by 13 publications

(8 citation statements)

References 10 publications

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“…Many previous studies on chum salmon around Hokkaido reported that higher (lower) coastal SSTs in spring, corresponding to an early marine residence, contributed to better (worse) survival of juvenile chum salmon via growth, feeding, or swimming ability (e.g., Miyakoshi et al, 2007;Saito and Nagasawa, 2009;Kasugai et al, 2012;Nagata et al, 2016). Saito and Fukuwaka (2018) divided the Pacific coasts from northern Honshu to Hokkaido into four areas and showed that for each area, coastal SSTs during March-May in 1990-2014 had positive correlations with lagged catches of adult returns at age ≤ 4.…”

Section: Chum Salmon From the Pacific Waters Near Hokkaidomentioning

confidence: 99%

Unconventional Sea Surface Temperature Regime Around Japan in the 2000s–2010s: Potential Influences on Major Fisheries Resources

et al. 2020

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Climate-change associated changes in oceanographic conditions, particularly sea surface temperatures (SSTs), have systematically affected many marine fisheries resources around Japan. The Pacific Decadal Oscillation (PDO) index is considered one of the most important climate indices for describing basin-scale SST variations in the North Pacific, which are closely related to decadal variations in fisheries resources. Time series of the PDO index has been used to conventionally classify decadal conditions of ocean and fisheries resources around Japan as either warming or cooling regimes. It is now clear that for the 2000s to the mid-2010s, mostly during the "global surface warming slowdown," the SST regime around Japan was unconventional; despite the PDO index being in a negative phase, which normally corresponds to a warming regime around Japan, SSTs exhibited decadal cooling in some waters and seasons. SSTs in the western part of the North Pacific subtropical gyre gradually decreased, particularly in autumn-spring, whereas SSTs in the western subarctic gyre and the Sea of Okhotsk increased. Moreover, SSTs between the subtropical and subarctic waters around northern Japan exhibited seasonal contrasts that were decadally intensified through the combined effects of cooling in winter-spring and warming in summer-autumn. Some major marine fisheries resources around Japan showed decadal increases or decreases beginning in the mid-2000s, and appeared to respond to the unconventional SST changes in their early life stages. In this paper, we review atmosphere and ocean conditions around Japan in the 2000s-2010s in terms of global climate, present an overview of potential impacts of decadal SST trends on five major commercial fisheries resources (walleye pollock, chum salmon, Japanese sardine, Japanese anchovy, and Japanese flying squid), and raise awareness that an unconventional regime can appear transiently during a state of global warming.

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Section: Chum Salmon From the Pacific Waters Near Hokkaidomentioning

confidence: 99%

Unconventional Sea Surface Temperature Regime Around Japan in the 2000s–2010s: Potential Influences on Major Fisheries Resources

et al. 2020

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“…contributed to higher survivals. Chum salmon releases from Iturup Island occur June 17-28 (Zelenikhina et al 2015), when the water temperature in the surface layer in Prostor Gulf and Kuril'sky Bay usually exceeds 5°C, which is close to the optimal (7-11°C) for chum salmon releases in Hokkaido (Nagata et al 2016). Lower returns of chum salmon are found when chum are released at lower temperatures (Seki & Shimizu, 1996).…”

Section: Chum Salmon (Oncorhynchus Keta)mentioning

confidence: 99%

“…4). If further warming occurs, large releases may result in decreased survival and smaller returns as found for Hokkaido Island, where the conditions of the early feeding period in coastal waters led to the premature migration of chum salmon to open waters and a decrease of catches (Nagata et al 2016;Hirabayashi & Saito 2018;Gohda & Saito 2019). If there will be no further warming, then an increase in the release of juvenile chum salmon on Iturup Island may be followed by an increase in its stocks and catches.…”

Section: Chum Salmon (Oncorhynchus Keta)mentioning

confidence: 99%

The relative importance of enhancement to the production of Salmon on Iturup Island (Kuril Islands, Russia)

Klovach

Leman

Гордеев

2020

Reviews in Aquaculture

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A historical review of biological enhancement and fisheries for Iturup Island demonstrates that enhancement has significantly increased numbers of chum salmon while pink salmon are produced almost entirely naturally. Fourteen hatcheries currently produce and release chum salmon fry; four of these also generate pink salmon. Favourable natural conditions make the waters near Iturup Island one of the most productive marine areas in the Russian Far East. Efficient hatcheries combined with favourable conditions resulted in increases in chum salmon catches from less than 100 tonnes in the early 1990s to more than 20 000 tonnes in the late 2010s. Becoming better informed of factors controlling salmon production in the Kuril Islands should help scientists in other regions of the North Pacific understand what controls their own salmon populations.

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“…The early marine phase is considered the critical period for the survival of chum salmon, that determines the subsequent number of fish returned. One of the likely causes for the regional difference in return rates is the recent changes in the coastal environment around the time that juvenile salmon migrate into the area (Nagata et al 2016a). The recent high abundance of chum salmon in the Okhotsk coast should be due to the favorable ocean conditions and successful enhancement program.…”

Section: Fisheries and Oceans Canada 100 Annacis Parkway Unit 3 Deltmentioning

Adapting Hokkaido Hatchery Strategies to Regional Ocean Conditions Can Improve Chum Salmon Survival and Reduce Variability

Cited by 13 publications

References 10 publications

Unconventional Sea Surface Temperature Regime Around Japan in the 2000s–2010s: Potential Influences on Major Fisheries Resources

Unconventional Sea Surface Temperature Regime Around Japan in the 2000s–2010s: Potential Influences on Major Fisheries Resources

The relative importance of enhancement to the production of Salmon on Iturup Island (Kuril Islands, Russia)

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