Age and Growth of Pacific Saurey &lt;i&gt;Cololabis saira&lt;/i&gt; (Brevoort) in the Western North Pacific Ocean Estimated from Daily Otolith Growth Increments

Suyama, Satoshi; Sakurai, Yasunori; Shimazaki, Kazunori

doi:10.2331/fishsci.62.1

Cited by 23 publications

(29 citation statements)

References 2 publications

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“…On the other hand, Watanabe and Kuji [12] showed that the microincrements in the otolith [13] are daily growth increments in rearing experiments. Based on their report, the age (in days) of Pacific saury can be assessed and growth analysis can be performed [10,11,[14][15][16][17][18]. However, the number of daily otolith rings in the hyaline zone cannot generally be counted [10,11], and so, because it was difficult to calculate the total number of daily rings in one-year fish with hyaline zones, we could not determine the hatch date.…”

Section: Introductionmentioning

confidence: 99%

“…Based on their report, the age (in days) of Pacific saury can be assessed and growth analysis can be performed [10,11,[14][15][16][17][18]. However, the number of daily otolith rings in the hyaline zone cannot generally be counted [10,11], and so, because it was difficult to calculate the total number of daily rings in one-year fish with hyaline zones, we could not determine the hatch date. Kurita et al [18] counted the number and measured the widths of otolith daily rings of age-zero fish that had not yet formed a hyaline zone, and found that daily growth increments were widest after hatching and subsequently narrowed.…”

Section: Introductionmentioning

confidence: 99%

“…A hyaline zone [6,7], formed in the otolith during the autumn and winter [6][7][8][9][10][11], allows differentiation of age-one and age-zero fish. On the other hand, Watanabe and Kuji [12] showed that the microincrements in the otolith [13] are daily growth increments in rearing experiments.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal change in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira

Suyama¹,

Oshima

Nakagami³

et al. 2009

Fish Sci

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We examined seasonal changes in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira collected from June to December 2002-2004, based on 12,164 specimens. Results of the analysis using a generalized linear model indicated that there were differences in the intercepts among months, but no difference was seen in the slopes. In addition, post hoc analysis showed that the intercepts got larger as the month progressed from June to December. These results suggested that although the body length growth rate decreased, the growth of the otolith does not decrease to the same degree as the body after September, so the ratio of otolith radius to body length becomes larger as the months pass. Consequently, we consider that the seasonal change in relation between otolith radius and body length affects the back-calculation of body length based on otolith radius.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal change in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira

Suyama¹,

Oshima

Nakagami³

et al. 2009

Fish Sci

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“…Larger saury (>280 mm) hatched from autumn to winter in the JARPN II survey period (Suyama et al, 1996) are mature, and adult size saury have a higher caloric value compared to other prey, suggesting the minke whales feed on the highly nutritious saury later in the season when mature saury are distributed in the subarctic region.…”

Section: What Determines the Diet Of Whales In Spatiotemporal Scale?mentioning

confidence: 99%

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Konishi¹,

Tamura²,

Isoda³

et al. 2009

J. Northw. Atl. Fish. Sci.

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Stomach contents analysis showed that the three whale species are highly dependent on small pelagic fish, i.e. Japanese anchovy, Pacific saury and mackerels in addition to copepods and euphausiids. Pianka's niche overlap index showed high diet overlap among whale species that occur in some areas where they feed on pelagic fish. Canonical correspondence analysis (CCA) indicated environmental and biological factors significantly contribute to the diet composition of whales. CCA also explained the distribution patterns of whales in relation to SST, chlorophyll a concentration and geographical variation. These analyses demonstrated that the diet composition of the baleen whales is determined by spatio-temporal environmental factors and the amount of small pelagic fish carried by the Kuroshio Current. The total seasonal prey consumption by whales in the study area was estimated to be 774 000 t of Japanese anchovy (16% of the consumed biomass), 44 000 t of Pacific saury (1% of the consumed biomass), and 140 000 t of mackerels (14% of the consumed biomass), indicating these baleen whales are important components in the ecosystem, and warrant inclusion in fisheries assessments.

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“…In the western Pacific, saury reach a length of 30 cm in 1 year (Watanabe et al, 1988). Their life span has been estimated to be 1.5-2.0 years (Suyama et al, 1996). The fishing grounds in the Oyashio region in autumn vary depending on the location of the Oyashio and warm core rings that originate in the Kuroshio and Tsugaru Warm Current.…”

Section: Mackerel Including Chub (S Japonicus) and Spotted Mackerelmentioning

confidence: 99%

An overview of the Oyashio ecosystem

Sakurai

2007

Deep Sea Research Part II: Topical Studies in Oceanography

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115

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The Oyashio shelf region and the seasonally ice-covered areas north of Hokkaido are highly productive, supporting a wide range of species including marine mammals, seabirds and commercially important species in the western subarctic Pacific. The fishes include gadids, such as walleye pollock and Pacific cod, and subarctic migratory pelagic fishes such as chum salmon and pink salmon. It is also an important summer feeding ground for subtropical migrants such as the Japanese sardine, Japanese anchovy, Pacific saury, mackerels, Japanese common squid, whales and seabirds. In recent decades, some components of the Oyashio ecosystem (i.e., phytoplankton, mesozooplankton, gadid fish, and subtropical migrants) have shown changes in species abundance or distribution that are correlated with environmental changes such as the 1976/77 and 1988/89 regime shifts. The First Oyashio Intrusion moved northward from the mid 1960s until the late 1970s when it moved southward until the 1980s, after which it returned to the north again after the mid 1990s. The sea surface temperature in spring decreased after the late 1970s, increased after the late 1980s, and remained high during the 1990s. The extent of ice cover in the Sea of Okhostk also decreased during the latest warming in the 1980-90s but has increased again since the late 1990s. These and other kinds of variability are described in this overview of the status of the Oyashio ecosystem and the surrounding region.

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Age and Growth of Pacific Saurey <i>Cololabis saira</i> (Brevoort) in the Western North Pacific Ocean Estimated from Daily Otolith Growth Increments

Cited by 23 publications

References 2 publications

Seasonal change in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira

Seasonal change in the relationship between otolith radius and body length in age-zero Pacific saury Cololabis saira

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An overview of the Oyashio ecosystem

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