Comparison of stomach contents between Japanese sardine &lt;i&gt;Sardinops melanostictus&lt;/i&gt; and anchovy &lt;i&gt;Engraulis japonicus&lt;/i&gt; using commercial fisheries together with the two species in the Japan Sea during spring

Baba, Takashi; Morimoto, Haruyuki; Goto, Tanjuro; Nanjo, Nobuaki; Oda, Masanori; Ueno, Yoichiro

doi:10.2331/suisan.17-00018

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…The result suggesting active feeding of the sardine on copepods corroborates those of previous studies in the Sea of Japan (Baba et al, 2018), where copepods are usually the dominant mesozooplankton (Hirakawa et al, 1992, 1995, 1999). The present study revealed that copepods distributed and fed on to the sardine in the offshore area were larger (heavier) than those in the coastal area.…”

Section: Discussionsupporting

confidence: 91%

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Yasuda

Kitajima

Hayashi

et al. 2021

Fisheries Oceanography

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Japanese sardine (Sardinops melanostictus) in the Sea of Japan expanded their distribution from the coast to offshore with an increase in population biomass; however, little is known about the suitability of the offshore habitat for this species. Using lipid analysis, this study compared the body condition of juvenile sardine between an area off the Noto Peninsula (offshore) and the Tsushima Strait (coast), with respect to habitat conditions during the summer, from 2015 to 2017. Sardine in the offshore area had larger bodies and higher lipid contents than those in the coastal area. Regarding the sardine diet, lipid content of the offshore zooplankton was clearly higher than that of the coastal zooplankton. Hence, we found a positive effect of this dietary lipid content on sardine lipid content, suggesting that these lipid measurements could explain the trophic relationship between sardine and zooplankton. The higher lipid content in offshore zooplankton was mainly attributed to the abundance of large‐sized copepods and lower water temperatures. Such lipid measurements might involve habitat‐specific characteristics of zooplankton assemblage. In conclusion, compared to the coastal area, the offshore area is considered a more favorable habitat for the sardine in terms of lipid availability.

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Section: Discussionsupporting

confidence: 91%

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Yasuda

Kitajima

Hayashi

et al. 2021

Fisheries Oceanography

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“…In Engraulis anchoita (Argentine anchovy), anchovy egg cannibalism increases as copepod density decreases, suggesting that such cannibalism could be an extra source of energy needed for reproduction (Pájaro et al, 2007). Although adult Japanese anchovy can eat their own eggs and larvae (Hayashi, 1967), active cannibalism appears unrealistic (Baba et al, 2018; Yamamoto & Katayama, 2012). In the central Seto Inland Sea, the feeding habits of Japanese anchovy and Japanese sardine are similar, with both eating mainly zooplankton prey items (Yamamoto & Katayama, 2012).…”

Section: Discussionmentioning

confidence: 99%

Temporal variations in hatch date and early survival of Japanese anchovy (Engraulis japonicus) in response to environmental factors in the central Seto Inland Sea, Japan

Fujita

Yamamoto

Kono

et al. 2021

Fisheries Oceanography

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Reproductive success can be influenced by the match or mismatch between the spawning season and optimal environmental conditions for larval survival. However, it is challenging to understand how temporal factors affect population dynamics. In the central Seto Inland Sea, Hiuchi‐nada, western Japan, the recruitment of Japanese anchovy (Engraulis japonicus) has markedly decreased in the last decade. To explore the causes of this decline, egg survey and commercial catch data from 1994 to 2019 (26 years) between April and August were used to examine egg production, hatch date, and early survival in relation to environmental factors. Otolith microstructure analysis indicated that most landed larval and juvenile fish (recruits) hatched in May and June. Egg and recruit abundances were negatively correlated over the study period. The survival indices from hatching to recruitment were higher in waters at 16–24°C in a given season until the mid‐2000s. Thereafter, they decreased over the studied temperature range and remained relatively low over the last five years. The copepod nauplii densities from 2015 to 2019 were significantly higher than those from 2002 to 2005 due possibly to the effect of increasing temperature, but the ratio of copepod nauplii density to larval density in May and June from 2015 to 2019 was approximately 34% and 66% of those from 2002 to 2005, respectively. These findings and the hydrodynamic features of these waters suggest that the recent decline in recruit abundance is partly due to a decrease in larval survival in response to increasing intracohort competition for prey in early‐life stages.

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“…To identify the top‐down effects of small pelagic fish on mesozooplankton biomass, interannual variations in mesozooplankton wet weight were compared with the biomass of small pelagic fish in the coastal Sea of Japan. The dominant small pelagic fish species in the coastal Sea of Japan are Japanese sardine, Japanese anchovy, and Pacific round herring (Tian et al., 2014), and they mainly prey on zooplankton (Baba et al., 2018; Tanaka et al., 2006). The interannual variations in these biomasses within the study area were obtained from stock assessment reports after 1977 (Kurota et al., 2020; Muko et al., 2020; Yoda et al., 2020).…”

Section: Methodsmentioning

confidence: 99%

“…The dominant small pelagic fish species in the coastal Sea of Japan are Japanese sardine, Japanese anchovy, and Pacific round herring (Tian et al, 2014), and they mainly prey on zooplankton (Baba et al, 2018;Tanaka et al, 2006). The interannual variations in these biomasses within the study area were obtained from stock assessment reports after 1977 (Kurota et al, 2020;Muko et al, 2020;Yoda et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Long‐Term Variation in Mesozooplankton Biomass Caused by Top‐Down Effects: A Case Study in the Coastal Sea of Japan

Kodama

Igeta

Iguchi

2022

Geophysical Research Letters

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Mesozooplankton, mainly copepods, but also including cladocerans and tunicates, link primary production and higher trophic production in marine ecosystems and regulate the biogeochemical cycles of the ocean (Sommer & Stibor, 2002;Verity & Smetacek, 1996). Many species of fish prefer to feed on mesozooplankton (Robert et al., 2014), and the abundance of mesozooplankton is a key parameter in the recruitment processes of fish (Beaugrand et al., 2003). The metabolism and migration processes of mesozooplankton activate the elemental (carbon and nitrogen) cycles of the ocean known as "active flux" (

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Comparison of stomach contents between Japanese sardine <i>Sardinops melanostictus</i> and anchovy <i>Engraulis japonicus</i> using commercial fisheries together with the two species in the Japan Sea during spring

Cited by 5 publications

References 5 publications

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Temporal variations in hatch date and early survival of Japanese anchovy (Engraulis japonicus) in response to environmental factors in the central Seto Inland Sea, Japan

Long‐Term Variation in Mesozooplankton Biomass Caused by Top‐Down Effects: A Case Study in the Coastal Sea of Japan

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