Feeding habits of the mesopelagic fish Sigmops gracilis larvae in the Kuroshio and its adjacent water, southern Japan

Yoshinaga, Shohei; Kobari, Toru; Tanonaka, Norika; Yamanoue, Kaori; Kume, Gen

doi:10.1007/s10228-020-00760-8

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…For metabarcoding, we used 292 individuals from 22 mesozooplankton groups, including 13 copepod families for gut-content analysis (Table 1), and six filters from water samples for ambient prey of mesozooplankton. These mesozooplankton groups, and copepods in particular, are predominant components of the mesozooplankton community 18,19 , and are prey items for fish larvae in the Kuroshio and its neighboring waters 7,20 . These individuals were widely collected from stations ranging from the continental slope waters to offshore of the Kuroshio path (Supplementary Table S1).…”

Section: Methodsmentioning

confidence: 99%

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Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters

Kobari

Tokumo

Sato

et al. 2021

Sci Rep

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Trophic sources and pathways supporting early life stages are crucial for survival of forage fishes recruiting around the oligotrophic and unproductive Kuroshio. However, information is limited for the Kuroshio planktonic food web and its trophodynamics because of its high biodiversity. Here, we explore trophic sources and linkages in the Kuroshio plankton community using metabarcoding analysis of gut-content DNA for 22 mesozooplankton groups. The major prey was dinoflagellates and calanoids for omnivorous groups, and calanoids and gelatinous organisms for carnivorous groups. Larvaceans and hydrozoans were the most frequently appeared prey for both omnivores and carnivores, whereas they were minor constituents of the available prey in water samples. Although calanoids overlapped as major prey items for both omnivores and carnivores because they were the most available, contributions from phytoplankton and gelatinous prey differed among taxonomic groups. Further analysis of the metabarcoding data showed that in addition to omnivorous copepods like calanoids, gelatinous groups like larvaceans and hydrozoans were important hubs in the planktonic food web with their multiple trophic linkages to many components. These findings suggest that gelatinous organisms are important as supplementary prey and provide evidence of niche segregation on trophic sources among mesozooplankton groups in the Kuroshio.

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Section: Methodsmentioning

confidence: 99%

“…These small protists are consumed by micro-and mesozooplankton communities [15][16][17] . Mesozooplankton dominated by small calanoid copepods 18,19 are then major prey items for fish larvae 7,20 . Thereby, mesozooplankton is likely functioning as a hub to integrate various trophic sources and allocate prey for fish larvae in the ECS-Kuroshio.…”

mentioning

confidence: 99%

Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters

Kobari

Tokumo

Sato

et al. 2021

Sci Rep

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“…Appendicularians are important prey for fish larvae, including anguillids, scombrids, and some mesopelagic species (Mochioka and Iwamizu, 1996;Llopiz et al, 2010;Yoshinaga et al, 2021), and feed on bacteria and pico-to nano-autotrophs (e.g., Deibel, 1998;Flood and Deibel, 1998;Gorsky and Fenaux, 1998). In the study area, appendicularians are not dominant in the mesozooplankton assemblage (Kobari et al, 2020), indicating that S. japonicus larvae must feed selectively on them.…”

Section: Larval Feeding Habitsmentioning

confidence: 99%

Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan

et al. 2021

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To evaluate the importance of the northern Satsunan area in southern Japan as a spawning and nursery ground for chub mackerel (Scomber japonicus), we investigated the early life history characteristics (e.g., larval distribution, feeding habits, and growth) of S. japonicus over five successive years. This area is considered the main habitat and spawning ground of the congeneric species, S. australasicus. Using polymerase chain reaction-restriction fragment length polymorphism analysis, we first confirmed that S. japonicus larvae were abundant in the northern Satsunan area, potentially representing a major spawning and nursery ground in the Japanese Pacific coastal area. The number of recorded larvae started to increase in 2016, corresponding to the population dynamics of the Pacific stock of the species, which has shown increasing trends in recent years. Morphological and DNA metabarcoding analyses of gut contents and stable isotope analysis showed that, in addition to copepods, the larvae fed substantially on appendicularians. The trophic pathway involving appendicularians might support the feeding habits of S. japonicus, promoting its coexistence with other dominant species. Both the instantaneous growth rate and daily specific growth rate were comparable to those in the southern East China Sea, which is the main spawning and nursery ground of the species. Our data strongly suggest that the northern Satsunan area has favorable conditions for sustaining high larval population densities, even during phases with high population numbers. Our results provide insights for the fisheries management for S. japonicus in the Japanese Pacific coastal area, especially during high-stock periods.

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Occurrence patterns of larval mesopelagic fishes in the mouth of highly eutrophic Tokyo Bay, central Japan

2022

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Feeding habits of the mesopelagic fish Sigmops gracilis larvae in the Kuroshio and its adjacent water, southern Japan

Cited by 6 publications

References 35 publications

Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters

Metabarcoding analysis of trophic sources and linkages in the plankton community of the Kuroshio and neighboring waters

Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan

Occurrence patterns of larval mesopelagic fishes in the mouth of highly eutrophic Tokyo Bay, central Japan

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