Comparison of feeding habits of myctophid fishes and juvenile small epipelagic fishes in the western North Pacific

Takagi, Kaori; Yatsu, Akihiko; Itoh, Hiroshi; Moku, Masatoshi; Nishida, Hiroshi

doi:10.1007/s00227-008-1115-8

Cited by 34 publications

(28 citation statements)

References 29 publications

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“…(2009) used a c = 0.24 and K 22 = 0.05. In addition, for prey selectivity, we assumed that sardine juveniles prey only on mesozooplankton without phytoplankton, based on a recent report (Takagi et al. , 2009).…”

Section: Methodsmentioning

confidence: 99%

“…In comparison, Okunishi et al (2009) used a c = 0.24 and K 22 = 0.05. In addition, for prey selectivity, we assumed that sardine juveniles prey only on mesozooplankton without phytoplankton, based on a recent report (Takagi et al, 2009). The relationship between the fish wet weight (W, wet-g) and the body length (BL cm) is defined as Kondo et al, 1976).…”

Section: Fish Movement Modelmentioning

confidence: 99%

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A modeling approach to evaluate growth and movement for recruitment success of Japanese sardine (Sardinops melanostictus) in the western Pacific

Okunishi

Ito

Ambe

et al. 2011

Fisheries Oceanography

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A two-dimensional individual-based fish movement model coupled with fish bioenergetics was developed to simulate the observed migration and growth of Japanese sardine (Sardinops melanostictus) in the western North Pacific. In the model, derived from the observed ocean-environmental data as the driving force, fish movement was adapted as a kinesis behavior. The model successfully simulated the observed transport patterns during the egg and larval stages and the northward migrations during the juvenile stage in 2005, 2006 and 2007. The model results showed that both temperature during the larval stage in the Kuroshio Extension and the prey availability during the early juvenile stage in the Kuroshio-Oyashio transitional area are important factors for growth of Japanese sardine. In autumn, the observed juvenile sardine were mainly distributed in the subarctic water region off the Kuril Islands, which is an area (158-165°E, 43-47°N) with a high chlorophyll-a (Chl-a) concentration. The model reproduced the fish distribution, which has a high density in this region. The high Chl-a concentration area in autumn may contribute to increasing the survival rate of Japanese sardine by cascading up the food chain, from the high primary production, and is an important habitat for recruitment success of Japanese sardine.

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Section: Methodsmentioning

confidence: 99%

Section: Fish Movement Modelmentioning

confidence: 99%

A modeling approach to evaluate growth and movement for recruitment success of Japanese sardine (Sardinops melanostictus) in the western Pacific

Okunishi

Ito

Ambe

et al. 2011

Fisheries Oceanography

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“…Thus, appendicularians are an important prey resource for D. garmani from larvae to adults around the north-western Pacific Ocean and its adjacent waters. Feeding on appendicularians was also reported for other migratory myctophids such as prickly lanternfish Myctophum asperum Richardson 1845 (Watanabe et al ., 2002;Takagi et al ., 2009). On the other hand, results suggest that D. chrysorhynchus has a low selectivity and feeds on zooplankton, cephalopods and fishes.…”

Section: I E T C O M P O S I T I O N a N D P R E Y S I Z Ementioning

confidence: 99%

Feeding ecology of two lanternfishes Diaphus garmani and Diaphus chrysorhynchus

Tanaka

Sassa

Ohshimo

et al. 2013

Journal of Fish Biology

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The feeding ecology of two dominant lanternfishes Diaphus garmani and Diaphus chrysorhynchus was studied in the continental slope region of the East China Sea, off western Kyushu (31-33° N; 128-130° E). Stomach contents of D. garmani were composed mainly of crustacean zooplankton, such as copepods, euphausiids, decapod larvae and amphipods, and also of appendicularians. Stomach contents of D. chrysorhynchus were composed mainly of crustacean zooplankton, cephalopods and fishes. Diel changes in stomach fullness indicated that D. garmani fed more actively at night than in the day. On the other hand, although feeding activity of D. chrysorhynchus did not change drastically between day and night, it tended to feed on large prey items in the benthopelagic zone during the day and on zooplankton in the epipelagic zone at night. Daily rations of food were estimated to be 2·54% of body dry mass for D. garmani, and 2·38% of body dry mass for D. chrysorhynchus.

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“…and the species is one of the most important prey items of their larvae and juveniles (e.g. Takagi et al 2009). Taxonomic information concerning the species complex is thus critically important to discuss the food environment of those commercially important fishes; therefore, attempts have been made to confirm their taxonomic status (e.g.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of the <i>Paracalanus parvus</i> species complex in offshore waters south of Japan and their genetic and morphological identification to species

Hidaka

Itoh²,

Hirai

et al. 2016

Plankton Benthos Res

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Abstract:The Paracalanus parvus species complex is one of the most dominant and ecologically important copepod groups in the waters around Japan. However, the overall taxonomic classification of the species complex has not been sufficiently defined to date. In this study, both genetic and morphological analyses were performed on specimens of the P. parvus species complex collected along the O-line , a monitoring line located at 138°E, south of Japan. Among the individuals collected, P. nanus specimens were clearly distinguishable morphologically, whereas other specimens could be classified into three reproductively isolated species. These distinctions are based on genetic analyses of the mitochondrial cytochrome oxidase subunit I (mtCOI) and nuclear large subunit (nLSU) ribosomal RNA. By comparing the genetic and morphological data with findings from previous studies, these three species were identified as P. tropicus, P. indicus, and an as-yet undescribed species (Paracalanus sp. (NWP)). The latter possesses a humped forehead and was found to be a dominant species within the surveyed continental slope area. As a distinguishing characteristic, the humped forehead was not consistently useful as it was prominent in only about half of the individuals collected. Morphological discrimination between this species and P. indicus was only made possible by comparing the relative length of exopod segment 3 on swimming leg 4. Despite morphological similarities among member species, ecological studies on the P. parvus species complex conducted around Japan may mostly concern the undescribed species, Paracalanus sp. (NWP), considering that P. indicus was found only in warmer waters in this study.

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Comparison of feeding habits of myctophid fishes and juvenile small epipelagic fishes in the western North Pacific

Cited by 34 publications

References 29 publications

A modeling approach to evaluate growth and movement for recruitment success of Japanese sardine (Sardinops melanostictus) in the western Pacific

A modeling approach to evaluate growth and movement for recruitment success of Japanese sardine (Sardinops melanostictus) in the western Pacific

Feeding ecology of two lanternfishes Diaphus garmani and Diaphus chrysorhynchus

Occurrence of the <i>Paracalanus parvus</i> species complex in offshore waters south of Japan and their genetic and morphological identification to species

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