Horizontal distribution and habitat of Pacific bluefin tuna, <i>Thunnus orientalis,</i> larvae in the waters around Japan

Ohshimo, Seiji; Tawa, Atsushi; Ohta, Tomoko; Nishimoto, Satoru K.; Ishihara, Taiki; Watai, Mikio; Satoh, Keisuke; Tanabe, Toshiyuki; Abe, Osamu

doi:10.5343/bms.2016.1094

Cited by 48 publications

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“…In the Japan Sea (Sea of Japan), which is a marginal sea of the western North Pacific, the Tsushima Warm Current (TWC) flows from west (connected to the East China Sea at the Tsushima Strait) to east (connected to the western North Pacific and the Okhotsk Sea at the Tsugaru and Soya straits, respectively). The TWC has three branches (Kawabe, 1982): the coastal (first) branch (CBTWC) flows along the Japanese T. Kodama et al: Zooplankton community in the coastal Japan Sea coast following the shelf edge; the second branch flows on the offshore side of the first branch; the third branch (also known as East Korean Warm Current) flows along the Korean Peninsula up to ∼ 39 • N. The TWC transport affects climate and marine systems in the Japan Sea and the Japanese Archipelago (Hirose et al, 1996(Hirose et al, , 2009Isobe et al, 2002;Onitsuka et al, 2010;Kodama et al, 2015Kodama et al, , 2016, and is the spawn and nursery field of important fisheries' resources (Goto, 1998(Goto, , 2002Kanaji et al, 2009;Ohshimo et al, 2017).…”

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confidence: 99%

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

et al. 2018

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Abstract. This study evaluates spatial variations in zooplankton community structure and potential controlling factors along the Japanese coast under the influence of the coastal branch of the Tsushima Warm Current (CBTWC). Variations in the density of morphologically identified zooplankton in the surface layer in May were investigated for a 15-year period. The density of zooplankton (individuals per cubic meter) varied between sampling stations, but there was no consistent west–east trend. Instead, there were different zooplankton community structures in the west and east, with that in Toyama Bay particularly distinct: Corycaeus affinis and Calanus sinicus were dominant in the west and Oithona atlantica was dominant in Toyama Bay. Distance-based redundancy analysis (db-RDA) was used to characterize the variation in zooplankton community structure, and four axes (RD1–4) provided significant explanation. RD2–4 only explained < 4.8 % of variation in the zooplankton community and did not show significant spatial difference; however, RD1, which explained 89.9 % of variation, did vary spatially. Positive and negative species scores on RD1 represent warm- and cold-water species, respectively, and their variation was mainly explained by water column mean temperature, and it is considered to vary spatially with the CBTWC. The CBTWC intrusion to the cold Toyama Bay is weak and occasional due to the submarine canyon structure of the bay. Therefore, the varying bathymetric characteristics along the Japanese coast of the Japan Sea generate the spatial variation in zooplankton community structure, and dominance of warm-water species can be considered an indicator of the CBTWC.

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Section: Introductionmentioning

confidence: 99%

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

et al. 2018

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“…Water temperature plays an important role for the distribution of PBF larvae (Ohshimo et al, ). It has been reported that water temperature at stations where PBF larvae occurred in the Nansei Islands area and Sea of Japan are around 23.2–29.5 and 23.3–28.8°C, respectively (Ohshimo et al, ). In the present study, SST at the PBF present stations ranged from 26.3 to 28.2 ºC, which is relatively higher than those in the Nansei Islands area and Sea of Japan.…”

Section: Discussionmentioning

confidence: 99%

“…have reported that the actively spawning females were mainly present in late May to early July and a few females in late August. Water temperature where matured PBF were collected in Kuroshio-Oyashio transition area (21.0-25.5°C) was relatively lower than the water temperature where PBF larvae were distributed (24-29°C; Ohshimo et al, 2017). Therefore, we conducted larval surveys in early August when water temperature is assumed to be relatively high.…”

Section: Materials S and Me Thodsmentioning

confidence: 99%

Occurrence of Pacific bluefin tuna Thunnus orientalis larvae off the Pacific coast of Tohoku area, northeastern Japan: Possibility of the discovery of the third spawning ground

Tanaka

Tawa

Ishihara

et al. 2019

Fisheries Oceanography

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Recently, based on the histological studies it is suggested that Pacific bluefin tuna (PBF) spawns in the Kuroshio–Oyashio transition, off the Pacific coast of northeastern Japan, in addition to the previously identified two spawning areas of the northwestern Pacific around the Nansei Islands and the Sea of Japan. Distributional surveys for PBF larvae have not been conducted in the Kuroshio–Oyashio transition, and thus, we conducted PBF larval surveys at twenty stations in this area in early August 2018 to obtain evidence for the spawning of PBF. Twelve PBF larvae (3.9–7.2 mm in body length) were collected at six stations where sea surface temperature ranged from 27.2 to 28.2°C. Otolith microstructure analysis indicated that age of these larvae ranged from 4 to 11 days after hatching and the larvae hatched in late July. Growth of the collected larvae was comparable to those in the other two spawning grounds. Therefore, PBF spawns, hatches, and at least survives to the postflexion stage, 11 days after hatching in the Kuroshio–Oyashio transition. This fact potentially has a large impact on recruitment processes of PBF if they survive to recruitment in this third spawning ground.

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“…Two main spawning grounds (Ohshimo et al., ) and seasons are observed for PBF (Shimose & Farley, ), with one in the southwestern North Pacific Ocean near the Nansei Islands (Figure ) from April to June (Ashida, Suzuki, Tanabe, Suzuki, & Aonuma, ; Shimose, Aonuma, Suzuki, & Tanabe, ; Shimose, Aonuma, Tanabe, Suzuki, & Kanaiwa, ) and another in the Sea of Japan from June to August (Ohshimo et al., ; Okochi, Abe, Tanaka, Ishihara, & Shimizu, ). Larval PBF hatch in the main spawning area around the Nansei Islands and are passively transported to the nursery areas near the southern coast of Honshu, including Tosa Bay, by a combination of mesoscale eddies and the Kuroshio Current (Kitagawa et al., ; Satoh, ; Satoh, Tanaka, & Iwahashi, ).…”

Section: Introductionmentioning

confidence: 99%

Interannual variation of the diet shifts and their effects on the fatness and growth of age‐0 Pacific bluefin tuna (Thunnus orientalis) off the southwestern Pacific coast of Japan

Hiraoka

Fujioka

Fukuda

et al. 2019

Fisheries Oceanography

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We investigated the effect of feeding habits on the fatness (length–weight relationship (LW)) and otolith growth of age‐0 Pacific bluefin tuna (PBF) (fork length (FL) of 15.0–29.9 cm) collected off the southwestern Pacific coast of Japan from July to August during 2010–2015. The feeding rate on Clupeiformes (FRc) was substantially influenced by the path of the Kuroshio Current during early summer. We suggest that the following patterns occurred in the feeding habits of PBF. In 2012 and 2014, the short distance from the coast to the Kuroshio provided high overlap between PBF and Clupeiformes and increased the opportunity for feeding, and this pattern likely caused the observed diet shift from Crustacea to Clupeiformes by smaller PBF in the studied years than those in other years. In 2011 and 2015, the encounter probability for Clupeiformes might have been low due to the long distance to the Kuroshio Current, which led PBF to actively consume non‐Clupeiformes Teleostei. In contrast, in August 2010 and 2015, PBF did not encounter Clupeiformes or other Teleostei and may have been forced to feed on a large number of Crustacea; this effect was likely due to high water temperatures. Despite the interannual fluctuation in the timing of the diet shift and the feeding intensity (FI), these factors did not contribute to growth in length; rather, they contributed to fatness. Considering size‐dependent mortality in the larval stage, these results suggest that only fast‐growing individuals survive, even if the feeding conditions drastically change.

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Horizontal distribution and habitat of Pacific bluefin tuna, Thunnus orientalis, larvae in the waters around Japan

Cited by 48 publications

References 0 publications

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Occurrence of Pacific bluefin tuna Thunnus orientalis larvae off the Pacific coast of Tohoku area, northeastern Japan: Possibility of the discovery of the third spawning ground

Interannual variation of the diet shifts and their effects on the fatness and growth of age‐0 Pacific bluefin tuna (Thunnus orientalis) off the southwestern Pacific coast of Japan

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