Differences in larval growth of Pacific bluefin tuna (Thunnus orientalis) between two spawning areas, and an evaluation of the growth-dependent mortality hypothesis

Ishihara, Taiki; Watai, Mikio; Ohshimo, Seiji; Abe, Osamu

doi:10.1007/s10641-019-00855-w

Cited by 20 publications

(19 citation statements)

References 40 publications

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“…Median of back‐calculated BL of the PBF larvae collected in our study (Figure ) was comparable to those collected around Nansei Islands area and in Sea of Japan (Ishihara et al, ; Tanaka et al, ). PBF larvae collected in Nansei Island area grew to approximately 3.8 mm BL at 5 DAH and 6.1 mm BL at 10 DAH (Tanaka et al, ).…”

Section: Discussionsupporting

confidence: 85%

“…PBF larvae collected in Nansei Island area grew to approximately 3.8 mm BL at 5 DAH and 6.1 mm BL at 10 DAH (Tanaka et al, ). In Ishihara et al (), median of back‐calculated BL of larval PBF collected in Nansei Island area was ca. 4.0 mm at 5 DAH and 6.5 mm at 10 DAH, and that in Sea of Japan was ca.…”

Section: Discussionmentioning

confidence: 99%

“…Age and hatch date of larvae were estimated according to Itoh, Shiina, Tsuji, Endo, and Tezuka (2000). The biological intercept method (Campana, 1990) was used to back-calculate the growth trajectory in terms of body size at each day of age for each fish based on the relationship between OR and SL as described in Ishihara et al (2019) and Tanaka et al (2006). Twelve PBF larvae were collected at six stations ( Figure 2, Table 1).…”

Section: Materials S and Me Thodsmentioning

confidence: 99%

“…In the case of PBF, interannual variability of the recruitment is very high (Ishida et al, ; Muhling, Tommasi, Ohshimo, Alexander, & DiNardo, ; Yamada, Takagi, & Nishimura, ), and there is no relationship between the spawning stock biomass and recruitment of PBF during both periods of high and low levels of PBF stock (ISC, ). Recently, several studies have revealed that the survival and consequent recruitment success of larval PBF depends largely on their growth during the larval stage in the two well‐known spawning grounds (Ishihara, Watai, Ohshimo, & Abe, ; Tanaka, Satoh, Iwahashi, & Yamada, ; Watai et al, ; Watai, Ishihara, Abe, Ohshimo, & Strüssmann, ). To better understand the recruitment process and the variation in recruitment of PBF, surveys of the early life ecology of PBF are indispensable.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Materials S and Me Thodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The longer and earlier spawning season in the ECS spawning area relative to the SoJ may contribute to more recruits in the western Pacific [21]; however, this pattern was only found in two of the four years in the CCLME. Given that growth and survival of PBT are related to sea surface temperature (SST) and prey availability at the early-life stage [23,24], future research should examine relationships between early-life survival and environmental conditions within each spawning area relative to recruitment into the CCLME.…”

Section: Discussionmentioning

confidence: 99%

Natal origin of Pacific bluefin tuna from the California Current Large Marine Ecosystem

et al. 2020

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Natal origin of subadult (age-1) Pacific bluefin tuna (PBT, Thunnus orientalis ) from the California Current Large Marine Ecosystem (CCLME) was determined using natural tracers in ear stones (otoliths). Age-0 PBT collected from the two known spawning areas in the western Pacific Ocean (East China Sea, Sea of Japan) were used to establish baseline signatures from otolith cores over 4 years (2014–2017) based on a suite of trace elements (Li, Mg, Mn, Sr, Zn and Ba). Distinct chemical signatures existed in the otolith cores of age-0 PBT collected from the two spawning areas, with overall classification accuracy ranging 73–93% by year. Subadult PBT collected in the CCLME over the following 4 years (2015–2018) were then age-class matched to baselines using mixed-stock analysis. Natal origin of trans-Pacific migrants in the CCLME ranged 43–78% from the East China Sea and 22–57% from the Sea of Japan, highlighting the importance of both spawning areas for PBT in the CCLME. This study provides the first estimates on the natal origin of subadult PBT in this ecosystem using otolith chemistry and expands upon the application of these natural tracers for population connectivity studies for this species.

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Spawning site distribution of a bluefin tuna reduces jellyfish predation on early life stages

Ottmann

Fiksen

Martín

et al. 2021

Limnology & Oceanography

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Bluefin tunas across the world migrate long distances to spawn in particularly warm and oligotrophic areas constrained by oceanographic fronts. The low abundance of predators in these areas increases survival chances of their early life stages, but its importance for choice of spawning habitat is unknown. Here, we use estimated clearance rates and data on spatial distributions of Atlantic bluefin tuna larvae Thunnus thynnus and metaephyrae of the jellyfish Pelagia noctiluca to quantify predation at a major spawning ground in the Mediterranean Sea. We found that high densities of P. noctiluca can rapidly deplete tuna eggs and preflexion larvae, but their patchy distribution and low spatial and temporal overlap results in overall low predation. The specific distribution of the spawning sites suggests that bluefin tunas may use local oceanography as cues to spawn outside areas with high predator densities.

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Differences in larval growth of Pacific bluefin tuna (Thunnus orientalis) between two spawning areas, and an evaluation of the growth-dependent mortality hypothesis

Cited by 20 publications

References 40 publications

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

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

Natal origin of Pacific bluefin tuna from the California Current Large Marine Ecosystem

Spawning site distribution of a bluefin tuna reduces jellyfish predation on early life stages

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