Distribution of Todarodes pacificus (Cephalopoda: Ommastrephidae) paralarvae near the Kuroshio off southern Kyushu, Japan

Bower, John R.; Nakamura, Y.; Mori, Ken; Yamamoto, Jun; Isoda, Yutaka; Sakurai, Yasunori

doi:10.1007/s002270050606

Cited by 49 publications

(40 citation statements)

References 16 publications

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“…Under laboratory conditions, paralarvae continue to grow, consuming the inner yolk. However, since the first feeding prey of squid paralarvae have not yet been identified (Bower et al, 1999), after reaching stage 34 and once the inner yolk is completely utilized, the paralarvae starve to death in the laboratory (Watanabe et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Observations on the spawning behavior, egg masses and paralarval development of the ommastrephid squid Todarodes pacificus in a laboratory mesocosm

Puneeta

Vijai

Yoo

et al. 2015

Journal of Experimental Biology

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The spawning behavior of ommastrephid squids has never been observed under natural conditions. Previous laboratory observations of Japanese flying squid (Todarodes pacificus) suggest that prespawning females might rest on the continental shelf or slope before they ascend above the pycnocline to spawn, and that the egg masses might settle in the pycnocline. Here, two mesocosm experiments were conducted in a 300 m 3 tank that was 6 m deep to investigate this hypothesis. In the first experiment, a thermocline (2.5-3.5 m) was established in the tank by creating a thermally stratified (17-22°C) water column. In the second experiment, the temperature was uniform (22°C) at all depths. Prior to spawning, females did not rest on the tank floor. In the stratified water column, egg masses remained suspended in the thermocline, but in an unstratified water column, they settled on the tank bottom, collapsed and were infested by microbes, resulting in abnormal or nonviable embryos. Eleven females spawned a total of 18 egg masses (17-80 cm in diameter), indicating that females can spawn more than once when under stress. Paralarvae hatched at stage 30/31 and survived for up to 10 days, allowing us to observe the most advanced stage of paralarvae in captivity. Paralarvae survived after consumption of the inner yolk, suggesting they might have fed in the tank.

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Section: Introductionmentioning

confidence: 99%

Observations on the spawning behavior, egg masses and paralarval development of the ommastrephid squid Todarodes pacificus in a laboratory mesocosm

Puneeta

Vijai

Yoo

et al. 2015

Journal of Experimental Biology

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Section: Discussionmentioning

confidence: 99%

“…The oceanography of the spawning and hatching region, and particularly an association between paralarvae and frontal regions has been shown to be important in influencing recruitment in a number of ommastrephid species, e.g. Todarodes pacificus paralarvae show high abundance to the north of the Kuroshio front (Bower et al 1999), Illex illecebrosus are associated with the Gulf Stream front (Rowell & Trites 1985), and I. argentinus with the Brazil Current front (Waluda et al 2001).El Niño and La Niña events are likely to influence the size and position of the Costa Rica Dome (Fiedler 2002), and thus the area available for spawning and development. The highest levels of hatchingfavourable SST were observed during 1993, 1999 and 2000, corresponding to normal and cooler years, and potentially a larger and more productive Costa Rica Dome (Fiedler 2002).…”

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confidence: 99%

Remotely sensed mesoscale oceanography of the Central Eastern Pacific and recruitment variability in Dosidicus gigas

Waluda¹,

Rodhouse²

2006

Mar. Ecol. Prog. Ser.

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The Jumbo flying squid Dosidicus gigas has a short life span and is subject to rapid changes in population size. This species inhabits the Eastern Pacific, one of the most variable oceanic environments in the world, subject to the El Niño Southern Oscillation (ENSO). This study examined the influence of environmental variability on squid abundance off Peru using mesoscale oceanographic indicators derived from remotely sensed satellite imagery. In the fishery area off Peru, squid abundance was positively associated with sea surface temperatures (SST) between 17 and 22°C during July, corresponding to the peak of the fishery season. In the putative hatching area close to the Costa Rica Dome, squid abundance was positively associated with SST of between 24 and 28°C during September, prior to the start of the fishery season. Squid abundance is apparently strongly influenced by mesoscale variability linked to ENSO, with low levels of upwelling during the very strong El Niño of 1997 to 1998 leading to very low catches of squid off Peru. Variability in upwelling off Peru and in the Costa Rica Dome region may drive primary and secondary production and transport processes affecting the planktonic early life stages and also the availability of food and suitable habitat for adult squid.KEY WORDS: Costa Rica Dome · Dosidicus gigas · El Niño Southern Oscillation · Eastern Pacific · Fishery · Flying squid · Mesoscale oceanography · Upwelling Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 310: [25][26][27][28][29][30][31][32] 2006 lower thermocline, the upwelling of cool, nutrient-rich waters, and high primary productivity (Barber & Chavez 1983, Carr et al. 2002. During warming (El Niño) events, the trade winds weaken and are replaced by westerlies at low latitudes (Longhurst 1998). In addition, the thermocline is depressed and upwelling consists of nutrient-depleted waters, such that productivity is reduced (Barber & Chavez 1983, Huyer et al. 1987. At the equator, 3 currents arise, the westward-flowing North and South Equatorial Currents, and the eastward-flowing Equatorial Counter Current, which bifurcates as it nears the continental margin, giving rise to the Costa Rica Dome. The Dome is an area where the generally strong and shallow thermocline of the eastern tropical Pacific becomes even shallower, with cold nutrient-rich water occurring close to the surface (Wyrtki 1964, Fiedler 2002. This is an area of high productivity, with a regional maximum in chlorophyll concentration in surface waters from May to September, and an associated high abundance of zooplankton (Fiedler 2002).Dosidicus gigas is a eurythermic species, with a usual temperature range of between 15 and 28°C (Nesis 1983), although squid have been found to tolerate extremes of between 4 and 32°C in the deep ocean and equatorial waters respectively (Nigmatullin et al. 2001). The highest concentrations of squid have been recorded at temperatures of between 24 and 29°C in the northern hemisphere (Nesis ...

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“…일본에서는 이 종에 대한 연구가 1960년대부터 시작되어, 살오징어 유생의 분포특성 (Okutani, 1965(Okutani, , 1968(Okutani, , 1969, 유생조 사를 통한 겨울산란군의 자원평가 (Okutani and Watanabe, 1983), 알과 유생의 발단단계 , 사육수조 내에서의 난괴관찰 , 환경변화에 따른 산란 장 변동 (Sakurai et al, , 2000, 큐슈 남서부 해역에서의 유생분포 특성 (Bower et al, 1999), 살오징어 유생의 초기 계통발생 특성 (Shigeno et al, 2001), 동해 남부해역에서의 유생분포 (Goto, 2002), 동해 남서부해역에서의 살오징어 수 평･수직 분포 특성 (Yamamoto et al, 2002(Yamamoto et al, , 2007) 등 성어어획 과 해황과의 관계뿐만 아니라, 산란 특성과 유생발생 및 유생 분포특성 등 이들의 초기생활사에 관한 연구가 활발하였다. 특히 동해 남부의 일본 측 해역과 큐슈 남서부 해역에서 살오 징어 유생조사가 각각1973년과 1998년부터 지속적으로 수행 되고 있으며, 이를 바탕으로 해양환경 특성과 관련하여 유생 분포특성을 규명하는 연구가 수행되었다 (Bower et al, 1999;Goto, 2002 (Fig.…”

unclassified

“…특히 동해 남부의 일본 측 해역과 큐슈 남서부 해역에서 살오 징어 유생조사가 각각1973년과 1998년부터 지속적으로 수행 되고 있으며, 이를 바탕으로 해양환경 특성과 관련하여 유생 분포특성을 규명하는 연구가 수행되었다 (Bower et al, 1999;Goto, 2002 (Fig. 5c).…”

unclassified

Distribution of Larvae of the Common Squid Todarodes pacificus in the Northern East China Sea

Kim¹,

Lee²,

Kim³

et al. 2011

Korean Journal of Fisheries and Aquatic Sciences

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were examined. In addition, the vertical distribution was examined from the samples collected using a 1 m 2 MOCNESS in April 1999 (20 m interval down to 100 m). A total of 218 larvae ranging in mantle length (ML) from 1.2 to 17.0 mm were counted at 27 stations. Larval abundance was highest in May 2004. The larvae mainly occurred in the southeastern area of Jeju Island, where the water temperature and salinity at 50 m deep ranged from 15-23 ℃ and 34-34.6 psu, respectively. Most larvae were collected in the frontal zone, where the Tsushima Warm Current and inshore waters meet. The results from the MOCNESS samples showed that the larvae occurred mostly in 20-80 m depth ranges (about 90%), although collections were only conducted above 100 m. No significant differences in larval mantle lengths (ANOVA, P>0.05) were found among each depth interval. Given the occurrence sites of the larvae <2.0 mm ML, the spawning ground of this species appears to be within the northern East China Sea, mainly to the southeast and northeast of Jeju Island, in early spring.

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Distribution of Todarodes pacificus (Cephalopoda: Ommastrephidae) paralarvae near the Kuroshio off southern Kyushu, Japan

Cited by 49 publications

References 16 publications

Observations on the spawning behavior, egg masses and paralarval development of the ommastrephid squid Todarodes pacificus in a laboratory mesocosm

Observations on the spawning behavior, egg masses and paralarval development of the ommastrephid squid Todarodes pacificus in a laboratory mesocosm

Remotely sensed mesoscale oceanography of the Central Eastern Pacific and recruitment variability in Dosidicus gigas

Distribution of Larvae of the Common Squid Todarodes pacificus in the Northern East China Sea

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