Annual reproductive cycle of the oyster,Saccostrea kegaki(Torigoe &amp; Inaba 1981) on the southern coast of Jeju island, Korea

Kim, Bong-Kyu; Kang, Do‐Hyung; Ko, Dae-Kwon; Yang, Hyun-Sung; Kim, Daekyung; Kang, Chang‐Keun; Choi, Kwang-Sik

doi:10.1080/07924259.2010.9652312

Cited by 19 publications

(12 citation statements)

References 18 publications

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“…In April, when the surface water temperature reached 17°C, 6.3% of the female oysters and 37.5% of male oysters were at an early development stage, exhibiting early vitellogenic oocytes and spermatogonia (Kim et al, 2010). Food supply in this period that used the amount of carbohydrate at a minimum (Shafakatullah, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…In the late-developing gonad, the follicles of males and females expanded and in areas between the mantle and the digestive gland. In the oogenic follicle, the oocytes are larger than in the preceding stage and are characterized by the long thin stalk that connects them to the follicular wall (Kim et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…As shown in Figure 5, S. kegaki initiated oogenesis in April when http://jurnal.unsyiah.ac.id/AJAS the water temperature reached 16.5°C and first partially spawned individuals were observed in July when the water temperature reached 26.7°C. (Kim et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

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Gonad maturity of simping Placuna placenta, Linn 1758 (Bivalve: Placunidae) harvested from Kronjo Coastal, Indonesia

Yonvitner¹,

Setyobudiandi²,

Dahuri³

et al. 2019

Aceh J. Anim. Sci.

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Simping (P. placenta) is a coastal resource found in shallow water with a muddy substrate. Simping widely used as a source of food and as raw material for the decoration. Utilization of simping until now has not yet focused on recruitment, reproductive aspect. This information is important as a basis data for determining the size of the simping catch. This study aimed to find out about of reproduction aspect, determining sex ratio the size of the catch simping. This research was conduct for three months at 3 locations. The number of samples in the analysis is 36 species to determine sex ratio and gonad maturity. Sex ratio indifferent from male and female, but based on the time sex ratio of simping significant, both male and female. The length size of gonads shellfish matures form 5.50 cm and 5.85 cm at 2 TKG conditions. Length of simping mature from 6.08 cm, 6.24 cm, 6.45 cm and 7.11 cm dominant at TKG mature stage 3, and 8.61 cm dominant at 4 TKG conditions. Sex ratio reaches 6 cm shell length and not significant between males and females (M: F=1;1). It is concluded that the level of maturity of gonads increases with increasing of simping size.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Gonad maturity of simping Placuna placenta, Linn 1758 (Bivalve: Placunidae) harvested from Kronjo Coastal, Indonesia

Yonvitner¹,

Setyobudiandi²,

Dahuri³

et al. 2019

Aceh J. Anim. Sci.

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“…(Torigoe, 1999Okutani, 2000와 Morozaki (Lam and Morton, 2006)를 비롯하여 대만 (Taiwan malacofauna database, http://shell.sinica.edu.tw), 필리핀 (Poppe, 2010) 과 같은 아열대 지역에 서식하며 우리나라에서는 제주도에 유일하게 보고되고 있다 (Choi et al 2000;Min, 2004;Kim et al 2010;Yang and Choi, 2011). 가시굴 각장의 크기는 2-5 cm로 중·소형이며, 제주지역의 경우 주로 용천수가 분포하는 조간대 지역에 밀집하여 서식하고 있다.…”

unclassified

First observation on the early embryonic and larval development of spiny oyster Saccostrea kegaki Torigoe & Inaba, 1981 (Bivalvial: Ostreoida) using scanning electron microscope on the north coast of Jeju, Korea

Lee¹,

Kang²,

Jeung³

et al. 2013

The Korean Journal of Malacology

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“…Although S. kegaki Torigoe &Inaba, 1981 andS. mordax (Gould, 1850) are commonly found in western Japan, only a few studies have been conducted on these species, including studies on their taxonomy (Lam & Note Morton 2006, Sekino & Yamashita 2016, population ecology (Ohgaki 2013), and reproductive cycle (only in S. kegaki, Kim et al 2010). The potential of Saccostrea oysters to change sex in both directions is unknown.…”

mentioning

confidence: 99%

Direct evidence of bi-directional sex change in natural populations of the oysters Saccostrea kegaki and S. mordax

Yasuoka

Yusa

2017

Plankton Benthos Res

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Two Saccostrea oysters (S. glomerata and S. cucullata) are considered to be protandric hermaphrodites based on indirect observations. However, no other information is available on the sexual systems of Saccostrea oysters and the potential for bidirectional sex change has not previously been reported in them. Therefore, the present study was undertaken to investigate the sexual systems of S. kegaki and S. mordax in western Japan, utilizing field sampling and in situ experiments. In the field sampling, shell length (SL) and sex were determined during the reproductive season of these oysters (June-October) in 2012. Then, sex change was directly observed between 2013 and 2016 by determining the sex of individuals through gonadal biopsy, re-attaching the individuals in the field, collecting the survivors in the following year, and determining their sex by dissection. In both species, the proportion of males decreased with increasing SL, although the SL of males and females greatly overlapped. Direct observations showed that both male-to-female and female-to-male sex change occurred. Thus, our results indicated that both Saccostrea species tend to be protandric, but have the ability to change sex in both directions under natural conditions.

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Annual reproductive cycle of the oyster,Saccostrea kegaki(Torigoe & Inaba 1981) on the southern coast of Jeju island, Korea

Cited by 19 publications

References 18 publications

Gonad maturity of simping Placuna placenta, Linn 1758 (Bivalve: Placunidae) harvested from Kronjo Coastal, Indonesia

Gonad maturity of simping Placuna placenta, Linn 1758 (Bivalve: Placunidae) harvested from Kronjo Coastal, Indonesia

First observation on the early embryonic and larval development of spiny oyster Saccostrea kegaki Torigoe & Inaba, 1981 (Bivalvial: Ostreoida) using scanning electron microscope on the north coast of Jeju, Korea

Direct evidence of bi-directional sex change in natural populations of the oysters <i>Saccostrea kegaki</i> and <i>S. mordax</i>

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