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Hyun-Sung Yang Do-Hyung Kang Heung-Sik Park Kwang-Sik Choi 《Ocean Science Journal》2017,52(4):519-526
Widely distributed from the northern coast of Vietnam to the northern Japan, the limpet Cellana grata (Gould, 1859) occurs commonly on the south and east coasts of Korea. Despite their wide distribution range, few studies have investigated the annual gametogenesis and reproductive effort of C. grata. In an attempt to understand the reproductive physiology of the limpet, we investigated the annual gametogenesis and reproductive effort of C. grata from Ulleungdo Island off the east coast of Korea. Histology revealed that the gonial mitosis commenced in January, as the female exhibited small oogonia (10–40 μm) in the follicle. From March to June, the oocyte size increased dramatically, and fully mature eggs (110–170 μm in diameter) appeared in early summer. First spawning males and females were observed in July, as the surface seawater temperature (SST) reached 22.1°C. The spawning male and females could be observed until the end of December. Gonad somatic index (GSI), a ratio of gonad mass to the total tissue weight, of the male ranged from 0.6 (April) to 17.9 (July), while the female GSI varied from 1.0 (February) to 18.3 (July). GSI of male and female declined rapidly from July to August, suggesting that the major purse of the spawning at the study site was between July and August. Our study suggested that the commercial catch of C. grata during July and August must be suspended at Ulleungdo Island, in order to protect the spawning limpets, which enhances C. grata recruitment and the population. 相似文献
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Yang Hyun-Sung Hong Hyun-Ki Donaghy Ludovic Noh Choong-Hwan Park Heung-Sik Kim Dong-Sung Choi Kwang-Sik 《Ocean Science Journal》2015,50(1):77-85
Ocean Science Journal - Mytilus coruscus is a cold water mussel commonly occurring on shallow subtidal rocky substrata along the east coast of Korea. Despite its abundance, there have only been a... 相似文献
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The process of embryogenesis and larval development of the asteroid sea star Asterias amurensis (Lütken) was observed, with
special attention paid to morphological change and larval duration. In reproductive season, mature sea stars were collected
under floating net cages, located in Tongyeong, southern Korea. The mature eggs are 138 μm in average diameter, semi-translucent
and orange in color, sperms in good condition appear light cream to white-gray in color. Embryos develop through the holoblastic
equal cleavage stage and a wrinkled blastula stage that lasts about 9 hours after fertilization. Gastrulae bearing an expanded
archenteron hatch from the fertilization envelope 22 hours after fertilization. At the end of gastrulation, rudiments of the
left and right coelom are formed. By day 2, larvae possess complete alimentary canal and begin to feed. At this stage, the
larva is called early bipinnaria. In 6day-old larvae, the pre- and post- oral ciliated bands form complete circuits and the
bipinnarial processes start to develop. By day 12, the lateral and anterior projection of the larval wall processes along
the ciliated bands begins to thicken and curl, and the ciliated bands become more prominent. By day 32, early brachiolaria
are presented with three pairs of brachiolar arms. Advanced brachiolaria with a well-developed brachiolar complex (three pairs
of brachia and central adhesive disc) occur 6 weeks after fertilization. In the field, spawning of the sea star was observed
in April to May, settlement form larvae and just settlements seem to occur from June to July, and early juveniles occur from
August to September. Although we had not described the end of brachiolaria stage, it can be tentatively estimated that the
duration of the pelagic stage of A. amurensis is 40 to 50 days. 相似文献
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Hyun-Sung Yang Hyun-Sil Kang Heung-Sik Park Choong Hwan Noh Eui-Young Jeong Kwang-Sik Choi 《Ocean Science Journal》2015,50(4):649-655
Pen shell is one of the largest marine bivalves inhabiting shallow subtidal soft bottoms in the west Pacific and Indian Oceans. In Korea, the comb pen shell Atrina pectinata fisheries has been established on the south and west coasts. Recently, a pen shell population has been discovered from a subtidal sand flat (25–30 m depth) in Ulleungdo Island located in the East Sea of Korea, suggesting a potential shellfish resource in this area. In the present study, we first surveyed the population density and size of the unique pen shell using SCUBA, and identified the pen shell to species level using mitochondrial cytochrome oxidase I gene (COI) sequence. An underwater survey carried out from July to September 2013 revealed that populations of pen shell patched on subtidal sand flat at a depth of 20–25 m. Grain size analysis indicated that sand particles accounted for 99% of the 600 × 700 m sand flat. The underwater survey also indicated that density of the pen shell ranged between 6–19 ind/m2, with a mean of 11 ind/m2. Shell height (i.e. longest axis of the shell) of the pen shell on the sand flat varied between 17.2 cm to 28.8 cm, with a mean of 25.1 cm, and the age was estimated to range between 1.5–7.5 yrs, with a mean of 5 yr. COI DNA sequence obtained from the pen shell in this study showed 98.9–99.2% similarity to Atrina pectinata (Linnaeus 1767) reported from Japan. In the cluster analysis, the COI DNA sequence of the pen shells from Ulleungdo Island was grouped with A. pectinata reported from Japan and China, indicating that the pen shell discovered in this study was A. pectinata, commonly distributed on the west and south coasts of Korea. 相似文献
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