• Animal Systematics, Evolution and Diversity
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• v.14 no.3
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• pp.193-205
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• 1998

The echinoderms collected from 20 localities of Geojedo Island and its adjacent sea waters during the period from February 1995 to May 1998 turned out to be 47 species in 37 genus, 25 familes, 11 orders, three classes. Of which one echinoid species, Prionocidaris baculosa (Lamarck, 1816) is newly added to the Korean fauna of Geojedo Island with 25 previously known species and total 47 species are described in this report.

• Proceedings of the Korean Aquaculture Society Conference
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• 2005.05a
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• pp.40-41
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• 2005

• Journal of Practical Agriculture & Fisheries Research
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• v.19 no.1
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• pp.15-23
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• 2017

Effects of artificial releases of sea cucumber around the marine ranching area in Jeollanam-do were showed very efficient by the released good seeds(total weight, 3.2g) in 'Wolhang', compared with those in 'Hwatae'. The survival rates were the higher in 'Wolhang' by 66.0% than in 'Hwatae' by 27.0%. The results indicates that the releasing effect of sea cucumber depended on the releas size. To analyze the productivity we investigated the growth and survival rates of sea cucumber according to the releasing area. Our result showed that the growth rate and survival rate was higher in 'Hwatae' than other areas. In 'Hwatae', the growth rate and survival rate were 6.2g and 32.1% respective. The results indicates that if the food supply is continued, although proceeding contamination the productivity of sea cucumber increased. Therefore, in order to enhancement and conservation of resource, bottom of fish cage should consider to the utilization.

• Journal of Fisheries and Marine Sciences Education
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• v.25 no.6
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• pp.1360-1365
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• 2013

Juvenile sea cucumber, Apostichopus japonicus(wet weight $1.0{\pm}0.2g$, n=250) acclimated to environmental conditions($17^{\circ}C$, 33 psu) during 4 weeks for observation of survival and structural variation of integumentary system according to various salinity concentration. After that, it was exposed 0, 5, 10, 15, 20, 25, 30, 35, 40 psu in 96h, and recovered during 7 days. In this results, The 96-h lethal concentration(LC50) for sea cucumber was a salinity of 21.05 psu. Integumentary system of the sea cucumber exposed to below the salinity of 20 psu mainly observed thickness reduction of epidermal layer, nucleus condensation of epithelial cells, decreased of mucous cells and loose arrangement of connective tissue in dermal layer. Integumentary system of the sea cucumber exposed a salinity of 40 psu mainly observed nucleus hypertrophy of epithelial cells, increase of mucous cells and tight arrangement of connective tissue in dermal layer. Also, observed secretory cells showing the alcian blue(pH 2.5) positive. During 96-h exposure, this cells decreased after increase below the salinity of 20 psu but increased in the salinity of 40 psu compared with 25-35 psu.

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.1
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• pp.72-80
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• 1997

To elucidate food value and medicinal effect of sea cucumbers, sugar composition of those gly-coprotein and chondroitin sulfate was studied. The contents of sulfate esters in sea cucumbers were 1.21%(blue), 0.90%(red) and 1.19%(black). Predominant carbohydrates were identified as fucose, glucose, D-mannuronic acid and N-acetylglucosamine, and those amount was more than 80% to total carbo-hydrate, while the minor sugar composition was ribose, mannose, galactose, N-acetylgalactosamine and D-glucuronic acid. Also, the major carbohydrate moiety of glycoproteins of sea cucumbers was revealed as fucose, mannose, N-acetylglucosamine, glucose and ribose, and those amount was more than 86% to total carbohydrate. Galactose, N-acetylgalactosamine, D-glucuronic acid and mannuronic acid were minor carbohydrate moiety. The contents of sulfate esters in glycoproteins were 0.96% for blue sea cucumber, 1.15% for red sea cucumber and 1.13% for black sea cucumber, while those in chondroitin sulfates were 3.52%(blue), 3.60%(red) and 3.72%(black). The carbohydrate moiety of chondroitin sulfate was identified as N-acetylgalactosamine (73~ 87%), fucose (7~15%) and D-glucuronic acid(5~12%). As the base on the IR spectrum of strong absorption appeared in 1240$cm^{-1}$ / for stretching vibrations in S=0 group and weak absorptions in 850$cm^{-1}$ / and 820$cm^{-1}$ /for stretching vibrations in C-0-S group, chondroitin sulfates had sulfate group which was bound to $C_4$in fucose.

• Journal of Aquaculture
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• v.20 no.1
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• pp.26-30
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• 2007

Resources of the sea cucumber, Stichopus japonicus in the west coast of Korea are decreasing sharply due to overfishing and severe marine pollutions. Artificial seed production and release of this species need to be conducted to maintain sea cucumber stock in the region. In this study, to provide basic information for such works, reproductive cycle of sea cucumber collected from Anmyondo in the region was histologically studied for a year from October 2004 to September 2005. This species was dioecious, and its gonads was composed of a number of gametogenic follicles. The gonadosomatic index (GSI) was reached the maximum in June (7.91), and the minimum in October (0.42). The main spawning occurs between June and August. The reproductive cycle of the sea cucumber could be divided into five stages: multiplicative stage (January to March), growing stage (March to April), mature stage (April to July), spawning.

• Journal of Life Science
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• v.32 no.9
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• pp.690-697
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• 2022

This study was conducted to analyze genome of red sea cucumber and to use it as basic data for the development of genetic markers for red sea cucumber. Microsatellite marker analysis of Ulleungdo_normal and Ulleungdo_native red sea cucumbers revealed that dinucleotide simple sequence repeats (SSRs) had the highest ratio, at 81.3~81.4%, and the number of the detected SSRs tended to decrease as the number of repeating sequence units in SSRs increased. In general, microsatellites with between 5 and 10 iterations were most common. As the size of the SSR repeating sequence units increased, the SSR iterations gradually decreased. The di-, tri-, and tetra-nucleotides in SSRs were detected in the highest numbers as (AT)₅, (AAT)₅, and (AAAT)₅, respectively. (CG) and (CCG) had very low frequencies compared to the numbers of other repeating SSR units. The numbers of di-and tri-nucleotide repeats were up to 35 and 32, respectively, and then increased discontinuously up to 44 and 43 repeats, respectively. Tetra-, penta-, and hexa-nucleotides in SSRs occurred in numbers up to 25, 21 and 14, respectively. This analysis of red sea cucumber indicated that it maintains its own repetition sequence and repetition number; therefore, we suggest that using it as basic data for molecular marker will be possible in future research.

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.417-418
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• 2006

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.57-58
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• 2006

• Proceedings of the Korean Aquaculture Society Conference
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• 2005.05a
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• pp.153-154
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• 2005