• Fisheries and Aquatic Sciences
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• v.20 no.2
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• pp.2.1-2.5
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• 2017

This is the first report of Fowlerichthys scriptissimus (Lophiiformes, Antennariidae) from Korea. A single specimen (291.0 mm SL) was collected off the coast of Jejudo Island by gill net on 28 March 2012 and identified with morphological and molecular approaches. The specimen is characterized by having all five pelvic fin rays bifurcate and possessing 20 vertebrae, 13 pectoral-fin rays, and a basidorsal ocellus on the side of the body. This species is distinguishable from other Korean taxa by the number of pectoral fin rays, the bifurcate form of the pelvic rays, and the vertebral count. We add this species to the Korean fish fauna and suggest new Korean names, "Byeol-ssin-beng-i-sok" and "Byeol-ssin-beng-i" for the genus and species, respectively.

• Animal cells and systems
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• v.12 no.4
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• pp.231-240
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• 2008

The gorgonian coral Anthoplexaura dimorpha Kukenthal, 1908(Gorgonacea: Octocorallia) is abundant in Jejudo Islands, Korea. To investigate the sexual reproduction of this species, we surveyed the morphology and cycle of gametogenesis. 5-6cm long fragments from 3-7 randomly chosen colonies were collected monthly at a depth of 12-24m in the water surrounding Munseom from August 2003 to August 2005. This species was gonochoric with sex ratio of 1.86:1(female to male), and had one annual reproductive cycle affected by elevation of seawater temperature. Oogenesis was longer than spermatogenesis as 12 months in female and 6 months in male. The planulae were not observed from the field survey and histological sections, which suggested broadcast spawning for the reproductive mode in this species. The possible spawning events may occur after the seawater temperature attain to the annual peak in September.

• Animal Systematics, Evolution and Diversity
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• v.25 no.1
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• pp.15-18
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• 2009

A new species of genus Clathria (Microciona) (Demospongiae: Poecilosclerida: Microcionidae), Clathria (Microciona) sinyangensis n. sp. was collected from Intertidal zone by hand at Seopjikoji, Sinyang, Jejudo Island, Korea on 15 Oct. 2008. C. (M.) sinyangensis n. sp. is closely related to C. (M.) pennata Lambe, 1895 in their spicules, but thick subtylostyle of new species is smaller than that of C. (M.) pennata's and has three sizes of toxa. Also, the new species has no dermal membrane.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.422-423
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• 2019

In accordance with the Carbon-Free Island by 2030 policy of Jeju Special Self-Governing Province, renewable energy sources are increasing in Jejudo Island. Due to the intermittent output characteristics of wind turbines, one of the renewable energy sources, which can cause unbalanced system conditions between the demand load and the power generation of Jejudo Island. The Korea Power Exchange limits the output of wind turbines for stabilizing the Jeju power system. Therefore, this paper proposes a method to supply a limited output of Sangmyeong Wind Farm in Jeju Power system to Energy Storage System(ESS) and Water Electrolysis Device(WED). The voltage and frequency fluctuation of the Jeju power system is checked accordingly. The simulation results are performed using the PSCAD/EMTDC program.

• Korean Journal of Plant Taxonomy
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• v.50 no.4
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• pp.419-426
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• 2020

A total of 34 taxa, 33 species and one variety, are newly added to the moss checklist of Korea. They were collected on Jejudo Island, Samcheok limestone areas in Gangwon Province, and Socheongdo Island from 2015 to 2018 and organized into 19 families and 26 genera. Additionally, eight genera are new to Korea. This study verifies the distributions of nine species whose distributions and specimens have remained unknown thus far. Finally, two unrecorded taxa, consisting of one species and one variety, are identified by reexamining Korean specimens deposited at the National Museum and Science in Japan (TNS). The specimens were collected in 1942 and 1940 from Mt. Baekdusan and Anbyun in North Korea.

• Animal Systematics, Evolution and Diversity
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• v.36 no.4
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• pp.277-284
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• 2020

Four new species of genus Scalarispongia (Demospongiae: Dictyoceratida: Thorectidae) are described from Jejudo Island, Korea. These new species of Scalarispongia are compared with 14 reported species of the genus by the skeletal structure. Scalarispongia songakensis n. sp. is similar to S. lenis in sponge shape but differs in skeletal structure and meshes are not divided into two sections. The length of secondary fibres between primary fibres of this new species is much longer than S. lenis'. Scalarispongia radicula n. sp. is resembles S. songakensis in sponge shape, but this new species has pseudo-tertiary fibres at the sponge base. Scalarispongia maraensis n. sp. is very similar to S. subjiensis in sponge shape but primary fibres of this new species are not simple because fibres have wide webbing. Scalarispongia massa n. sp. is characterized by the large mass sponge shape and numerous open oscules form a long ling on the ridge of the sponge.

• Animal Systematics, Evolution and Diversity
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• v.36 no.4
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• pp.319-329
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• 2020

The sponge-dwelling shrimp, Anchistioides compressus Paulson, 1875, is recorded from Munseom Islet, Jejudo Island, Korea for the first time. All specimens were collected inside the orange coloured sponges by trimix diving at depth from 36-45 m on the rocky reef slope. Anchistioides compressus is characterized by the shape of the rostrum, the posterolateral teeth of the sixth somite, stylocerite being well developed, the anterior margin of the scaphocerite sharply produced, and the biunguiculate dactyli of the ambulatory pereiopods, as well as the proportions of the fingers of the second pereiopods. An illustrated description of the specimens and colour photo are provided to aid future recognition.

• Animal Systematics, Evolution and Diversity
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• v.39 no.3
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• pp.127-132
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• 2023

Aquilonastra doranae, a newly recorded sea star, was collected from the southern coast of Jejudo Island by a trimix SCUBA diving survey in May 2021. The newly collected specimen is distinguished from a previously known Aquilonastra species in South Korea by having a fissiparous body form with six arms. Results of pairwise genetic distance analysis showed that the new specimen was identical or close to A. anomala from Hawaii (0.0%), Australia (3.1%), and Samoa (3.3%). However, morphological characteristics of the Korean Aquilonastra specimen corresponded with the original description of A. doranae, not that of A. anomala, including the number of inferomarginal spines, the absence of pedicellariae, and the inhabit locality. Thus, this study agrees with the original morphological study of A. doranae and presents this specimen as the first record of A. doranae in South Korea.

• Animal Systematics, Evolution and Diversity
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• v.40 no.1
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• pp.102-107
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• 2024

Two colonial ascidians, Eudistoma glaucum and Eudistoma purpureum, are reported for the first time in Korean waters through taxonomic study on ascidians collected from a subtidal zone of Jejudo Island. Eudistoma glaucum is distinguished by opaque green color of colony in living, massive colony with large corona, smooth surface of corona, sparse sand only at the peduncle, zooids in circle, about 8-10 stigmata of 3 stigmata rows and test process. Eudistoma purpureum is distinguished by brilliant, opaque, purple color of colony in living, less lobed colony form, smooth shiny surface, sparse sand only at the basal test, absence of symbionts, zooids in circle, no distinct bulging sphincter in siphon, long atrial siphon and about 20 stigmata of 3 stigmata rows. As a result of this study, four species of the genus Eudistoma are now recorded in Korean fauna.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.15 no.2
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• pp.161-170
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• 1982

A trial on the seed production of red sea-bream (Chrysophrys major) was made in Jejudo island at the southern end of Korea, from June, 1980 to August, 1981. Histological observation of the gonads indicated that the main spawning season was June to early July in Jejudo area. The newly-hatched fry were fed Brachionus sp. in the later stages Artemia nauplii, Tigriopus sp. and the minced fish flesh were given. Though during the winter season the water temperature in rearing tanks was decreased as low as $9.2^{\circ}C$, continuous feeding to the juveniles was carried out, showing body weight increase. This implies that winter rearing of juveniles in the near-shore facilities is feasible in the vicinity of Seogwipo area, in Jejudo. Feed coefficient of the juveniles (>23.2 g) was $4.16\sim4.77$ when fed the minced fish flesh.