• Title/Summary/Keyword: Dolsan Island

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First Record of the Seahorse Fish, Hippocampus trimaculatus (Pisces: Svnsnathidae) from Korea (한국산 해마속 어류 1 미기록종, Hippocampus trimaculatus Leach)

  • 김익수;이완옥
    • The Korean Journal of Zoology
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    • v.38 no.1
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    • pp.74-77
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    • 1995
  • Seahorse fish, Hippocampus trimaculatus Leach, collected in the Chriu Island and Dolsan Island, Korea is recorded for the lent time from Korea. Hippocampus trimacufctus is easily distinguishable from the other species of this genus, in having 20 dorsal fin raws, 17 anal fin rays, 11 trunk rings and 41 tail rings. H. tukokurae reported from Japan is a junior svnonsnn of H. trimacufatus.

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Seasonal distribution characteristics of fishery creatures caught in funnel net fishing ground of the Yeosu coastal sea (여수 연안 승망 어장에서 어획된 어업생물의 계절별 분포특성)

  • Joo, Chan-Soon;Park, Jin-Hyung;Park, Ju-Sam
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.42 no.3
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    • pp.158-168
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    • 2006
  • A study on the species composition and seasonal variations of fishery creatures caught by a funnel net was carried out in the coastal water off Dolsan Island, Yeosu from 2002 to 2003. During the study period, a total of 23 fishery creatures species were caught. Seabream(Acanthopagrus schlegeli), sea bass(Lateolabrax japonicus), mullet(Mugil cephalus), puffer(Takifugu niphobles) and rockfish(Sebastes inermis) predominated. These five species accounted for 85.1% of the total number of fishery creatures caught. Seasonal peaks of number of species occurred in summer, while those of number of individuals occurred in autumn. The lowest number of species and individuals were observed in winter. The large annual variation of diversity indices were observed from May to August. These large annual variation of diversity indices were mainly due to predominance of seabream, sea bass and mullet which accounted for most of all fishery creatures caught. The seasonal variations of fishery creatures showed that sea bass and mullet were caught mainly from spring to summer, seabream and puffer were caught mainly in autumn, and rockfish and brotula(Hoplobrotula armata) were caught mainly in winter.

First Record of the Monogenean Parasite of Menziesia sebastodis (Capsalidae) in Korea

  • Kim, Jeong-Ho
    • Animal Systematics, Evolution and Diversity
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    • v.25 no.1
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    • pp.129-132
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    • 2009
  • Menziesia sebastodis (Capsalidae: Monogenea) is found and described from the gill filaments and the gill rakers of the black rockfish, Sebastes inermis, caught at Dolsan Island, off the south coast of Yeosu, Jeollanam-do, Korea. The genus Menziesia is distinguished from other related genera Benedenia, Megalobenedenia and Trochopus, by septate haptors and the morphology of copulatory organs. M. sebastodis can be differentiated from other Menziesia species by the longer and slenderer posterior anchor, and the location of accessory gland reservoir. This is the first record of the genus Menziesia in Korea.

Benthic Marine Algal of Dolsan-Island in the Southern Coast of Korea II Structure of Algal Communities of Subtidal Zone (남해안 돌산도의 해조 II 조하대 해조군락의 구조)

  • SOHN Chul Hyun;LEE In Kyu;KANG Jae Won
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.16 no.4
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    • pp.379-388
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    • 1983
  • The subtidal benthic algal communities of Dolsan-island in the southern coast of Korea were surveyed by means of SCUBA diving. The vertical zonation is recognized into three groups; upper, middle and lower subtidal zones. The representative species in each group throughout the year are Ulva pertusa, Codium fragile, Chondria crassicaulis and Gigartina tenera in the upper, Myagropsis myagroides and Sargassum tortile in the middle, and Plocamium telfairiae, Callophyllis japonica and Symphyocladia linearis in the lower zone. According to the normal association analysis by $2{\times}2$ contingency table and chi-square calculation among 29 quadrats, the algal communities are divided into 9 groups which are dominated by Sargassum tortile, Myagropsis myagroides, Chondria crassicaulis, Codium fragile, Pterocladia tenuis, Gigartina tenera, Gracilaria textorii. The thallus length and standing crops of Myagropsis myagroides show the highest value in spring and the lowest in summer.

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Diel, Tidal and Seasonal Effects on the Distribution of Acartia omorii (Copepoda: Calanoida) in a Sandy-shore Surf Zone of Dolsan Island (돌산도 모래해안 쇄파대에 나타나는 요각류 Acartia omorii 분포에 미치는 주야$\cdot$조석$\cdot$계절효과)

  • PARK Eun-Ok;SUH Hae-Lip;SOH Ho Young
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.6
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    • pp.594-599
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    • 2001
  • In a sandy shore surf zone of Dolsan Island, diel, tidal and seasonal effects on abundance of Acartia omorii were investigated at three sites, the bottom and surface of 1 m depth and water's edge using a sledge-net. Of these sites, the abundance of A. omorii was the highest in the bottom. Seasonal abundance data showed that A. omorii was more abundant in winter than other seasons. During the study period, the abundance of A. omorii was always higher during ebb tide than flood, The distribution patterns of A. omorii were more influenced by tide than diel change, Strong current during spring tide possiblely affected the diel migration pattern, In winter A. omorii showed a diel vortical migration in neap tide, whereas it showed a reverse vortical diel migration in spring tide. Distribution centers were located at a layer of $50\~100\;cm$ below mean sea level (MSL) during neap tide, and then it moved slightly upward during spring tide.

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A Study on the Vegetation of the Saeng-il Island (생일도의 생물상에 관한 연구)

  • Ho Joon Lee
    • The Korean Journal of Ecology
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    • v.4 no.3_4
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    • pp.80-92
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    • 1981
  • The vegetation of Saeng-il Island was surveyed over four times from July, 1979 to May, 1981. The results obtained are summarized as follows: Plants of this island consisted of 3 foma, 28 varieties, 211 species, 203 genera, and 89 families. Evergreen broad-leaved trees consisted of 24 species, including Camellia japonica and Castanopsis cuspidata var. sieboldii. The vegetatiion of the southwest slope was more favorable than that of the northeast slope and the vegetation of other areas were negligible. Pueraria thunbergiana and Clerodendron trichotomum were predominant in the area between Yucheon-ri and Geummo-ri. Evergreen broad-leaved trees, such as Camellia Japonica, Neolitsea sencea, Castanopsis cuspidata var. sieboldii, etc. were predominated in the areas of Gulzeon-ri, Yongchul-ri and Geummo-ri. However, artificial succession to pinus thunbergii presently dominating the areas has taken place due to human interferences (for charcaol, building materials, grazing etc.). It seems to be worthy of conserving the community of Camellia japonica on the back slope of Geummo-ri and that of Castanopsis cuspidata var. sieboldii between Gulzeon-ri and Hangdo-dong. It is notceable, in particular, that Damnacanthus indicus distributed in Jeju and Dolsan islands was also discovered in this island.

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Distribution Characteristics of Eggs and Larvae of the Anchovy Engraulis japonica in the Yeosu and Tongyeong Coastal Waters of Korea (한국 남해안 여수~통영 연안해역의 멸치 난자치어 분포특성)

  • Ko, Jun-Cheoul;Seo, Young-ll;Kim, Hee-Young;Lee, Sun-Kil;Cha, Hyung-Kee;Kim, Joo-Il
    • Korean Journal of Ichthyology
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    • v.22 no.4
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    • pp.256-266
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    • 2010
  • The distribution characteristics of the eggs and larvae of anchovy Engraulis japonica, and environmental factors in the southern coastal waters of Korea were investigated from May to August 2009. Eggs and larvae were mainly distributed in the waters off Naro Island, Namhae Island and Saryang Island. High densities of eggs and larvae in temperatures of $19.0{\sim}24.0^{\circ}C$, salinites of 33.0~34.4 psu, DO of 6.05~8.13 mg/L and chlorophyll-a $1.2{\sim}2.3{\mu}g/L$ were observed. Water temperature in the coastal region was higher than that in the open sea, while salinity was lower. Evidence of sea water intrusion toward Sori Island and Maemul Island, and an inner-water intrusion from Yeoja Bay, Gamak Bay and Gwangyang Bay were observed. High densities of eggs in early developmental stage occurred in waters off Naro Island, Dolsan Island and Namhae Island, but high densities of eggs in a later developmental stage occurred in waters off Yokji Island and Maemul Island. During the survey period, the proportion of later developmental-stage eggs was higher in the eastern part of the study area.

Freshwater Fish Fauna of the Yeosu Peninsula and Geumo Islands, Korea (여수반도와 금오열도의 담수어류상)

  • Chae, Byung-Soo;Yoon, Hee-Nam
    • Korean Journal of Ichthyology
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    • v.19 no.3
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    • pp.225-235
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    • 2007
  • The freshwater fish fauna and physical characteristics of streams in Yeosu peninsula and Geumo Islands were surveyed at thirty nine stations in the period of 2003 and 2005. Most of the streams were short in length and narrow in flowing water width. Main materials of riverbed in most stations were cobble, pebble and gravel; those in the stations adjacent river mouth gravel and sand. In the river type, eighteen stations out of surveyed stations were upstream type: Aa. Thirty nine fish species belonging sixteen families were caught in this survey region. Among them twenty seven species were primary freshwater fishes and nine were peripheral. In the species composition of each family, there were the most species in Cyprinidae and Gobiidae, twelve and ten species, respectively. Endemic species of Korean peninsula in this region were eight species. One exotic fish species, Lepomis macrochirus was found in Yeosu peninsula. Dominant species in each district was Zacco temminckii in Yeosu peninsula, Rhinogobius brunneus in Dolsan Island, Leucopsarion petersii in Geumo island and Oryzias latipes in Gae island. In the analysis of community structure, it was appeared that the community of Yeosu peninsula was the most diverse and stable in this region; as the size of island became smaller, diversity and richness of community decreased. Kichulchoia brevifasciata did not caught in this survey, and it is possible that the species was extincted in this island. Acanthorhodeus gracilis and L. petersii were reported firstly in this region.

Lipids Constituents of the Korean Marine Sponges (한국산 해면의 지질 성분 연구)

  • Kim In Kyu;Park Sun Ku;Park Sung Hye;Jhang Sung Keun
    • Journal of the Korean Chemical Society
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    • v.35 no.1
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    • pp.85-89
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    • 1991
  • Various sterols and uncommon fatty acids have been isolated from the three species of Korean marine sponges. Odd-numbered pentadecanoic, heptadecanoic methyl ester and branched 12-methyltetradecanoic, 14-methylpentadecanoic, 15-methylhexadecanoic and 14-methylhexadecanoic methyl ester were isolated along with common tetradecanoic and hexadecanoic methyl ester from Heteropiidae sponge Vosmaeropsis japonica Hozawa collected from Sohuksan island of the Korea sea. Futher elution with more polar solvent gave 5${\alpha}$-cholestan-3${\beta}$-ol along with minor amount of ergost-25-ene-3${\beta}$,5${\alpha}$,6${\beta}$-triol. On the other hand, marine sponge Hymeniacidon sinapium collected from Yesu Dolsan island of the Korea sea was shown to contain 5${\alpha}$-cholestan-3${\beta}$-ol, along with minor amount of cholesterol, palmitic, palmitoleic, oleic, stearic, linolenic, and arachidonic acid ethyl ester. Unknown marin sponge collected from the same region was shown to contain large amount of tetradecanoic tetradecyl and hexadecyl ester and cholesteryl acetic and fatty acid ester.

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A Study on the Reproduction of the Sunrise Sculpin Pseudoblennius cottoides in Korea (한국산 가시망둑(Pseudoblennius cottoides)의 생식에 관한 연구)

  • Yoo, Dong Jae;Park, Jae Min;Lee, Sung Hun;Han, Kyeong Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.50 no.1
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    • pp.48-54
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    • 2017
  • The ecological characteristics of Pseudoblennius cottoides were investigated off Dolsan Island, Yeosu, Korea, from June to December, 2001. Their habitats were the reef zone and surrounding embankment which was covered with seaweeds. Their range of total length (TL) was 6.10-8.40 cm (n=15), and the individuals (over 8.10 cm) of them accounted for in June. It was 8.60-15.7 cm (n=67), and the individuals 11.1-12.0 cm in TL accounted for in October, 2001. The female to male sex ratio was 1:0.48 (n=185). The gonads were in the shape of a rod and the ovaries were large in size. In June, the histology of the seminiferous tubules was observed. In August, the testicles appeared. In October, spermatocyte was observed in the testes, and ovaries were observed in relation to circumference popularity and oocyte.