• 제목/요약/키워드: natural waters

검색결과 492건 처리시간 0.027초

한국 연근해 갈치의 자원평가 및 관리방안 연구 1. 한국 연근해 갈치의 자원생태학적 특성치 추정 (A Study on the Stock Assessment and Management Implications of the Hairtail, Trichiurus lepturus Linne in Korean Waters 1. Estimation of Population Ecological Characteristics of the Hairtail, Trichiurus lepturus Linne in Korean Waters)

  • 장창익
    • 한국수산과학회지
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    • 제29권5호
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    • pp.567-577
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    • 1996
  • 본 연구는 한국 연근해 갈치의 자원생태학적 특성치인 성장계수와 생잔율, 순간자연 및 어획사망계수, 어획개시연령 및 연령별 성장률을 추정하는 것이다. 갈치의 성장을 나타내는데는 세가지의 성장모델에 적합시켰으며, 이 중 차후의 자원평가연구를 목적으로 von Bertalanffy 성장식을 채택하였다. von Bertalanffy 성장계수는 EXCEL의 Solver를 사용하여 비선형회귀 방법에 의하여 다음과 같이 추정되었다. $L_\infty=46.01cm,\;K=0.3868,\;t_0=-0.3220$. 갈치의 연간생잔율 (S)은 0.277 (분산=0.00035)로 추정되었으며 순간자연사망 계수 (M)는 0.4411년으로 추정되었다. 근년의 순간어획사망계수 (F)는 0.843/년으로서 자연사망보다 어획에 의한 영향이 약 2배나 되고 있음을 암시하였다. 어획개시연령 $(t_c)$은 0.787세로 $50\%$ 성숙연령의다 훨씬 어린 연령이었다 마지막으로 갈치의 연령별 성장률이 추정되었다.

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First Record of Paramenophia platysoma (Copepoda: Harpacticoida: Thalestridae) from Korea, with Notes on the Morphology of the Genus

  • Kim, Jong Guk;Choi, Hyun Ki;Yoon, Seong Myeong
    • Animal Systematics, Evolution and Diversity
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    • 제33권3호
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    • pp.176-188
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    • 2017
  • Paramenophia platysoma (Thompson and Scott, 1903) is newly reported from Korean waters based on the materials collected from several seagrass and algal bed habitats. The Korean materials of P. platysoma in the present study coincide well with the original description of the species with respects to the characteristic features of the first, fourth, and fifth legs, and in most respects to P. platysoma sensu $Gam{\hat{o}}$ (1969) reported from Japan except for the antennary exopod. However, they show some differences to P. platysoma sensu Pallares (1973, 1975) reported in Argentina, in terms of the morphology of the fifth leg in females and the second leg in males. Detailed description and illustrations of P. platysoma are provided for both sexes. The morphological features of Paramenophia species are discussed and a key to the species of genus is provided.

오징어가공 슬러지를 이용한 인산염인 제거 공정에 미치는 영향인자 (Effect of Operating Variables for Phosphate Removal with Cuttlefish Processing Sludge)

  • 최봉종;이승목;김근한
    • 한국환경보건학회지
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    • 제24권3호
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    • pp.87-91
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    • 1998
  • The removal effect of phosphate by sludge from wastewaters prior to discharge into natural waters is an essential measure to prevent eutrophication in receiving waters. There is need for developing low cost, easily and abundantly available, efficient adsorbents for the removal of phosphorus (P as orthophosphate) during the tertiary treatment of wastewaters. The adsorbent carbon which is prepared with fisheries wastes on a laboratory scale has been used to evaluate its performance for phosphate adsorption. Phosphate removal increase with increasing adsorbent dose and temperature, but shows no changes at an adsorbent dose over 8 g/l.

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First record of the genus Sinamphiascus (Copepoda: Harpacticoida) from Korean waters

  • Nam, Eunjung;Lee, Wonchoel
    • Journal of Species Research
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    • 제1권1호
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    • pp.44-55
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    • 2012
  • A harpacticoid copepod, Sinamphiascus dominatus Mu & Gee, 2000 is re-described from the sandy bottom in off Jeju Island of Korea. The genus Sinamphiascus was established with single species, S. dominatus from the Bohai Sea, China. The main diagnostic characters of the specimen from Korea are well matched with the original description, although it has minor discrepancies including the lengths and ornamentation of setae in leg 6 of both sexes, shape of the base on furcal setae and teeth number of labrum in female. However those discrepancies are regarded to the intra-specific variations. This is the first record of genus Sinamphiascus in Korean waters.

Re-description of Chrysaora pacifica (Goette, 1886) (Cnidaria, Scyphozoa) from Korean Coastal Waters: Morphology and Molecular Comparisons

  • Lee, Hye Eun;Yoon, Won Duk;Chae, Jinho;Ki, Jang-Seu
    • Ocean and Polar Research
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    • 제38권4호
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    • pp.295-301
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    • 2016
  • The nomenclature of the sea nettle jellyfish from Korea was initially described as Dactylometra quinquecirrha Agassiz, 1862. However its identity has been questioned on the basis of its local distribution and molecular data. Here, we examined morphology and DNA sequences of nuclear rDNA using specimens collected from southern Korean waters in August 2014. Based on morphological characteristics (bell size, umbrella pattern, number of tentacles and lappets) and distribution locality, we reassign the Korean D. quinquecirrha to Chrysaora pacifica (Goette, 1886), and provide a re-description accordingly. The molecular identity of C. pacifica was further confirmed by comparison of nuclear ribosomal DNA sequences.

First Record of Tri-spine Horseshoe Crab, Tachypleus tridentatus (Merostomata: Xiphosurida: Limulidae) from Korean Waters

  • Yang, Kea Cheong;Ko, Hyun Sook
    • Animal Systematics, Evolution and Diversity
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    • 제31권1호
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    • pp.42-45
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    • 2015
  • A tri-spine horseshoe crab, Tachypleus tridentatus (Leach, 1819) was collected from a sandy beach of Udo Island of Jeju during the full moon tides in November 1997. Three spines on the posterior margin of the opisthosoma were characterized indicating that the specimen was T. tridentatus. This specimen was a female with the total length of 49.5 cm and prosoma width of 23.0 cm. Tachypleus tridentatus was the first record from Korean waters. A brief description and figures of the species were given. This finding indicates that Korea is included to the distribution range of the species.

거제도 다모류의 계통분학적 연구 (Systematic Study of Polychaetes (Annelida) from Offshore Waters of Geojedo Island, Korea)

  • Jong-Wui Lee
    • Animal Systematics, Evolution and Diversity
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    • 제14권3호
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    • pp.243-255
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    • 1998
  • 1995년 7월부터 1998년 1월까지 거제도 연안의 다모류를 채집하여 조사한 결과 40종이 밝혀졌다. 이중 17종은 거제도 연안에서 처음으로 기록되었고, Odontosyllis maculata Uschakov, 1950, Odontosyllis decta Augener, 1913, Autolytus(Regulatus) convolutus(Cognett, 1953)와 Chone mollis(Bush, 1904)의 4종은 한국 미기록종이었다. 한국 미기록종에 대하여는 기재하고 그림을 그려 설명하였다.

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한국미기록 원통발딱총새우와 해면원통발딱총새우(십각목 : 생이절 : 딱총새우과) 의 보고 (New Reports of Snapping Shrimps, Alpheus paralcyone and A. spongiarum (Decapoda: Caridea: Alpheidae) from Korea)

  • Hyeyoung Koo;Kim, Won
    • Animal Systematics, Evolution and Diversity
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    • 제20권1호
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    • pp.21-29
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    • 2004
  • 새우류의 지속적인 분류학적 연구 결과 딱총새우류 2 종이 한국에서는 지금까지 보고 되지 않은 종으로 밝혀졌다 . 원통발딱총새우 (Alpheus paralcyone)와 해면원통발딱총새우 (A. spongiarum)를 재기재하고 한국에서 처음 보고한다. 이 2종은 딱총새우속의 crinitus 그룹에 속하며 ,한국산 딱총새우류는 6속, 18종으로 구성된다.

한국미기록 나안딱총새우 (십각목: 생이절: 딱총새우과)의 보고 (First Record of Snapping Shrimp, Automate dolichognatha(Decapoda: Caridea: Alpheidae) in Korea)

  • Hyeyoung Koo;Kim, Won
    • Animal Systematics, Evolution and Diversity
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    • 제20권1호
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    • pp.39-44
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    • 2004
  • 새우류의 분류학적 연구 결과 딱총새우류 1종이 한국에서는 지금까지 보고되지 않은 속에 속하는 종으로 밝혀졌다 . 이 종을 나안딱총새우(Automate dolichognatha)로 신칭하고 재 기재 한다. 한국산 딱총새우류는 7속, 19종으로 구성된다.

First Record of the Monotypic Species, Nonparahalosydna pleiolepis (Polychaeta: Polynoidae) from Korean Waters, with Its DNA Barcoding Information

  • Kim, Kwang-Soo;Choi, Hyun Ki;Lee, Wonchoel;Park, Taeseo
    • Animal Systematics, Evolution and Diversity
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    • 제36권3호
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    • pp.258-263
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    • 2020
  • The aim of this study is to report monotypic species, Nonparahalosydna pleiolepis(Marenzeller, 1879) for the first time from Korean waters with its DNA barcoding data. We collected individuals of the species from the subtidal zone of southern coast of Korea through scuba diving. To estimate DNA barcoding gap, the pairwise genetic distances were calculated between N. pleiolepis and its congeners (Halosydna brevisetosa Kinberg, 1856 and Lepidonotus squamatus (Linnaeus, 1758)) based on the cytochrome c oxidase subunit I gene (COI). Inter-specific genetic distances ranged from 18.7% to 24.6%, while intra-specific genetic distance within N. pleiolepis ranged from 0.3% to 0.5%. The maximum intra-specific genetic distance among the three species was 1.4%. The morphological diagnosis of N. pleiolepis with a taxonomic note on the species were also provided.