• Title/Summary/Keyword: 연어

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Morphological study of Oncorhynchus spp.(Pisces : Salmonidae) in Korea- II Osteological development of chum salmon, Oncorhynchus keta in alevin, fry and smolt stage (한국산 연어속 어류의 형태학적 연구- II 초기 발육단계에 있어서의 연어, Oncorhynchus kita 의 골격 발달)

  • Myoung, Jung-Goo;Kim, Yong-Uk
    • Korean Journal of Ichthyology
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    • v.5 no.1
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    • pp.68-84
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    • 1993
  • Matured adults of chum salmon were collected from Namdae-chun River, Yangyand-gun, Kangwon-do, Korea in december of 1989 and 1990. Artificial insemination was made in the field. Hatching and neasing were cassied out in laboratories of the Yangyand Fisheries Institute and Korea Ocean Research and Development Institute : Ossification of bones of alevin, fry and smolt were investigated : 1. The newly hatched alevins, 1.80 to 2.56mm in total length, were ossified partly on parasphenoid, maxillary, dentary and opercle bones. 2. The alevin stage, the visceral bones connected with feeding and respiratory function were ossified earlier than cranium and vertebra. At swim up stage, the fry attained 3 to 4cm in total length, most of bones except cranium were ossified. 3. Teeth on the jaw bones, palatine, vomer, upper and lower pharyngeal bones were increased conspicuously when the body length were ranged from 3 to 4cm. 4. Caudal fin of hatched larvae had already seventeen occified rays and developed earlier than any other fins.

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An Experimental Study on an Effective Word Sense Disambiguation Model Based on Automatic Sense Tagging Using Dictionary Information (사전 정보를 이용한 단어 중의성 해소 모형에 관한 실험적 연구)

  • Lee, Yong-Gu;Chung, Young-Mee
    • Journal of the Korean Society for information Management
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    • v.24 no.1 s.63
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    • pp.321-342
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    • 2007
  • This study presents an effective word sense disambiguation model that does not require manual sense tagging Process by automatically tagging the right sense using a machine-readable and the collocation co-occurrence-based methods. The dictionary information-based method that applied multiple feature selection showed the tagging accuracy of 70.06%, and the collocation co-occurrence-based method 56.33%. The sense classifier using the dictionary information-based tagging method showed the classification accuracy of 68.11%, and that using the collocation co-occurrence-based tagging method 62.09% The combined 1a99ing method applying data fusion technique achieved a greater performance of 76.09% resulting in the classification accuracy of 76.16%.

Stress responses of coho salmon, Oncorhpchus kisutch, to transport in fresh water or salt water (담수 및 염수 수송이 은연어의 스트레스 반응에 미치는 영향)

  • JEON Joong-Kyun;KIM Pyong-Kih;PARK Yong-Joo;MYOUNG Jung-Goo;KIM Jong-Man
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.33 no.2
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    • pp.119-123
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    • 2000
  • To study the stress response of coho salmon (Oncorhpohus kisutch) during transportation, the stress responses of the fish confined in a container box filled with freshwater or $5{\%{\circ}}$ salt-water were monitored pre and post 10 hours transportation. Changes of cortisol as the first stress indicator, and glucose (GLC), lactate (LAC), triglyceride (TG), cholesterol (CHOL), sodium ($Na^+$), chloride ($Cl^-$), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) as the second stress indicators were compared between the fish in two hauling media. Results showed significantly lower levels of cortisol, GLC, LAC, TG, CHOL and AST in salt-water group than freshwater group, It was shown that using salt-water for transportation could lessen the stress level of the coho salmon.

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Changes of Salmon Meat Texture During Semi-Drying Process (조미 반건조 제품 가공 공정에 따른 연어육 Texture의 변화)

  • You Byeong-Jin
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.2
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    • pp.264-270
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    • 1997
  • To obtain basic data for processing semi-dried salmon meat product, the results that were measured the textural properties of salmon meat during salting, sugaring and drying process followed. Drying time and temperature were longer, the moisture amount of salmon meat were reduced. Hardness of salmon meat was direct proportion to shear stress, but hardness was inverse proportion to cohesiveness during drying process. After sugaring and salting salmon meat, drying time was longer, hardness and shear stress of salmon meat were increased. The sensory evaluation of the textures of sugaring salmon meat dried for 3 hrs showed slightly good. In the changes of texture of salmon meat during steaming hardness and shear stress of salmon meat dried for 4 hrs were higher than that dried for 10 hrs. And steaming time was longer, hardness of salmon meat dried for 4 hrs was decreased and cohesiveness was not changed.

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Distribution of N-Methyl-D-Aspartate Receptor Subunits NR2A and NR2B in Chum salmon Brain (연어 뇌에서 N-Methyl-D-Aspartate 수용체 아단위 NR2A와 NR2B의 분포)

  • 진덕희;문일수
    • Journal of Life Science
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    • v.9 no.6
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    • pp.722-727
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    • 1999
  • We carried out immunoblot analyses to study expression and subcellular distribution of the N-methyl-D-aspartate receptor(NR) subunits in salmon (Chum Salmon, Oncorhynchus keta). We prepared subcellular fractions such as brain homogenates, synaptosomes, and postsynaptic density (PSD) from salmon brains, and analyzed protein compositions by SDS-polyacrylamide gel electrophoresis (SDS-PAGE). In a Coomassie-stained 6% SDS-gel, about 20 distinct major protein bands could be identified in the PSD fraction. Immunoblot analyses using antibodies against rat NR subunit 2A and 2B antigens (NR2A and NR2B, respectively) showed weak but evident signals at the 180 kDa positions in the salmon PSD fractions. However, in contrast to rat NRs, the salmon NR2A and NR2B are not recognized by a phosphotyrosine-specific antibody suggesting that the salmon NRs are regulated differently from those of the rat by protein tyrosine kinases. Our results indicate that NR2A and NR2B subunits are expressed in the salmon PSD fraction but not regulated by tyrosine phosphorylation.

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