• 제목/요약/키워드: Chum salmon

Search Result 66, Processing Time 0.312 seconds

Genetic Variation in Early Survival of Chum Salmon Families with Respect to Seawater Temperature

  • Choe Mi-Kyung;Yeo In-Kyu
    • Fisheries and Aquatic Sciences
    • /
    • 제3권2호
    • /
    • pp.88-96
    • /
    • 2000
  • The present study estimated the variation of early survival of chum salmon families with respect to temperature and size after transfer to seawater. Heritability for seawater tolerance of half-sib families was also estimated at 45 days after hatching. Gametes were collected from 6 male and 18 female chum salmon to make 18 paternal half-sib families. Seawater tests were carried out at 3, 7 and $12^{\circ}C$ of $32\%$ seawater and compared with freshwater. Survival was significantly affected by seawater temperature. The highest seawater tolerance was obtained in 45-day old chum salmon at $7^{\circ}C$ seawater and the lowest seawater tolerance was obtained at $3^{\circ}C$. Overall survivals in seawater tolerance at $32\%$ varied among families. There were significant variance in fry survival among females (P=0.0001), and among males (P=0.0001). The heritabilities of survival in seawater in chum salmon were estimated to be 0.32-0.34 for the sire components at 45 days after hatching in 1998.

  • PDF

남대천 연어(Oncorhynchus keta) 치어의 먹이 생물 (Stomach Contents of Chum Salmon (Oncorhynchus keta) Fingerlings in Namdae Stream)

  • 강수경;양현;이채성;최승호
    • 한국해양학회지:바다
    • /
    • 제12권2호
    • /
    • pp.86-93
    • /
    • 2007
  • 양양 남대천에 서식하는 연어 치어의 먹이섭식 생태조사를 위해 환경 중 수서곤충 군집과 연어(Oncorhunchus keta) 치어의 위내용물을 분석하였다. 양양 남대천에 서식하는 수서곤충은 모두 6목 25과 52종으로, 개체수에 있어서는 파리목(Diptera)이 가장 많은 전체의 91.7%를 차지하였으며, 하루살이목(Ephemeroptera)이 3.6%, 날도래목(Tripchoptera)이 3.3%, 강도래목(Plecoptera)이 1.3% 등의 순으로 나타났다. 생중량은 파리목이 전체의 40.9%, 날도래목이 40.3%, 하루살이목이 14.8%, 강도래목이 2.6% 등의 순이었다. 남대천의 수서곤충상과 연어 치어의 위내용물은 개체수나 중량에 있어 대부분 비슷하여 먹이 선택성은 거의 없이 입의 크기에 맞는 모든 살아있는 생물을 섭식하였다. 동소서식어종의 위내용물을 분석한 결과 연어 치어와 가장 유사한 위내용물을 보인 종은 산천어의 치어였다. 연어 치어와 동소적으로 서식하는 어종들의 먹이생물을 분석한 본 연구 결과는 향후 우리나라 연어 치어 방류사업에 있어 하천 수용력에 대한 기초 자료를 제공할 것이다.

Molecular Species Composition of Phosphatidylcholine Isolated from Chum Salmon Meat Oil

  • Lee, Seung-Joo;Ha, Wang-Hyun;Choi, Hye-Jin;Cho, Soon-Yeong
    • Fisheries and Aquatic Sciences
    • /
    • 제13권3호
    • /
    • pp.206-209
    • /
    • 2010
  • Chum salmon (Oncorhynchus keta) meat oil contained high amounts of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) compared to oils extracted from other tissues of the fish. EPA and DHA occupied more than 25% of the total fatty acids in chum salmon meat oil. The main lipid classes in the meat oil were triacylglycerides and phospholipids. The major fatty acids of the molecular species composition of phosphatidylcholine isolated from the meat oil were DHA and EPA. DHA and EPA were the major molecular species in the phosphatidylcholine of chum salmon meat oil, representing 44% and 17%, respectively.

Characteristics of the Protease Inhibitor Purified from Chum Salmon (Oncorhynchus keta) Eggs

  • Kim, Kenn-Yeong;Ustadi, Ustadi;Kim, Sang-Moo
    • Food Science and Biotechnology
    • /
    • 제15권1호
    • /
    • pp.28-32
    • /
    • 2006
  • Protease inhibitor of 72.6 kDa was successively purified from chum salmon (Oncorhynchus keta) eggs by ion exchange, gel permeation, and affinity chromatographies. Protease inhibitor was purified with yield and purification fold of 1.50% and 58.11, respectively. SDS-PAGE results showed purified protease inhibitor consisted of two protein subunits of 54.0 and 18.6 kDa. Chum salmon inhibitor exhibited stability between 20 and $40^{\circ}C$ in weak acid environment (PH 6), and inhibited papain and cathepsin, members of cysteine protease, but not chymotrypsin. The protein inhibited cathepsin more effectively than did egg white protease inhibitor, whereas the reverse was true for papain. These results indicate chum salmon egg inhibitor is heterodimer, thus the inhibitor was classified as cysteine protease inhibitor.

북태평양 서식 연어의 계군 분석 (Genetic stock identification of Chum salmon in the Pacific Rim)

  • 윤문근;;정희제
    • 해양환경안전학회:학술대회논문집
    • /
    • 해양환경안전학회 2017년도 공동학술발표회
    • /
    • pp.82-82
    • /
    • 2017
  • 우리나라로 회귀하는 연어는 북태평양에서 서식하는 연어 중 가장 넓은 영역에 분포하고 있으며, 경제적으로 매우 중요한 어류로서 이들의 자원관리를 위한 유전학적 연구가 활발히 진행되고 있다. 특히, 베링해와 북태평양 지역은 연어의 주 성장지로서 인접국가에서 산란된 연어들이 혼재되어 있어 국가별 연어의 계군을 구분할 수 있는 유전적 마커 개발 및 적용이 필요하고. 본 연구에서는 각 국가별 연어 집단에 대한 유전적 다양성, 차이점, 구조 및 인구통계학적 연구를 통한 유전학적 특징을 밝히고, 베링해와 북태평양 지역에서 성장하고 있는 연어의 국가별 계군의 분포와 이동 양상을 제시하려 한다.

  • PDF

연곡천 하류에서 소상하는 연어(Chum salmon, Oncorhynchus keta)의 이동특성 (Behavior Patterns during Upstream Migration of Chum Salmon (Oncorhynchus Keta) in the Lower Reaches of Yeon-gok Stream in Eastern Korea)

  • 김범식;정용우;정해근;박주면;이철호;이충일
    • 한국환경과학회지
    • /
    • 제29권9호
    • /
    • pp.885-905
    • /
    • 2020
  • This study described the characteristics of the upstream migration of salmon (Chum salmon, Oncorhynchus keta) along Yeon-gok Stream in the eastern coastal region of Korea from October 24 to November 9, 2018 using radio tag and data storage tag loggers for the detection of the locations of tagged salmon and measurement of water temperature. Tracking experiments were conducted and classified into four types (case 1 to case 4) depending on the release time and the number of salmon tracked. Experiments from case 1 to case 3 were classified depending on the number of salmon tracked into cases in which a single tagged salmon was tracked (case 1), a pair of tagged salmon was tracked (case 2), and salmon were tracked by different sex ratios (case 3). Experiments from cases 1 to 3 were conducted between 10 AM and 1 PM, and case 4 was conducted after 3:30 PM. Salmon moved and spawned in the downstream region of the Yeon-gok, where water temperature is higher than in other rivers and salmon return in Canada, Russia, Japan, and the U.S.A. Most of the radio-tagged salmon swam in deep and shaded areas during the day but actively moved upstream close to sunset, regardless of the release time. Females showed relatively more active movements than males during upstream migration.

한국의 연어생물학 연구 동향과 전망 (Present Status and Future Prospect in Salmon Research in Korea)

  • 김수암;이채성;강수경
    • 한국해양학회지:바다
    • /
    • 제12권2호
    • /
    • pp.57-60
    • /
    • 2007
  • 우리나라에서 연어(Oncorhynchus keta) 에 대한 관심은 1980년대 양양내수면연구소가 설치된 이후에 크게 증가하였다. 그 이후 연어방류사업이 점차 확대되어 최근에는 한반도의 18 개 하천에서 연어가 방류되고 있다. 하지만 아직 연어에 대한 충분한 연구 투자가 선행되지 않아, 연어에 대한 생태학적 이해는 부족한 편이다. 특히 지구환경은 지난 수십 년 동안 급격히 바뀌었고, 연어 개체군의 생물학적 특성도 변화하는 환경의 영향을 받아왔다. 연어 분포의 남방한계선에 있는 우리나라의 연어는 기후 및 해양의 변화에 민감하게 반응할 것이므로, 향후의 환경 변화를 주시해야 할 필요가 있다. 본 특별호에서는 북태평양에서 연어가 차지하는 수산생태학적 위치를 개괄하였고, 현재 우리나라에서 수행 중인 연어 연구의 결과를 요약하였다. 본 특별호가 우리나라 연어 연구의 방향을 제시하는 계기가 되기를 바란다.

The Expression of Leptin, Estrogen Receptors, and Vitellogenin mRNAs in Migrating Female Chum Salmon, Oncorhynchus keta: The Effects of Hypo-osmotic Environmental Changes

  • Choi, Young Jae;Kim, Na Na;Shin, Hyun Suk;Choi, Cheol Young
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제27권4호
    • /
    • pp.479-487
    • /
    • 2014
  • Leptin plays an important role in energy homeostasis and reproductive function in fish, especially in reproduction. Migrating fish, such as salmonoids, are affected by external environmental factors, and salinity changes are a particularly important influence on spawning migrations. The aim of this study was to test whether changes in salinity affect the expression of leptin, estrogen receptors (ERs), and vitellogenin (VTG) in chum salmon (Oncorhynchus keta). The expression and activity of leptin, the expression of ERs and VTG, and the levels of estradiol-$17{\beta}$ and cortisol increased after the fish were transferred to FW, demonstrating that changes in salinity stimulate the HPG axis in migrating female chum salmon. These findings reveal details about the role of elevated leptin levels and sex steroid hormones in stimulating sexual maturation and reproduction in response to salinity changes in chum salmon.

태평양 연어류(Oncorhynchus spp.)의 장기 풍도 변화 및 개체 크기 변화 (Long-term Variation in the Relative Abundance and Body Size of Pacific Salmon Oncorhynchus species)

  • 서현주;강수경
    • 한국수산과학회지
    • /
    • 제44권6호
    • /
    • pp.717-731
    • /
    • 2011
  • To clarify relationships between the abundance and biological characteristics of Pacific salmon Oncorhynchus spp., we analyzed spatiotemporal changes in fork length, body weight, and an index of relative abundance (catch per unit effort, CPUE) for pink salmon (O. gorbuscha), chum salmon (O. keta), and sockeye salmon (O. nerka) collected by research gill-nets from the T/V Oshoro-maru and the T/V Hokusei-maru of Hokkaido University in the North Pacific during 1953-2007. Populations of each species were distributed throughout the western Bering Sea, eastern Bering Sea (EB), western North Pacific (WNP), central North Pacific (CNP), eastern North Pacific (ENP), and Okhotsk Sea. Since 1970, the average body size of chum salmon at ocean ages 0.3-0.4 has generally declined in the WNP and CNP. However, the average body sizes of sockeye and pink salmon have not shown temporal changes. Chum salmon showed significant negative (positive) correlations between CPUE and body size for populations in CNP (ENP) at ocean ages 0.2-0.3 (age 0.1) for both sexes. In general, sockeye salmon also showed significant negative (positive) correlations between CPUE and body size for populations in the EB at ocean ages X.2-X.3 (age X.1) for both sexes, except in CNP at age 2. Our results suggest that better growth by chum and sockeye salmon in the early periods of their ocean life histories might produce higher abundance. This higher abundance, which might also be affected by overlapping distributions among Pacific salmon species and populations in certain seas, in turn appears to cause density-dependent declines in growth in the following ocean life history period due to the limited carrying capacity of the seas. To understand complex dynamics in Pacific salmon species in the North Pacific Ocean, research on interactions among species and populations is needed.

방류 연어, Oncorhynchus keta 치어의 해양 먹이선택성 (Marine Prey Selectivity of Released Juvenile Chum Salmon (Oncorhynchus keta) During arly Marine Migration in Korean Waters)

  • 권오남;김주경;윤문근;김두호;홍관의
    • 수산해양교육연구
    • /
    • 제26권2호
    • /
    • pp.421-429
    • /
    • 2014
  • We investigated the feeding ecology of juvenile chum salmon (Oncorhynchus keta) during the critical early life stage prey selectivity of juvenile chum salmon during early marine migration in Korean waters at spring 2011. Salmon juveniles and zooplanktons were collected to draw with $20m{\times}5m$ gill net and $300{\mu}m$ mesh zooplankton net at each station on 11th-13th April n 2011. Collected zooplanktons were classified to 5 Phylum, 6 Class, 9 Order 17 Species in this study. Almost 76.4-100% species were classified to Phylum Arthropoda, dominant species was a species out of Hyperia galba of Order Amphipoda, Acartia spp and Paracalanus parvus of Order Calanoida. Collected salmon juveniles were grew up to average 4.7-5.4 cm fork length and average 1.0-1.5 g wet weight in whole station. Fish stomach content (mg/salmon) was heaver to 97.4, 82.4 and 63.2 mg wet weight/salmon in ST 2, 3, 4 than 20.4, 18.9 mg/salmon of ST 1, 5, because there are fish (sand eel, Hypoptychus dybowskii) and Krill (Euphausia) as prey in salmon stomach in ST 2, 3, 4. And ST 2, 3, 4 and 5 were dominated by Amphipoda as Hyperia galba, Themisto japonica and Gammarus sp., but ST 1 was dominated by copepod, because of absence of Amphipoda in the station. Therefore small Amphipoda as Hyperia galba was good prey for just released salmon juvenile in nature.