한국어류학회지 (Korean Journal of Ichthyology)

  • 제28권3호
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  • Pages.192-199
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  • 2016
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
권호 표지

한강하구에서 조석주기에 따른 웅어속 자치어의 출현량 변동

Change in Abundance of Coilia spp. Larvae by the Tidal Cycle in the Han River Estuary, Korea

  • 투고 : 2016.05.23
  • 심사 : 2016.09.20
  • 발행 : 2016.09.30
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⟨ 이전 논문 다음 논문 ⟩

초록

조류에 의한 에너지가 상대적으로 매우 큰 한강 하구역의 대표적인 석모수로와 염하수로에서 2007년 8월과 2008년 8월에 연속 관측을 통해 조석주기에 따른 소하성 어종인 웅어속 자치어의 출현량을 조사하였다. 조석주기에 따른 환경측정 결과, $1^{\circ}C$ 미만의 수온차를 보였고, 염분은 창조 시 최고 15.1 psu, 낙조 시 최저 0.8 psu로 조석에 따른 염분차가 컸다. 웅어속 자치어는 창조 시보다 낙조 시 높은 출현량을 보였다 (p<0.05). 이는 소하성 어종인 웅어속 자치어가 한강 상류 또는 중류에서 부화한 후, 보육장인 하구역에 정착하기 위해 수평이동 선택적 조수흐름 (STST)으로 낙조류를 이용하는 것으로 사료되며, 특히 낙조 시 13.6 mm 이상의 유영력이 향상된 개체일수록 뚜렷하게 나타났다.

The Seokmo and Yeomha channels are representative areas of high tidal energy in the Han River estuary. Surveys of environmental variables and abundance of Coilia spp. larvae, an anadromous fish, were carried out following the tidal cycle in August 2007 and August 2008. It was found that mean water temperature varied by <$1^{\circ}C$ across flood and ebb tides. A clear difference in salinity was observed between tides, with a high of 15.1 psu during flood tide, and a low of 0.8 psu during ebb tide. Coilia spp. larvae were significantly more abundant during the ebb tide than the flood tide (p<0.05). Since Coilia spp. larvae are anadromous fish, it seems that they use the ebb tide as a Selective tidal stream transport (STST) for horizontal movement in order to settle in the estuary (cultivation area), following hatching in the upper/middle courses of the Han River. A high percentage of larvae with improved swimming ability (measuring ${\geq}13.6mm$ in length) was observed during the ebb tide.

키워드

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