한국어류학회지 (Korean Journal of Ichthyology)

  • 제20권3호
  • /
  • Pages.173-178
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  • 2008
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
권호 표지

Oyster reef에서 black sea bass, Centropristis striata 치어의 행동

Behavior of Juvenile Black Sea Bass, Centropristis striata (Linnaeus) on Oyster Reefs

  • 곽우석 (경상대학교 해양산업연구소, 해양생명과학과)
  • Gwak, Woo-Seok (Department of Marine Biology and Aquaculture, The Institute of Marine Industry, College of Marine Science, Gyeongsang National University)
  • 투고 : 2008.08.11
  • 심사 : 2008.09.17
  • 발행 : 2008.09.30
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초록

black sea bass 치어(이하 치어라 칭함)의 기질 선택성을 수조 내부의 바닥을 굴 껍질 관련 기질과 모래 기질을 덮어 이등분 한 원형수조(1.5 m 직경${\times}$0.4 m 깊이)에서 조사하였다. 실험어는 1개체를 수조에 넣는 단독수용과 5개체를 넣는 그룹으로 하였다. 모든 치어의 기질 선택행동 실험은 20분간 비디오에 녹화하여 모니터 상에서 관찰하였고 수조 내에서 치어의 위치와 각 기질에서 체류한 시간을 기록하였다. 굴 껍질 관련 기질에서 치어가 보낸 평균시간은 1개체 수용구에서 $18.1{\pm}2.0$분과 5개체 수용구에서 $17.5{\pm}1.7$분으로 나타났다. 한편, 모래기질 위에서는 1개체 수용구에서 $2.0{\pm}1.0$분과 5개체 수용구에서 $2.5{\pm}1.7$분으로 나타났다. 1개체와 5개체의 치어로 수행한 실험 모두에서 모래 기질보다는 굴 껍질 관련 기질에 대해 유의한 선택성을 나타냈다(paired t-test, P<0.05). 굴 껍질 관련 기질 아래 체제시간은 1개체 수용구에서 $16.6{\pm}2.0$분과 5개체 수용구에서 $10.7{\pm}2.3$분으로 나타났다. 굴 껍질 관련 기질 사이를 이동한 횟수는 1개체 수용구에서 $1.1{\pm}1.0$회와 5개체 수용구에서 $11.5{\pm}3.1$회로 나타났다. 치어는 1개체 수용구보다는 5개체 수용구에서 굴 껍질 관련 기질 아래 머무는 시간이 유의하게 적고, 또한 움직임이 많은 것으로 나타났다(paired t-test, P<0.05). 은신처 확보를 위한 치열한 경쟁으로 인해 5개체 수용구의 치어가 굴 껍질 관련 기질 아래 머무는 시간이 적고 움직임이 많은 것으로 추측된다.

The substrate preferences of juvenile black sea bass Centropristis striata (Linnaeus) was tested in a circular tank (1.5 m diameter${\times}$0.4 m deep) divided into two equal areas of oyster-related (oyster reef and whole oyster shell) and sand substrates. All trials were video taped for 20 min. Tapes were viewed on a monitor and locations of all fish recorded and timed with respect to substrate. $Mean{\pm}SE$ times on oyster shell were $18.1{\pm}2.0min$ (1-fish trial-1) and $17.5{\pm}1.7min$ (5-fish trial-1). $Mean{\pm}SE$ times on sand were $2.0{\pm}1.0min$ (1-fish trial-1) and $2.5{\pm}1.7min$ (5-fish trial-1). Black sea bass juveniles showed a significant preference for oyster reef and shell over sand substrate in single-fish trials (paired t-test, P<0.05) and also in five-fish trials (paired t-test, P<0.05). $Mean{\pm}SE$ times under oyster reefs were $16.6{\pm}2.0min$ in single-fish trials and $10.7{\pm}2.3min$ in five-fish trials. Mean numbers of movements among oyster reefs were $1.1{\pm}1.0$ in single-fish trials and $11.5{\pm}3.1$ in fivefish trials. Fish spent significantly less time under oyster reefs in five-fish trials, compared to single-fish trials (paired t-test, P<0.05) and they moved more frequently in five-fish trials than in single-fish trials (paired t-test, P<0.05). Significantly higher competition for a refuge in five-fish trials may induce less time under oyster reefs as well as frequent movement of black sea bass juveniles on shell substrate.

키워드

과제정보

연구 과제 주관 기관 : University of Georgia Marine Institute, University of Georgia Marine Extension Service

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