Egg Development and Morphological Change of Larvae and Juveniles of the Starry Flounder, Platichthys stellatus

강도다리, Platichthys stellatus의 난발생과 자치어의 형태발달

  • 변순규 (국립수산과학원 동해특성화연구센터) ;
  • 이배익 (국립수산과학원 동해특성화연구센터) ;
  • 이종하 (동해수산연구소) ;
  • 구학동 (국립수산과학원 종보존연구센터) ;
  • 박상언 (국립수산과학원 바다목장화사업단) ;
  • 윤성민 (경상북도수산자원개발연구소) ;
  • 황선영 (군산지방해양수산청) ;
  • 김이청 (국립수산과학원 동해특성화연구센터) ;
  • 한형균 (국립수산과학원 중부내수면연구소)
  • Received : 2007.09.24
  • Accepted : 2007.11.02
  • Published : 2007.12.31

Abstract

The egg development and morphological change of larvae and juveniles of the starry flounder, Platichthys stellatus were observed in laboratory. Fertilized eggs of the species, 1.09~1.19 mm (mean $1.13{\pm}0.03mm$, n=50) in diameter, were floating, colorless, transparent in shape and lacked in oil globules. The eggs hatched out 121 hours after fertilization at water temperature $8.2{\sim}11.2^{\circ}C$. The size of the hatched larvae were 2.58~2.89 mm (mean $2.67{\pm}0.09mm$) in total length, their mouth and anus were not open yet and myotome number was 14+27=41. Melanophore and xanthophore appeared on the notochord and digestive organ and the margin of membrane fin, on the yolk sac and eyes were lacking in pigment cells. 5 days after hatching the larvae attained 4.30~4.97 mm (mean$4.74{\pm}0.21mm$) in TL, and their mouth and anus were open. 10 days after hatching the larvae transformed to postlarval stage and they were 4.67~5.75 mm in TL (mean $5.30{\pm}0.31mm$), and absorbing the yolk completely. Feeding activity increased as the mouth became larger. At 23 days, the larvae attained 6.69~8.82 mm in TL (mean $7.85{\pm}0.75mm$), and the right eye was started moving to the left side of the head. At 52 days, the juveniles attained 10.99~17.06 mm in TL (mean $13.50{\pm}1.67mm$). The right eye was moved completely onto the left side. All of the fins had completed set of the fin rays (D. 64~67: A. 45~51: P. 11: V. 6: C. 19).

강도다리, Platichthys stellatus의 난발생과정과 자치어의 형태발달에 관하여 관찰하였다. 수정란은 무색투명한 분리부성란이며, 유구는 없고, 난경은 1.09~1.19 mm (평균 $1.13{\pm}0.03mm$, n=50)였다. 사육 수온 $8.2{\sim}11.2^{\circ}C$에서 수정 후 121시간 만에 부화를 시작하였다. 부화 직 후의 자어는 전장 2.58~2.89 mm (평균 $2.67{\pm}0.09mm$)로 입과 항문은 열려 있지 않으며, 척색은 직선형이고, 근절은 14+27=41개이다. 척색과 소화관 위에는 흑갈색소포와 황갈색소포가 산재해 있고, 막지느러미 가장자리와 눈 및 난황 위에는 색소포가 없다. 부화 후 5일째에는 전장 4.30~4.97 mm (평균 $4.74{\pm}0.21mm$)로 입과 항문이 열려 있으며, 부화 후 10일째 자어는 전장 4.67~5.75 mm (평균 $5.30{\pm}0.31mm$)로 난황이 완전히 흡수되어 후기자어기로 이행하며, 로티퍼의 섭식이 활발해진다. 부화 후 23일째에는 전장 6.69~8.82 mm (평균 $7.85{\pm}0.75mm$)로 오른쪽 눈이 왼쪽으로 이동하기 시작한다. 부화 후 52일째 개체는 전장 10.99~17.06 mm (평균 $13.50{\pm}1.67mm$)로 눈은 머리부분의 왼쪽으로 완전히 이동하여 있으며, D. 64~67: A. 43~46: P. 11: V. 6: C. 19개로 각 지느러미 줄기가 정수에 달하여 치어기로 이행하였다.

Keywords

Acknowledgement

Supported by : 국립수산과학원

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