Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Comparative Morphology of Tanakius kitaharae and Glyptocephalus stelleri (Pleuronectidae) Larvae

갈가자미, Tanakius kitaharae와 기름가자미, Glyptocephalus stelleri (가자미과) 자어의 형태 비교

  • Jang, Seo-Ha (Department of Marine Biology, Pukyong National University) ;
  • Jung, Kyung-mi (Dokdo Fisheries Research Center, National Institute of Fisheries Science) ;
  • Park, Jeong-Ho (Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • Kim, Jin-Koo (Department of Marine Biology, Pukyong National University)
  • 장서하 (부경대학교 자원생물학과) ;
  • 정경미 (국립수산과학원 독도수산연구센터) ;
  • 박정호 (국립수산과학원 연근해자원과) ;
  • 김진구 (부경대학교 자원생물학과)
  • Received : 2016.08.31
  • Accepted : 2016.09.26
  • Published : 2016.09.30
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Abstract

Tanakius kitaharae and Glyptocephalus stelleri, belonging to the family Pleuronectidae, were very similar in external morphology not only during adult periods, but also during larval periods. In this study, we compared larval development and growth of the two pleuronectids species in detail. Fifty-eight specimens of T. kitaharae larvae and five specimens of G. stelleri larvae were collected from the East Sea, southern Korean Strait, and the adjacent waters of Jeju Island during 2014~2016, and were identified using morphological and molecular markers. Flexion larvae of T. kitaharae (10.23~16.77 mm total length, TL) and G. stelleri (14.33 mm TL) were similar in morphometrics, but can be distinguished by the melanophores in the fin membranes (present in the former vs. absent in the latter), and the melanophores at posterior margin of shoulder girdle (absent in the former vs. present in the latter). Postflexion larvae of T. kitaharae (17.12~24.92 mm TL) and G. stelleri (27.71~32.95 mm TL) differed in the number of melanophores on the mid-lateral caudal region (two in the former vs. five in the latter), and that on the dorsal and anal fin pterygiophores (five or six in the former vs. one row in the latter). Tanakius kitaharae and G. stelleri larvae differed in size at the beginning of metamorphosis. The left eye of T. kitaharae larvae between 23.13~24.92 mm TL reached the dorsal margin of the head while that of G. stelleri larvae between 38.66~42.67 mm TL did not reached yet.

가자미과 (Pleuronectidae)에 속하는 갈가자미 (Tanakius Kitaharae)와 기름가자미 (Glyptocephalus stelleri)는 성어기 뿐만 아니라 초기생활기에도 외형적으로 매우 유사하여 오동정의 가능성이 높다. 따라서, 본 연구는 두 종의 자어 시기의 형태발달과정을 상세히 비교하여 종 동정의 기초자료를 제공하고자 한다. 2014~2016년 동안 동해, 남해 및 제주 근해에서 채집된 갈가자미 자어 58개체 및 기름가자미 자어 5개체를 대상으로 분자동정 및 형태 비교를 수행하였다. 갈가자미의 중기자어 (10.23~16.77 mm total length, TL)와 기름가자미의 중기자어 (14.33 mm TL)는 계측값에서 중복되나 지느러미 가장자리 흑색소포의 유무 (갈가자미는 있음 vs. 기름가자미는 없음)와 견대 뒤쪽 흑색소포열의 유무 (갈가자미는 없음 vs. 기름가자미는 있음)에서 구분되었다. 갈가자미의 후기자어 (17.12~24.92 mm TL)와 기름가자미의 후기자어 (27.71~42.67 mm TL)는 계측값에서 잘 구분되었으며, 나아가 꼬리 측면 중앙부 흑색소포군의 개수 (갈가자미는 2개 vs. 기름가자미는 5개), 등지느러미와 뒷지느러미 담기골의 흑색 소포 형태 (갈가자미는 5~6개의 흑색소포군이 등간격으로 분포 vs. 기름가자미는 담기골 기부를 따라 점모양 흑색소포가 불규칙하게 분포)에서 차이를 보였다. 갈가자미 자어는 전장 23.13~24.92 mm에서 왼쪽 눈이 머리의 등쪽 정중선에 도달하는 반면 기름가자미 자어는 전장 38.66~42.67 mm에서 왼쪽 눈이 머리의 등쪽 정중선에 도달하지 못하여 변태시기에서 차이를 보였다.

Keywords

References

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