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Morphological Development of Egg and Larvae of Gnathopogon strigatus (Gobioninae)

줄몰개(Gnathopogon strigatus)의 난 발생 및 자치어 형태 발달

  • Kim, Kyeong-Mu (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Jeon, Hyoung-Joo (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Song, Ha-Yun (Inland Fisheries Research Institute, National Institute of Fisheries Science)
  • 김경무 (국립수산과학원 중앙내수면연구소) ;
  • 전형주 (국립수산과학원 중앙내수면연구소) ;
  • 송하윤 (국립수산과학원 중앙내수면연구소)
  • Received : 2019.08.27
  • Accepted : 2019.09.25
  • Published : 2019.09.30

Abstract

This study is to observe species identification and early life history of Gnathopogon strigatus and to use it as a basis for taxonomic studies and conservation of species. For the experiments, the mature adults were collected at the Wang-suk Stream located in Namyang-ju city, Gyeong-gi Province and eggs were artificially fertilized by the wet method in the laboratory. The shape of the fertilized egg was globular, adhesive, opaque white in color and had no oil globules. The fertilized egg was 1.66~1.88 mm (average 1.76 mm, n=30) in diameter. The blastular stage occurred at 3 hours 05 minutes after fertilization and the gastrular stage was detected at 8 hours 30 minutes after fertilization. The embryo began to hatch about 54 hrs after fertilization under water temperature of $23{\pm}1^{\circ}C$ and the newly hatched larva (yolksac larva) were 4.1~4.7 mm (mean 4.4 mm, n=20) in total length (TL). The fourth day after hatching, the postlarva were 5.4~5.9 mm (mean 5.6 mm, n=20) in total length, their york sacs were completely absorbed and Start eating Artemia sp. Ten days after hatching, flexion larva were begins Notochord flexion were 7.5~8.6 mm (mean 8.1 mm, n=20) in total length. Sixteenth day after hatching, postflexion larva were complete Notochord flexion were 8.2~9.7 mm (mean 9.1 mm, n=20) in total length. At thirty-eight days after hatching, Juvenile were arrive integer all fin rays and similar to those of adults were 11.3~15.5 mm (mean 13.3 mm, n=20) in total length.

본 연구는 난과 자치어의 형태 및 생활사가 밝혀지지 않은 G. strigatus의 초기생활사에 대하여 연구하였다. G. strigatus의 친어는 경기도 남양주시의 왕숙천에서 확보하였다. 성숙된 암컷 친어에 HCG (human chorionic gonadotropin)를 10 IU/g의 농도로 주사하여 성숙란을 얻었으며, 습식법으로 인공 수정하였다. 수정란은 불투명한 흰색 원형의 침성점착란으로 직경은 1.66~1.88 mm이었다. 수정란은 수온 $23{\pm}1^{\circ}C$에서 수정 54시간 후 부화가 완료되었으며, 부화자어의 전장은 4.1~4.7 mm로 무색투명하였다. 부화 4일 후 자어는 5.4~5.9 mm로 입과 항문이 열리고 알테미아를 섭식하여 전기자어기로 이행하였다. 부화 10일 후 자어는 7.5~8.6 mm로 척삭말단이 굴곡되고 꼬리지느러미의 기조가 형성되어 중기자어기로 이행하였다. 부화 16일 후 자어는 8.2~9.7 mm로 척색말단의 굴곡이 완료되었고 부레가 두 개로 분할되어 후기자어기로 이행하였다. 부화 38일 후 모든 지느러미의 기조가 정수에 도달하여 치어단계로 이행하였다.

Keywords

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