Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Morphological of Development Eggs, Larvae and Juveniles Micropercops swinhonis in Botongcheon Stream Hangang River

한강 수계 보통천에 서식하는 좀구굴치 Micropercops swinhonis의 난발생 및 자치어 형태발달

  • 박재민 (경상북도 토속어류산업화센터) ;
  • 한경호 (전남대학교 수산과학과)
  • Received : 2023.07.18
  • Accepted : 2023.08.10
  • Published : 2023.08.31
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Abstract

This study investigated the early life history of the Micropercops swinhonis in Botongcheon stream Hangang River and compared the relationship between the related species and flexibility. The fertilized egg of the ovoid type, and the average egg diameter was 1.23 mm in long diameter and 0.85 mm in short diameter. At a water temperature of 20.6℃, the hatching time took 179 hours. The newly hatched larvae measured 3.82~4.08 mm in total length (TL), and their mouth and anus were not yet open. At 18 days after hatching, the postflexion larvae reached 7.97~8.43 mm in TL, with the tip of the caudal fin bent at 45°. At 29 days after hatching, the juveniles reached 9.83~10.8 mm in TL and were differentiated by their constant number of fins (7~10 first dorsal, 10~11 second dorsal, 7~10 anal fins). As a result of the study, there was a difference from the related species in the egg diameter, the newly hatched larva size. The postflexion larvae period and the development period of the first dorsal fin were the slowest among the comparable simila species, and the size was characterized by a large number, indicating a difference from similar species in the early life history process.

이 연구는 한강 수계 보통천에 서식하는 좀구굴치의 초기생활사를 규명하고 근연종과 유연관계를 비교하였다. 좀구굴치의 수정란은 타원형으로 평균 난경은 장경 1.23 mm, 단경 0.85 mm 였다. 수온 20.6℃에서 부화 시간은 179시간이 소요되었다. 부화자어의 크기는 전장 3.82~4.08 mm로 입과 항문이 완전히 발달하지 않았다. 후기자어기는 부화 후 18일째 전장 7.97~8.43 mm로 척색말단 끝부분이 45°로 완전히 휘어졌다. 치어기는 부화 후 29일째 전장 9.83~10.8 mm로 지느러미 줄기 수는 정수에 달하였다. 연구 결과 좀구굴치는 난 크기, 부화자어 크기, 유영형태에서 근연종과 차이를 보였다. 후기자어 이행시기와 제1등지느러미 발달 시기는 비교한 근연종 중 가장 느렸고, 크기는 큰 특징을 보여 초기생활사에서 근연종과의 차이점을 확인할 수 있었다.

Keywords

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