한국어류학회지 (Korean Journal of Ichthyology)

  • 제36권3호
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  • Pages.220-229
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  • 2024
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
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보통천에 서식하는 갈문망둑 Rhinogobius giurinus의 난발생 및 자치어 형태발달

Morphological of Development Eggs, Larvae and Juveniles Rhinogobius giurinus in Botongcheon Stream

  • 박재민 (경상북도 내수면관상어비즈니스센터) ;
  • 한경호 (전남대학교 수산과학과)
  • Jae-Min Park (Gyeongsangbuk-Do Freshwater Aquarium Fishes Business Center) ;
  • Kyeong Ho-Han (Fishery Science Chonnam National University)
  • 투고 : 2024.07.16
  • 심사 : 2024.08.29
  • 발행 : 2024.08.31
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초록

본 연구는 보통천에 서식하는 갈문망둑의 초기생활사를 규명하고 근연종과 차이점을 비교하였다. 난의 크기(장경×단경)는 평균 3.46×1.17 mm (n=30)였다. 수온 22.5±1℃에서 부화에 소요되는 시간은 213시간 30분이었다. 부화 직후 난황자어는 전장 2.34±0.05 mm (n=30)로 입과 항문이 열리지 않았고 근절 수는 23~25개였다. 부화 후 3일째 전기자어는 2.70±0.09 mm (n=30)로 입과 항문이 열리면서 먹이 섭취가 시작되었다. 부화 후 22일째 중기자어는 5.26±0.16 mm (n=30)로 척추 말단 끝부분이 위쪽으로 휘어져 중기자어로 이행하였다. 부화 후 48일째 후기자어는 11.1±0.53 mm (n=30)로 척추 말단 끝부분이 위쪽 45°로 완전히 휘어져 후기자어로 이행하였다. 부화 후 60일째 치어는 14.9±0.69 mm (n=30)로 각 지느러미별 기조 수는 제1등지느러미 6개, 제2등지느러미 8~10개, 뒷지느러미 9개, 꼬리지느러미 15개, 배지느러미 5개로 모든 지느러미가 정수가 되어서 치어기로 이행하였다. 연구 결과 후기자어 시기에 흑색소포는 아가미 뚜껑 위쪽, 등 쪽과 몸통에 침착한 점, 황색소포는 머리와 몸통에 침착한 점에서 다른 망둑어과 어류의 후기자어들과 차이를 보였다.

This study investigated the early life history of Rhinogobius giurinus in the Botongcheon stream and compared the differences with related species. The fertilized egg size (long×short) of the 3.46×1.17 mm (n=30) on average. The time required for hatching at the water temperature of 22.5±1℃ was 213 hours and 30 mins. Immediately after hatching, the egg yolk had an average total length of 2.34±0.05 mm (n=30), and the mouth and anus were not opened, and the number of myotomes was 23~25. 3 days after hatching (DAH), the preflexion larvae had an average total length of 2.70±0.09 mm (n=30), and live food intake began as the mouth and anus were opened. 22 DAH, the flexion larvae had an average total length of 5.26±0.16 mm (n=30), and the tip of the vertebrae began to bend upward. 48 DAH, the postflexion larvae had an average total length of 11.1±0.53 mm (n=30), and the tip of the vertebrae was completely bent 45° upward. 60 DAH the juveniles had an average total length of 14.9±0.69 mm (n=30) was reached to the integer with 6 first dorsal fins, 8~10 second dorsal fins, 9 anal fins, 15 caudal fins, and 5 ventral fins for each fin. As a result of the study, the melanophore differed from other postflexion larvae of the Gobiidae fishes in that it was deposited above the gill lid, on the back and body, and the xanthophore was deposited on the head and body.

키워드

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