Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Morphological Development of Eggs, Larvae and Juveniles of Trident Goby, Tridentiger brevispinis (Pisces: Gobiidae)

민물검정망둑 Tridentiger brevispinis의 난발생 및 자치어 형태발달

  • 박재민 (경상북도 토속어류산업화센터) ;
  • 한경호 (전남대학교 수산과학과)
  • Received : 2023.01.02
  • Accepted : 2023.02.20
  • Published : 2023.02.28
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Abstract

This study aimed to examine the early life history of Trident goby (Tridentiger brevispinis) by observing their egg development and juvenile fish morphology. The average size of mature eggs was 1.13~1.41 (1.30±0.07) mm (n=30), and 0.70~0.86 (0.79±0.04) mm (n=30) in long diameter and short diameter, respectively. The incubation period at 24±1℃ ranged from 167~228 h. The newly hatched larvae measured 2.31~2.78 (2.51±0.18) mm (n=30) in total length (TL), and their mouth and anus were not yet open. At 3 days after hatching, the preflexion larvae reached 2.84~3.10 (2.98±0.10) mm in TL, where in their yolk absorption was complete and their mouths began to open. At 19 days after hatching, the larvae reached the flexion stage, measuring 4.02~4.62 (4.36±0.19) mm in TL. The tip of their notochord was bent upward. At 30 days post-hatching, the larvae reached the postflexion stage, measuring between 5.04~6.36 (5.76±0.51) mm in TL, with the tip of the caudal fin bent at 45°. After 54 days, the larvae had reached the juvenile stage, measuring between 7.43~9.84 (8.48±0.90) mm in TL, and were differentiated by their constant number of fins (6 first dorsal, 12 second dorsal, 11 anal, and 10 ventral fins). This study found that T. brevispinis had larger fertilized eggs and a greater number of myotomes in hatching larva than similar species. Additionally, the distribution of melanophores in T. brevispinis was distinct from that in other similar species, making it easy to distinguish them morphologically.

본 연구는 민물검정망둑의 초기생활사를 규명하고 그 특징을 근연종과 비교하여 분류학적 기초자료를 마련하고자 실시하였다. 수정란은 부착사를 가진 전구형으로 크기는 장경 1.30 mm, 단경 0.79 mm였다. 난발생은 수온 23.0~25.0℃에서 부화까지 167~228시간이 소요되었다. 부화 직후 난황자어는 전장 2.31~2.78 mm였고, 난황과 유구를 가지고 있었다. 부화 후 3일째는 전장 2.84~3.10 mm로 난황흡수가 완료되면서 전기자어로 이행하였다. 부화 후 19일째는 전장 4.02~4.62 mm로 꼬리지느러미 끝이 위쪽으로 휘어지면서 중기자어로 이행하였다. 부화 후 30일째는 전장 5.04~6.36 mm로 척추 끝 미부봉상골이 45°로 휘어지면서 후기자어로 이행하였다. 부화 후 54일째는 전장 7.43~9.84 mm로 기조 수가 각 부위별 지느러미 기조 수는 제1 등지느러미 6개, 제2등지느러미 12개, 뒷지느러미 11개, 배지느러미 10개로 정수에 달하면서 치어기로 이행하였다. 연구결과 민물검정망둑은 검정망둑속 가운데 수정란이 크고 부화자어의 근절 수가 많은 것을 새롭게 확인하였고, 흑색소포 분포위치는 검정망둑속 어류들과 다르게 나타나 형태적으로 쉽게 구분할 수 있었다.

Keywords

Acknowledgement

본 연구에 사용된 친어의 사진촬영에 도움을 주신 '한국의 물고기' 이건우 매니저님께 감사의 말씀을 드립니다.

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